BUBBLE DISTRIBUTION IN A TURBULENT PIPE FLOW Catherine Colin, Dominique Legendre, Jean Fabre
|
|
- Emerald Jennings
- 6 years ago
- Views:
Transcription
1 BUBBLE DISTRIBUTION IN A TURBULENT PIPE FLOW Catherine Colin, Dominique Legene, Jean Fabre Institut de Mécanique des Fluides de Toulouse, UMR 55 CNRS-INP/UPS Avenue du professeur Camille Soula 314 Toulouse, France Tel : (33) Fax : (33) colin@imft.fr ABSTRACT In the gas-liquid turbulent bubbly pipe flows, the prediction of the spatial distribution of the phases is crucial for the design of the thermohyaulic loops. This prediction remains difficult because of the coupled effects of the bubble ift velocity (due to gravity), the turbulence of the liquid phase, the dynamics of the bubbles and the vicinity of a wall. Up to now, no satisfactory model does exist, especially in micro gravity conditions. In order to analyse the role of the gravity and the turbulence of the liquid phase upon the bubbles distribution, experiments and numerical simulations are performed under normal gravity conditions and in micro gravity. They consist of a lagrangian tracking of single bubbles in a turbulent pipe flow. The experimental and numerical results show that, on earth, under the action of the lift force, the bubbles move radially towards the pipe wall in vertical upward flow, towards the pipe centre in downward flow. In micro gravity, in absence the ift velocity, the lift force vanishes. The action of the large turbulent eddies is dominant on the bubble dispersion and the radial bubble distribution is more homogeneous. INTRODUCTION In the gas liquid bubbly pipe flows, the spatial distribution of the phases controls the pressure op and the wall heat transfer, therefore its prediction is crucial for the design of the thermohyaulic loops. A research programme concerning the gas liquid pipe flows on earth and under micro gravity conditions is carried out at the Institut de Mécanique des Fluides de Toulouse (IMFT) with the support of the Centre National d Etudes Spatiales. One of the objectives of this programme concerns the prediction of the radial distribution of the bubbles in a gas-liquid turbulent bubbly pipe flow. Previous investigation (Colin et al., 1993 ; Kamp et al., 1995) of the local structure of a turbulent bubbly flow in a pipe of 4 cm diameter and 4 m long was carried out. Water was axially injected in the tube and the air bubbles were injected through 4 hypodermic needles of.34mm diameter. The superficial velocity of the liquid ranged between.3 and 1 m/s, the superficial velocity of gas up to.5 m/s and the bubble diameters between 1 and 4 mm. At.8 m from the bubble injection, the tube was equipped with local probes, which can be moved in a radial direction: - a single hot film probe for the measurements of the axial velocity of the liquid phase, - a double optical probe for the measurements of void fraction, bubble diameter and velocity. High-speed video pictures of the flow were also taken to determine the bubble size after image processing. Experiments were performed in the laboratory in vertical upward and downward flow and under micro gravity conditions during parabolic flights aboard the Caravelle and Airbus A3 Zero-G aircrafts. The radial distributions of the void fraction α, the axial mean velocities of the liquid U L and gas U G and the RMS velocities of the phases have been measured (Kamp, 1996). The main result is the strong influence of the gravity upon the void fraction distributions. On earth, the classical peak of void fraction near the wall in upward flow and the void coring effect in downward flow are observed. In micro gravity conditions, the radial distribution of the bubbles is rather flat with a maximum near the pipe centre (figure 1). The radial distribution of the bubbles is attributed to different effects: the lift force due to the ift velocity of the bubbles and the vorticity of the liquid flow, the action of the turbulence of the liquid phase and the bubble dynamics. The shape of the void fraction profiles can be analysed from the radial momentum balance equations of the liquid and the gas phases, written for a steady, quasi parallel flow. After elimination of the pressure gradient in the radial direction and considering that the turbulence of the liquid is homogeneous in the pipe section, the following equation is obtained (Kamp, 1996): d"! L v' L = M Gr +! L (1 # ") dv' L M Gr = 6 d F r [1] where v' L is the radial contribution to the turbulent kinetic energy and M Gr the density of interfacial momentum transfer in the radial direction, related to the total averaged force F r acting on the bubbles of diameter d in the radial direction. These different forces are detailed in the r.h.s. of the bubble dynamics equation [3]. In most of the eulerien models, the mean forces acting in the bubbles and the interfacial momentum transfer are expressed only versus the mean velocities of liquid and gas. Thus, in the expression of F r, only the lift force remains and equation [1] becomes:
2 d! v' L = (1"!) dv' L " 1 C L ( U G " U L ) du L [] where U L and U G are the axial components of the mean liquid and gas velocities plotted in figure. Equation [] can be used to predict the sign of dα/ and the qualitative shape of the void fraction distribution. The gradient of the mean liquid velocity being negative, the sign of the lift force is the same as this of the ift velocity U G - U L. It is positive in upward flow, negative in downward flow (figure ) and it follows that, for nearly spherical bubbles, the lift force pushes the bubbles towards the pipe wall in upward flow and towards the pipe centre in downward flow. The gradient of v' L in the radial direction is always positive, except very close to the wall, but its effect is smaller than this of the lift force. In micro gravity condition, the ift velocity is very close to zero and the mean lift force vanishes. Thus equation [] predict that the gradient of the void fraction is positive, which is not in agreement with the experimental results. The micro gravity experiments clearly pointed out the lacunae of the classical eulerien two-fluid models. In the laboratory experiments, the ift velocity is significant and the role of the turbulence on the bubble motion is often hidden by the forces due to the mean flow. On the other hand, in micro gravity, all the forces due to the mean flow vanish after averaging. Therefore, it is crucial to take into account the effect of the turbulence in the bubble dynamics equation ! U L 1.4 U G 1. (m / s) r/d r/d Figure 1: Void fraction distribution Figure : Radial distributions of U L, U G vertical upward flow, downward flow, microgravity flow, U G : open symbols, U L : closed symbols In order to analyse the role of the mean flow and the turbulence of the liquid phase on the bubble distribution, basic experiments and numerical simulations are performed on earth and also in micro gravity conditions. Both physical experiments and numerical simulations consist of the determination of the trajectory of single bubbles in a single-phase turbulent shear flow. In this basic situation, the single bubbles do not influence the turbulence of the liquid phase. EXPERIMENTAL DEVICE Experiments are carried out in a pipe of 4 mm diameter and 4 m long with the two-phase flow loop EDIA (figure 3). Water is circulated in a tube of 4 cm diameter and 4 m long by a centrifugal pump with a superficial velocity of 1 m/s. Spherical bubbles with diameter smaller than 1 mm are injected one at a time, through a small tube at the pipe centre, in the water flow. The bubbles are injected m downstream a turbulence grid located at the pipe inlet. A bubble injection device has been developed to inject bubbles with a constant size. The bubbles are created inside a box, at the outlet of an hypodermic needle of.15 mm dia. Water is injected in this box with a very low flow rate by a secondary pump and it carries the bubbles through a small tube to the centre of the pipe of 4 cm diameter. In that way, the bubble created in the box have a constant diameter of.9mm. Two synchronised high-speed video cameras located in two perpendicular plans take pictures of the bubbles downstream from the injection. After image processing, the three-dimensional trajectory of each bubble is rebuilt. The probability density function of the radial position of the bubbles can be obtained in different pipe sections downstream the bubble injection in order to be compared to the statistical results of the numerical simulations. Experiments are carried out in laboratory in vertical upward and downward flow. Micro gravity experiments have also been performed during a parabolic flights campaign aboard the Airbus A3 Zero G aircraft. Two different zones are investigated. Just downstream the injector, the bubbles are still in the central part of the pipe, where the mean velocity gradients are weak and the turbulence of the liquid phase nearly homogeneous. In this region a dispersion coefficient of the bubbles is estimated. A second zone at m from the bubble injector is also investigated. The radial distribution of the bubbles doesn t evolve anymore in the axial direction. The results are compared to the previous results of Kamp (1996) obtained with the injection of several bubbles.
3 Water circuit Visualising test section Light Cameras 4 cm dia. pipe tube Orifice Bubble extractor Pump Bubble injection device Valve Flow meter Box air Grid Motor EXPERIMENTAL RESULTS Figure 3: Experimental set-up A first set of experiments has been carried out in laboratory in vertical upward flow for a liquid superficial velocity of 1 m/s. Some measurements have been performed close to the injection at a distance z smaller than 15 R (R being the pipe radius). The radial distributions of the bubbles obtained after image processing, at different axial positions z, are plotted in figure 4. The bubbles are injected at the pipe centre, but quickly move toward the pipe wall under the effect of the turbulence and the lift force. The shape of the bubble distribution becomes larger as z increases due to the bubble dispersion by the turbulence. At z=1r, some bubbles have already reached the pipe wall.
4 1.5,5 1 z/r=8,5 1 z/r=1 z/r= r/r z/r=,5 z/r=,5 z/r=4,5 Figure 4 : Radial distributions of the bubbles of.9 mm diameter, at different distance z from the injection for a superficial liquid velocity j L =1m/s. The axial evolution of the mean radial position of the bubbles is plotted in Figure 5. It is compared to the trajectory of a single bubble of same diameter calculated from the dynamics equation for a spherical bubble:! G " b dv dt = (! G #! L )" b g + C D (Re b ) $d 8! L (u L # v) u L # v +! L " b (1+ C M ) Du [3] % L dv( # C &' Dt M dt )* +! L " b C L (u L # v) + (, + u L ) The r.h.s. of equation [3] are the different forces acting on a spherical bubble: buoyancy, ag, added mass and lift forces. u L and v are the instantaneous velocities of the liquid phase and the bubble, ρ G, ρ L are the densities of gas and liquid,! b is the bubble volume, d is the bubble diameter, C M is the virtual mass coefficient taken equal to 1/, C D is the ag coefficient function of the bubble Reynolds number Re b = u L! v d / " L (Mei et al., 1994), ν L the cinematic viscosity of the liquid. C L is a lift coefficient depending on both Re b and the shear rate (Legene and Magnaudet, 1998). This equation is valid for a bubble with a diameter smaller than the length scales of the flow inhomogeneity. By considering only the effect of the mean velocity of the liquid, the bubble motion in a steady, parallel, vertical shear flow can be calculated by the projections of equation [3] on the vertical (axial) and horizontal (radial) axis: C M dv r dt C M dv z dt = C L ( U L! V z ) du L = C L V r du L + 3C D 4d! 3C D 4d V r v ( U L! V z )v + g [4] V r and V z are the components of the mean bubble velocity in the horizontal and vertical directions. The trajectory of a bubble injected at 1 mm from the pipe axis is calculated from [4] and plotted in figure 5. The comparison with the measurements of the mean radial position of the bubbles, clearly points out that the mean radial motion of the bubbles is not only due to the mean velocity of the liquid. Then the turbulent velocities plays also an important role in the mean motion of the bubbles and have to be taken into account. The effect of the turbulence on the bubble dispersion has also been investigated. Although, the flow near the pipe centre of a tube of 4 cm for a Reynolds number of 4, is not very homogeneous and isotropic, we tried to estimate a dispersion coefficient of the bubbles in the radial direction and to compare it to the results of Spelt and Biesheuvel (1997) obtained by direct numerical simulations of bubble motions in homogenous isotropic turbulence. By analogy with the turbulent diffusion of fluid particles (Hinze, 1975), the dispersion coefficient of the bubbles in the radial direction D r can be calculated versus the mean square displacement of the bubbles in the radial directions r :
5 D r = 1 d dt r [6] For the long times, greater than the lagrangian integral time scale of the particle motion τ r the dispersion coefficient reaches a constant value, corresponding to a linear evolution of r with time (Hinze, 1975). For bubbles in an homogeneous, isotropic turbulence, Spelt (1996) and Spelt and Biesheuvel (1997) give an expression of the lagrangian integral time scale τ r and of the dispersion coefficient of the bubbles in the direction perpendicular to the bubble ift:! r = 1 " L # 1 + 4(! rel /µ) & % u $ 1+ 3(! rel / µ) ( D r = 1 ' "u L "u L )! rel, +. * µ - for " = u / V T << 1 and! rel µ with! rel = V T / g µ = / /V T V T = gd / L 361 L [7] u is the velocity scale of the turbulence, L is the eulerian integral length scale of turbulence, λ is the Taylor micro scale (Hinze, 1975), V T is the terminal velocity of the bubble, τ rel is the bubble relaxation time and µ is the interaction time between the bubble and a turbulent eddy of size λ. u, λ and L are estimated at the pipe centre from the measurement of the liquid velocity by hot film anemometry, for j L =1m/s. The different time, length and velocity scales are estimated for our experiment (Marino, ): u = 4cm / s V T = 7cm /s L = 4mm! = 1.8mm " rel = 14ms µ = 7ms " r # 1ms and D r # 9 $1 %6 m / s [8] The lagrangian integral time scale of the bubble motion in the radial direction τ r is about equal to 1 ms, then the bubble dispersion for the long time scales can be studied for a distance to the injection z greater than V z τ r = 1mm =.6R, V z being the vertical velocity of the bubble near the pipe centre. Experimentally, the dispersion coefficient is calculated from equation [6] using the data of the figure z /R 1 z /R r (mm) r (mm ) Figure 5: Mean radial positions of the bubbles ( ) Figure 6: Mean square of the bubble radial positions trajectory of a single bubble calculated from [5] For z/r between 1.5 and 5, the mean square of the bubble radial positions evolves quasi linearly with z. For greater values of z (>8R), the distribution of the radial positions of the bubbles becomes strongly asymmetrical (figure 4), the effect of the lift is dominant and the values of r increase a lot. Then the dispersion coefficient will be estimated from the data obtained for z/r < 5. The bubble vertical velocity V z being about equal to 1. m/s for 1.5 < z/r < 5, the dispersion coefficient can be estimated from the slope of the curve plotted in the figure 6 (Hinata et al., 198): D r = 1 V z d dz r! 6"1 #6 m /s [9] The value of the dispersion coefficient of the bubbles determined from the experimental data is very close to the value [8] estimated from the expression of Spelt and Biesheuvel (equation [7]). Consequently, close to the injection, where
6 the bubbles are present in the central part of the pipe and where the effect of the lift force is not dominant, their radial dispersion by the turbulence is well predicted by the theory developed for the homogeneous, isotropic turbulence. In vertical upward flow, the radial repartition of the bubbles has also been determined from the statistics of 4 bubbles trajectories, at a distance z=1r from the injection. From this distance the bubble distribution is established. In the figure 8, the bubble distribution (dashed line) is compared to the void fraction distribution (white squares) measured at the same velocity j L =1m/s and for a mean void fraction of %. The shapes of these two distributions are very similar in spite of the different the bubble sizes. They display a sharp peak near the wall and an absence of bubbles near the pipe centre. This comparison is very promising, and it seems reasonable to study the mechanism of the void fraction distribution, at low void fraction, by analysing the dynamics of isolated bubbles. NUMERICAL SIMULATIONS The numerical simulations are performed with the code JADIM, allowing Large Eddy Simulations of the turbulence (Calmet & Magnaudet, 1997) and a lagrangian tracking of particles (Climent & Magnaudet, 1997). The local instantaneous characteristics of a wall turbulent shear flow are obtained by LES with a great accuracy (close to that obtained with Direct Numerical Simulations) for Reynolds number up to 4,. The trajectory of isolated spherical bubbles can be computed by using equation [3]. The instantaneous velocity u L of a turbulent liquid flow is computed for a D geometry by the code JADIM, the bubble velocity v is calculated from equation [3] and the instantaneous trajectories of single bubbles are obtained after integration of the velocity v. The probability density function of the radial repartition of the bubbles can be deduced from a statistical analysis of the instantaneous trajectories and compared to the experimental data. The first results of the numerical simulations performed for bubbles of.5 mm diameter (Legene et al., 1999) confirm the tendencies experimentally observed (figure 7). Under the action of the lift force, the bubbles move radially towards the pipe wall in vertical upward flow (-1g), towards the pipe centre in downward flow (1g). In micro gravity (g), in absence of a ift velocity, the lift force vanishes. The action of the large turbulent eddies is dominant on the bubble dispersion and the radial bubble distribution is more homogeneous. The trajectories of the bubbles between z=6 R and z=1r are used to calculate the probability density function of the radial positions of the bubbles. In figure 8 these dimensionless radial distributions ( for bubbles of.5 mm diameter) computed for upward, downward and micro gravity flows are compared to the dimensionless void fraction distributions measured by Kamp (1996) with the same superficial velocity (j L =1m/s), but with simultaneous injection of several bubbles at low void fraction α=%. The divergence between the numerical simulations and the experiments can be attributed to different factors. Only 1 bubble trajectories have been computed and the convergence of the results is not certain. Furthermore, the bubble sizes are different:.5 mm in the numerical simulations and 3 to 4 mm in the upward and downward flow experiments, then the bubble ift velocity is smaller in the numerical simulations and the effect of the lift force weaker. The interactions between the bubbles and the turbulent eddies are also different for bubbles of different sizes. On the other hand, in micro gravity, the numerical simulations are qualitatively in good agreement with the experiments of Kamp performed with bubbles of 1. mm diameter. The bubble motion is controlled by the instantaneous added mass force (third term of the r.h.s. of equation [3]), taking into account the temporal variations of the turbulent structures.
7 (-1g) (1g) (g) Figure 7: Computed trajectories of bubbles of.5 mm diameter in a turbulent channel flow (h= cm, Re=4,) in vertical upward flow (- 1g), downward flow (1g) and microgravity flow (g). 8 pdf 6 pdf pdf (-1g) (1g) (g) r/r r/r r/r Figure 8: Comparison of the probability density function of the radial positions of the bubbles and the dimensionless void fraction profiles for Re=4,: numerical simulation (d=.5 mm)- - - experimental results (d=.9mm) experimental results of Kamp (α=%) : vertical upward flow, downward flow, microgravity flow
8 CONCLUSION In most of the eulerian models, used for the dispersed flow computation, the interfacial momentum transfer (including the forces acting on the bubbles) is modelised from the mean velocity fields, the effect of the turbulent velocities being not taken into account. Some discrepancies are then observed between the radial bubble distributions measured in a pipe flow and the predictions of these models, especially in micro gravity. To point out the effects of the mean velocity field and of the turbulence on the bubble motion, some experiments and numerical simulations on the dynamics of isolated bubbles have been carried out. The three dimensional trajectory of each bubble injected at the pipe centre, has been determined and the statistical distributions of the radial positions of the bubbles have been calculated. The first experiments performed in vertical upward flow, show that near the bubble injection point, the radial dispersion of the bubbles is similar to this observed in homogeneous isotropic turbulence. On the other hand, the mean motion of the bubbles is not well predicted by a bubble dynamics equation based on the mean velocity field. At a distance of 1R from the bubble injection, the statistical distribution of the bubbles is quite the same as the void fraction distribution measured in bubbly flow at low void fraction. Therefore, the statistical analysis of the dynamics of single bubbles is pertinent to study the void fraction distribution in bubbly flows at low void fraction. The first results of the numerical simulations are very promising. They point out the importance of the instantaneous characteristics of the turbulence upon the bubble dynamics. This aspect should be taken into account in the modelling of the interfacial momentum transfer (including the forces acting on the bubbles) in the eulerian models. Then, the prediction of the bubble radial distribution should be improved, especially in micro gravity where the bubbleturbulence interactions control this distribution. BIBLIOGRAPHY CALMET I., MAGNAUDET J., Large Eddy Simulation of high-schmidt number mass transfer in a turbulent channel flow, Phys. Fluids 9 (), CLIMENT E., MAGNAUDET J., Simulation d écoulements induits par des bulles dans un liquide initialement au repos, C.R. Acad. Sci. Paris, t. 34, Série II b, COLIN C., KAMP A. & FABRE J., Influence of gravity on void and velocity distribution in two-phase gas-liquid flow in pipe, Adv. Space Res., 13, 7, , HINATA S., KUGA O., KOBAYASI K., Diffusion of bubbles in two phase flow, second report : diffusion of a single bubble and eddy diffusivity of heat in single phase turbulent flow, bulletin of the JSME,, No.164, HINZE J.O., Turbulence, Mc Graw Hill, Second Edition, KAMP A., COLIN C. & FABRE J., The local structure of a turbulent bubbly pipe flow under different gravity conditions, nd International Conference on Multiphase Flow, Kyoto (Japan), April 3-7, KAMP A., Ecoulement turbulent à bulles dans une conduite en micropesanteur, Thèse INPT, LEGENDRE D., MAGNAUDET J., The lift force on a spherical bubble in a viscous linear shear flow, J. Fluid Mech., 368, pp 81-16, LEGENDRE D., COLIN C., FABRE J., MAGNAUDET J., Influence of gravity upon the bubble distribution in a turbulent pipe flow: comparison between numerical simulations and experimental data, Journal de Chimie Physique, 96, , MARINO D., Etude du mouvement de bulles isolées dans un écoulement turbulent en tube, DEA INP Toulouse,. MEI R., LAWRENCE C.J., ADRIAN R.J., Unsteady ag on a sphere at finite Reynolds number with small amplitude fluctuations in the free stream velocity, Phys. of Fluids, 6, pp 418-4, SPELT P.D.M., The motion of bubbles in a turbulent flow, PhD thesis University of Twente, SPELT P.D.M., BIESHEUVEL A., On the motion of gas bubbles in homogeneous isotropic turbulence, J. Fluid Mech, 336, pp.1-44, 1997.
Investigation of momentum exchange term closures for the Eulerian-Eulerian model applied to bubbly flows
Graduate Theses and Dissertations Iowa State University Capstones, Theses and Dissertations 2016 Investigation of momentum exchange term closures for the Eulerian-Eulerian model applied to bubbly flows
More informationNumerical Simulations of a Train of Air Bubbles Rising Through Stagnant Water
Numerical Simulations of a Train of Air Bubbles Rising Through Stagnant Water Hong Xu, Chokri Guetari ANSYS INC. Abstract Transient numerical simulations of the rise of a train of gas bubbles in a liquid
More informationLarge-eddy simulation of a turbulent buoyant helium plume
Center for Turbulence Research Annual Research Briefs 8 45 Large-eddy simulation of a turbulent buoyant helium plume By G. Blanquart AND H. Pitsch. Motivation and objectives The numerical simulation of
More informationInfluence of rounding corners on unsteady flow and heat transfer around a square cylinder
Influence of rounding corners on unsteady flow and heat transfer around a square cylinder S. K. Singh Deptt. of Mech. Engg., M. B. M. Engg. College / J. N. V. University, Jodhpur, Rajasthan, India Abstract
More informationNumerical Analysis of Two Phase Flow Patterns in Vertical and Horizontal Pipes
Numerical Analysis of Two Phase Flow Patterns in Vertical and Horizontal Pipes MOHAMMED A. ABDULWAHID, HASANAIN J. KAREEM, MUJTABA A. ALMUDHAFFAR Thermal Mechanical Engineering, Southern Technical University,
More informationFree Surface Flow Simulation with ACUSIM in the Water Industry
Free Surface Flow Simulation with ACUSIM in the Water Industry Tuan Ta Research Scientist, Innovation, Thames Water Kempton Water Treatment Works, Innovation, Feltham Hill Road, Hanworth, TW13 6XH, UK.
More informationThe effect of back spin on a table tennis ball moving in a viscous fluid.
How can planes fly? The phenomenon of lift can be produced in an ideal (non-viscous) fluid by the addition of a free vortex (circulation) around a cylinder in a rectilinear flow stream. This is known as
More informationExperimental study on path instability of rising bubbles
Experimental study on path instability of rising bubbles V. MOTURI, D. FUNFSCHILLING, J. DUSEK ICube, UMR 7357 Mécanique des fluids,2 rue Boussingault,67000,Strasbourg,France. viswa-maitreyi.moturi@etu.unistra.fr
More informationON THE EFFECT OF LIFT FORCES IN BUBBLE PLUMES
Ninth International Conference on CFD in the Minerals and Process Industries CSIRO, Melbourne, Australia 10-12 December 2012 ON THE EFFECT OF LIFT FORCES IN BUBBLE PLUMES Jan Erik OLSEN* and Mihaela POPESCU
More informationACCURACY AND FEASIBILITY OF BUBBLE DYNAMIC MEASUREMENTS WITH FOUR-POINT OPTICAL FIBER PROBES
ACCURACY AND FEASIBILITY OF BUBBLE DYNAMIC MEASUREMENTS WITH FOUR-POINT OPTICAL FIBER PROBES R.V. Fortunati *1, S. Guet 1, G.Ooms 1, R.V.A. Oliemans 2 and R.F. Mudde 2 1 J.M. Burgerscentrum, Delft University
More informationNumerical simulation of an intermediate sized bubble rising in a vertical pipe
Computational Methods in Multiphase Flow V 111 Numerical simulation of an intermediate sized bubble rising in a vertical pipe J. Hua 1, S. Quan 2 & J. Nossen 1 1 Department of Process and Fluid Flow Technology,
More informationBioreactor System ERT 314. Sidang /2011
Bioreactor System ERT 314 Sidang 1 2010/2011 Chapter 2:Types of Bioreactors Week 4 Flow Patterns in Agitated Tanks The flow pattern in an agitated tank depends on the impeller design, the properties of
More informationA numerical Euler-Lagrange method for bubble tower CO2 dissolution modeling
A numerical Euler-Lagrange method for bubble tower CO2 dissolution modeling Author: Daniel Legendre & Prof. Ron Zevenhoven Åbo Akademi University Thermal and Flow Engineering Laboratory Turku, Finland
More informationForest Winds in Complex Terrain
Forest Winds in Complex Terrain Ilda Albuquerque 1 Contents Project Description Motivation Forest Complex Terrain Forested Complex Terrain 2 Project Description WAUDIT (Wind Resource Assessment Audit and
More informationPressure Drop of Two-Phase Flow Through Horizontal Channel with Smooth Expansion
Purdue University Purdue e-pubs International Refrigeration and Air Conditioning Conference School of Mechanical Engineering 2012 Pressure Drop of Two-Phase Flow Through Horizontal Channel with Smooth
More informationNumerical Simulations of Liquid-Gas- Solid Three-Phase Flows in Microgravity
Numerical Simulations of Liquid-Gas- Solid Three-Phase Flows in Microgravity Xinyu Zhang and Goodarz Ahmadi* Department of Mechanical and Aeronautical Engineering, Clarkson University, Potsdam, N.Y. 13699
More informationSimulation of Gas Holdup in a Bubble Column with a Draft Tube for Gas Dispersion into an Annulus
Simulation of Gas Holdup in a Bubble Column with a Draft Tube for Gas Dispersion into an Annulus Fukuji Yamashita Dept. of Applied Bioscience, Kanagawa Institute of Technology, Atsugi 243-292, Japan, yamasita@bio.kanagawa-it.ac.jp
More informationINTERACTION BETWEEN WIND-DRIVEN AND BUOYANCY-DRIVEN NATURAL VENTILATION Bo Wang, Foster and Partners, London, UK
INTERACTION BETWEEN WIND-DRIVEN AND BUOYANCY-DRIVEN NATURAL VENTILATION Bo Wang, Foster and Partners, London, UK ABSTRACT Ventilation stacks are becoming increasingly common in the design of naturally
More informationThe Mechanism Study of Vortex Tools Drainage Gas Recovery of Gas Well
Advances in Petroleum Exploration and Development Vol. 7, No. 1, 214, pp. 62-66 DOI:1.3968/j.aped.1925543821471.1931 ISSN 1925-542X [Print] ISSN 1925-5438 [Online] www.cscanada.net www.cscanada.org The
More informationWorkshop 1: Bubbly Flow in a Rectangular Bubble Column. Multiphase Flow Modeling In ANSYS CFX Release ANSYS, Inc. WS1-1 Release 14.
Workshop 1: Bubbly Flow in a Rectangular Bubble Column 14. 5 Release Multiphase Flow Modeling In ANSYS CFX 2013 ANSYS, Inc. WS1-1 Release 14.5 Introduction This workshop models the dispersion of air bubbles
More informationModeling Turbulent Entrainment of Air at a Free Surface C.W. Hirt 5/24/12 Flow Science, Inc.
Flow Science Report 01-12 Modeling Turbulent Entrainment of Air at a Free Surface C.W. Hirt 5/24/12 Flow Science, Inc. Overview In free-surface flows the turbulence in the liquid may be sufficient to disturb
More informationInvestigation of Suction Process of Scroll Compressors
Purdue University Purdue e-pubs International Compressor Engineering Conference School of Mechanical Engineering 2006 Investigation of Suction Process of Scroll Compressors Michael M. Cui Trane Jack Sauls
More informationSome Geometric and Kinematics Properties of Breaking Waves
Some Geometric and Kinematics Properties of Breaking Waves Pierre Bonmarin Institut de Recherche sur les Phénomènes Hors Equilibre (IRPHE), Laboratoire IOA, 163 Avenue de Luminy, Case 903, 13288 Marseilles,
More informationFlow transients in multiphase pipelines
Flow transients in multiphase pipelines David Wiszniewski School of Mechanical Engineering, University of Western Australia Prof. Ole Jørgen Nydal Multiphase Flow Laboratory, Norwegian University of Science
More informationFlow and Mixing in the Liquid between Bubbles
Excerpt from the Proceedings of the COMSOL Conference 2009 Boston Flow and Mixing in the Liquid between Bubbles Bruce A. Finlayson, Professor Emeritus of Chemical Engineering Department of Chemical Engineering,
More informationTHEORETICAL EVALUATION OF FLOW THROUGH CENTRIFUGAL COMPRESSOR STAGE
THEORETICAL EVALUATION OF FLOW THROUGH CENTRIFUGAL COMPRESSOR STAGE S.Ramamurthy 1, R.Rajendran 1, R. S. Dileep Kumar 2 1 Scientist, Propulsion Division, National Aerospace Laboratories, Bangalore-560017,ramamurthy_srm@yahoo.com
More informationKinematics of Vorticity
Kinematics of Vorticity Vorticity Ω Ω= V 2 circumferentially averaged angular velocity of the fluid particles Sum of rotation rates of perpendicular fluid lines Non-zero vorticity doesn t imply spin.ω=0.
More informationEffects of turbulence on the drag force on a golf ball
European Journal of Physics PAPER Effects of turbulence on the drag force on a golf ball To cite this article: Rod Cross 2016 Eur. J. Phys. 37 054001 View the article online for updates and enhancements.
More informationAIRFLOW GENERATION IN A TUNNEL USING A SACCARDO VENTILATION SYSTEM AGAINST THE BUOYANCY EFFECT PRODUCED BY A FIRE
- 247 - AIRFLOW GENERATION IN A TUNNEL USING A SACCARDO VENTILATION SYSTEM AGAINST THE BUOYANCY EFFECT PRODUCED BY A FIRE J D Castro a, C W Pope a and R D Matthews b a Mott MacDonald Ltd, St Anne House,
More informationEnergy and mass transfer in gas-liquid reactors.
Energy and mass transfer in gas-liquid reactors. John M Smith School of Engineering (D2) University of Surrey, Guildford GU2 7XH, UK j.smith@surrey.ac.uk 1 Energy and mass transfer in gas-liquid reactors.
More informationTHREE DIMENSIONAL STRUCTURES OF FLOW BEHIND A
The Seventh Asia-Pacific Conference on Wind Engineering, November 8-12, 29, Taipei, Taiwan THREE DIMENSIONAL STRUCTURES OF FLOW BEHIND A SQUARE PRISM Hiromasa Kawai 1, Yasuo Okuda 2 and Masamiki Ohashi
More informationInternational Journal of Technical Research and Applications e-issn: , Volume 4, Issue 3 (May-June, 2016), PP.
DESIGN AND ANALYSIS OF FEED CHECK VALVE AS CONTROL VALVE USING CFD SOFTWARE R.Nikhil M.Tech Student Industrial & Production Engineering National Institute of Engineering Mysuru, Karnataka, India -570008
More informationThe water supply for a hydroelectric plant is a reservoir with a large surface area. An outlet pipe takes the water to a turbine.
Fluids 1a. [1 mark] The water supply for a hydroelectric plant is a reservoir with a large surface area. An outlet pipe takes the water to a turbine. State the difference in terms of the velocity of the
More informationSound scattering by hydrodynamic wakes of sea animals
ICES Journal of Marine Science, 53: 377 381. 1996 Sound scattering by hydrodynamic wakes of sea animals Dmitry A. Selivanovsky and Alexander B. Ezersky Selivanovsky, D. A. and Ezersky, A. B. 1996. Sound
More informationCOMPUTATIONAL FLOW MODEL OF WESTFALL'S LEADING TAB FLOW CONDITIONER AGM-09-R-08 Rev. B. By Kimbal A. Hall, PE
COMPUTATIONAL FLOW MODEL OF WESTFALL'S LEADING TAB FLOW CONDITIONER AGM-09-R-08 Rev. B By Kimbal A. Hall, PE Submitted to: WESTFALL MANUFACTURING COMPANY September 2009 ALDEN RESEARCH LABORATORY, INC.
More informationMODELING AND SIMULATION OF VALVE COEFFICIENTS AND CAVITATION CHARACTERISTICS IN A BALL VALVE
Proceedings of the 37 th International & 4 th National Conference on Fluid Mechanics and Fluid Power FMFP2010 December 16-18, 2010, IIT Madras, Chennai, India FMFP2010 341 MODELING AND SIMULATION OF VALVE
More informationComputer Simulation Helps Improve Vertical Column Induced Gas Flotation (IGF) System
JOURNAL ARTICLES BY FLUENT SOFTWARE USERS JA187 Computer Simulation Helps Improve Vertical Column Induced Gas Flotation (IGF) System Computer simulation has helped NATCO engineers make dramatic improvements
More informationPhD student, January 2010-December 2013
Numerical modeling of wave current interactions ata a local scaleand and studyof turbulence closuremodel effects MARIA JOÃO TELES PhD student, January 2010-December 2013 Supervisor: António Pires-Silva,
More informationAerodynamic Analyses of Horizontal Axis Wind Turbine By Different Blade Airfoil Using Computer Program
ISSN : 2250-3021 Aerodynamic Analyses of Horizontal Axis Wind Turbine By Different Blade Airfoil Using Computer Program ARVIND SINGH RATHORE 1, SIRAJ AHMED 2 1 (Department of Mechanical Engineering Maulana
More informationDynamics of bubble rising at small Reynolds numbers
MATEC Web of Conferences 3, 01004 ( 015) DOI: 10.1051/ matecconf/ 015301004 C Owned by the authors, published by EDP Sciences, 015 Dynamics of bubble rising at small Reynolds numbers Vladimir Arkhipov
More informationISOLATION OF NON-HYDROSTATIC REGIONS WITHIN A BASIN
ISOLATION OF NON-HYDROSTATIC REGIONS WITHIN A BASIN Bridget M. Wadzuk 1 (Member, ASCE) and Ben R. Hodges 2 (Member, ASCE) ABSTRACT Modeling of dynamic pressure appears necessary to achieve a more robust
More informationStudy on the Influencing Factors of Gas Mixing Length in Nitrogen Displacement of Gas Pipeline Kun Huang 1,a Yan Xian 2,b Kunrong Shen 3,c
Applied Mechanics and Materials Online: 2013-06-13 ISSN: 1662-7482, Vols. 321-324, pp 299-304 doi:10.4028/www.scientific.net/amm.321-324.299 2013 Trans Tech Publications, Switzerland Study on the Influencing
More informationA Computational Assessment of Gas Jets in a Bubbly Co-Flow 1
A Computational Assessment of Gas Jets in a Bubbly Co-Flow 1 Melissa Fronzeo*, 1 Michael Kinzel 1 The Pennsylvania State University, University Park, PA, USA Abstract In this effort, Computational Fluid
More informationIMAGE-BASED STUDY OF BREAKING AND BROKEN WAVE CHARACTERISTICS IN FRONT OF THE SEAWALL
IMAGE-BASED STUDY OF BREAKING AND BROKEN WAVE CHARACTERISTICS IN FRONT OF THE SEAWALL Weijie Liu 1 and Yoshimitsu Tajima 1 This study aims to study the breaking and broken wave characteristics in front
More informationThe Study of Bubbly Gas-Water Flow Using
The Study of Bubbly Gas-Water Flow Using Displacement Current Phase Tomography Chris Zuccarelli 1, Benjamin Straiton 1, Joshua Sines 1, Qussai Marashdeh 1 1 Tech4Imaging, 1910 Crown Park Court, Columbus,
More informationControl of Air Bubble Cluster by a Vortex Ring Launched into Still Water
International Journal of Chemical Engineering and Applications, Vol. 8, No. 1, February 2017 Control of Air Bubble Cluster by a Vortex Ring Launched into Still Water Tomomi Uchiyama and Sou Kusamichi performed
More informationQuantification of the Effects of Turbulence in Wind on the Flutter Stability of Suspension Bridges
Quantification of the Effects of Turbulence in Wind on the Flutter Stability of Suspension Bridges T. Abbas 1 and G. Morgenthal 2 1 PhD candidate, Graduate College 1462, Department of Civil Engineering,
More informationAn innovative technology for Coriolis metering under entrained gas conditions
An innovative technology for Coriolis metering under entrained gas conditions Coriolis mass flowmeters are usually only used for single-phase fluids, i.e. either liquids or gases, since it has been found
More informationAn experimental study of internal wave generation through evanescent regions
An experimental study of internal wave generation through evanescent regions Allison Lee, Julie Crockett Department of Mechanical Engineering Brigham Young University Abstract Internal waves are a complex
More informationWind tunnel effects on wingtip vortices
48th AIAA Aerospace Sciences Meeting Including the New Horizons Forum and Aerospace Exposition 4-7 January 2010, Orlando, Florida AIAA 2010-325 Wind tunnel effects on wingtip vortices Xin Huang 1, Hirofumi
More informationA. M. Dalavi, Mahesh Jadhav, Yasin Shaikh, Avinash Patil (Department of Mechanical Engineering, Symbiosis Institute of Technology, India)
IOSR Journal of Mechanical and Civil Engineering (IOSR-JMCE) ISSN(e) : 2278-1684, ISSN(p) : 2320 334X, PP : 45-49 www.iosrjournals.org Modeling, Optimization & Manufacturing of Vortex Tube and Application
More informationUse a Controlled Vibration to Mixing and Separation of a Gas Bubbles and a Liquid Under Reduced and Microgravity Conditions
ng & Process Technology rijournal of Chemical Enginee Research Article Article Journal of Chemical Engineering & Process Technology Shoikhedbrod, J Chem Eng Process Technol 2016, 7:4 DOI: 10.4172/2157-7048.1000305
More informationAE Dept., KFUPM. Dr. Abdullah M. Al-Garni. Fuel Economy. Emissions Maximum Speed Acceleration Directional Stability Stability.
Aerodynamics: Introduction Aerodynamics deals with the motion of objects in air. These objects can be airplanes, missiles or road vehicles. The Table below summarizes the aspects of vehicle performance
More informationLOW PRESSURE EFFUSION OF GASES adapted by Luke Hanley and Mike Trenary
ADH 1/7/014 LOW PRESSURE EFFUSION OF GASES adapted by Luke Hanley and Mike Trenary This experiment will introduce you to the kinetic properties of low-pressure gases. You will make observations on the
More informationThe Discussion of this exercise covers the following points:
Exercise 3-2 Orifice Plates EXERCISE OBJECTIVE In this exercise, you will study how differential pressure flowmeters operate. You will describe the relationship between the flow rate and the pressure drop
More informationLift for a Finite Wing. all real wings are finite in span (airfoils are considered as infinite in the span)
Lift for a Finite Wing all real wings are finite in span (airfoils are considered as infinite in the span) The lift coefficient differs from that of an airfoil because there are strong vortices produced
More information10.6 The Dynamics of Drainage Flows Developed on a Low Angle Slope in a Large Valley Sharon Zhong 1 and C. David Whiteman 2
10.6 The Dynamics of Drainage Flows Developed on a Low Angle Slope in a Large Valley Sharon Zhong 1 and C. David Whiteman 2 1Department of Geosciences, University of Houston, Houston, TX 2Pacific Northwest
More informationMeasurement and simulation of the flow field around a triangular lattice meteorological mast
Measurement and simulation of the flow field around a triangular lattice meteorological mast Matthew Stickland 1, Thomas Scanlon 1, Sylvie Fabre 1, Andrew Oldroyd 2 and Detlef Kindler 3 1. Department of
More informationMeasurement of both gas and liquid velocity profiles for bubble-induced turbulent flow
Measurement of both gas and liquid velocity profiles for bubble-induced turbulent flow H. Takiguchi 1*, M. Furuya 1, T. Arai 1, T. Kanai 1 1: Central research institute of electric power industry (CRIEPI)
More informationNumerical Investigation of Air Bubbles Evolution and Coalescence from Submerged Orifices Based on OpenFOAM
Numerical Investigation of Air Bubbles Evolution and Coalescence from Submerged Orifices Based on OpenFOAM Pan Feng, He Ying, Li-zhong Mu 2018-7-6 Dalian University of Technology, China Outline Background
More informationInjector Dynamics Assumptions and their Impact on Predicting Cavitation and Performance
Injector Dynamics Assumptions and their Impact on Predicting Cavitation and Performance Frank Husmeier, Cummins Fuel Systems Presented by Laz Foley, ANSYS Outline Overview Computational Domain and Boundary
More informationMODELING OF THERMAL BEHAVIOR INSIDE A BUBBLE
CAV2001:sessionB6.002 1 MODEING OF THERMA BEHAVIOR INSIDE A BUBBE Boonchai ERTNUWAT *, Kazuyasu SUGIYAMA ** and Yoichiro MATSUMOTO *** *, ***Dept. of Mechanical Engineering, The University of Tokyo, Tokyo,
More informationErmenek Dam and HEPP: Spillway Test & 3D Numeric-Hydraulic Analysis of Jet Collision
Ermenek Dam and HEPP: Spillway Test & 3D Numeric-Hydraulic Analysis of Jet Collision J.Linortner & R.Faber Pöyry Energy GmbH, Turkey-Austria E.Üzücek & T.Dinçergök General Directorate of State Hydraulic
More informationAerodynamic Analysis of a Symmetric Aerofoil
214 IJEDR Volume 2, Issue 4 ISSN: 2321-9939 Aerodynamic Analysis of a Symmetric Aerofoil Narayan U Rathod Department of Mechanical Engineering, BMS college of Engineering, Bangalore, India Abstract - The
More information3D Simulation and Validation of a Lab Scale Bubble Column
1639 A publication of VOL. 43, 2015 CHEMICAL ENGINEERING TRANSACTIONS Chief Editors: Sauro Pierucci, Jiří J. Klemeš Copyright 2015, AIDIC Servizi S.r.l., ISBN 978-88-95608-34-1; ISSN 2283-9216 The Italian
More informationComputational Analysis of Oil Spill in Shallow Water due to Wave and Tidal Motion Madhu Agrawal Durai Dakshinamoorthy
Computational Analysis of Oil Spill in Shallow Water due to Wave and Tidal Motion Madhu Agrawal Durai Dakshinamoorthy 1 OUTLINE Overview of Oil Spill & its Impact Technical Challenges for Modeling Review
More informationEFFECT OF CORNER CUTOFFS ON FLOW CHARACTERISTICS AROUND A SQUARE CYLINDER
EFFECT OF CORNER CUTOFFS ON FLOW CHARACTERISTICS AROUND A SQUARE CYLINDER Yoichi Yamagishi 1, Shigeo Kimura 1, Makoto Oki 2 and Chisa Hatayama 3 ABSTRACT It is known that for a square cylinder subjected
More informationDevelopment of Fluid-Structure Interaction Program for the Mercury Target
Chapter 4 Epoch Making Simulation Development of Fluid-Structure Interaction Program for the Mercury Target Project Representative Chuichi Arakawa Authors Chuichi Arakawa Takuma Kano Ryuta Imai Japan Atomic
More informationNumerical Simulations of Bubbling Fluidized Beds
Numerical Simulations of Bubbling Fluidized Beds A. Busciglio, G. Micale, L.Rizzuti, G. Vella. Università degli Studi di Palermo Dipartimento di Ingegneria Chimica dei Processi e dei Materiali Viale delle
More informationUnsteady Aerodynamics of Tandem Airfoils Pitching in Phase
Unsteady Aerodynamics of Tandem Airfoils Pitching in Phase Ravindra A Shirsath and Rinku Mukherjee Abstract This paper presents the results of a numerical simulation of unsteady, incompressible and viscous
More informationEffect of 180 bends on gas/liquid flows in vertical upward and downward pipes
Computational Methods in Multiphase Flow VII 435 Effect of 180 bends on gas/liquid flows in vertical upward and downward pipes A. Almabrok, L. Lao & H. Yeung Department of Offshore, Process and Energy
More informationEDUCTOR. principle of operation
EDUCTOR principle of operation condensate and mixing eductor s are designed to mix two liquids intimately in various proportions in operations where the pressure liquid is the greater proportion of the
More information9 Mixing. I Fundamental relations and definitions. Milan Jahoda revision Radim Petříček, Lukáš Valenz
9 ixing ilan Jahoda revision 14-7-017 Radim Petříček, Lukáš Valenz I Fundamental relations and definitions ixing is a hydrodynamic process, in which different methods are used to bring about motion of
More informationSIMULATIONS OF HYDROGEN RELEASES FROM A STORAGE TANKS: DISPERSION AND CONSEQUENCES OF IGNITION
SIMULATIONS OF HYDROGEN RELEASES FROM A STORAGE TANKS: DISPERSION AND CONSEQUENCES OF IGNITION Angers, B. 1, Hourri, A. 1, Bénard, P. 1, Tessier, P. 2 and Perrin, J. 3 1 Hydrogen Research Institute, Université
More information3. Observed initial growth of short waves from radar measurements in tanks (Larson and Wright, 1975). The dependence of the exponential amplification
Geophysica (1997), 33(2), 9-14 Laboratory Measurements of Stress Modulation by Wave Groups M.G. Skafel and M.A. Donelan* National Water Research Institute Canada Centre for Inland Waters Burlington, Ontario,
More informationZIN Technologies PHi Engineering Support. PHi-RPT CFD Analysis of Large Bubble Mixing. June 26, 2006
ZIN Technologies PHi Engineering Support PHi-RPT-0002 CFD Analysis of Large Bubble Mixing Proprietary ZIN Technologies, Inc. For nearly five decades, ZIN Technologies has provided integrated products and
More informationSimulations for Microbubble Drag Reduction (MBDR) at High Reynolds Numbers
Simulations for Microbubble Drag Reduction (MBDR) at High Reynolds Numbers M.R. Maxey, S. Dong, J. Xu, and G.E. Karniadakis Division of Applied Mathematics, Brown University, Providence, RI maxey@cfm.brown.edu
More informationMeasurements of the Average Properties of a Suspension of Bubbles Rising in a Vertical Channel
Syracuse University SURFACE Biomedical and Chemical Engineering College of Engineering and Computer Science 1-1-2001 Measurements of the Average Properties of a Suspension of Bubbles Rising in a Vertical
More informationExperimental Investigation Of Flow Past A Rough Surfaced Cylinder
(AET- 29th March 214) RESEARCH ARTICLE OPEN ACCESS Experimental Investigation Of Flow Past A Rough Surfaced Cylinder Monalisa Mallick 1, A. Kumar 2 1 (Department of Civil Engineering, National Institute
More informationApplied Fluid Mechanics
Applied Fluid Mechanics 1. The Nature of Fluid and the Study of Fluid Mechanics 2. Viscosity of Fluid 3. Pressure Measurement 4. Forces Due to Static Fluid 5. Buoyancy and Stability 6. Flow of Fluid and
More informationKeywords: dynamic stall, free stream turbulence, pitching airfoil
Applied Mechanics and Materials Vol. 225 (2012) pp 103-108 Online available since 2012/Nov/29 at www.scientific.net (2012) Trans Tech Publications, Switzerland doi:10.4028/www.scientific.net/amm.225.103
More informationMicro Channel Recuperator for a Reverse Brayton Cycle Cryocooler
Micro Channel Recuperator for a Reverse Brayton Cycle Cryocooler C. Becnel, J. Lagrone, and K. Kelly Mezzo Technologies Baton Rouge, LA USA 70806 ABSTRACT The Missile Defense Agency has supported a research
More informationIrrigation &Hydraulics Department lb / ft to kg/lit.
CAIRO UNIVERSITY FLUID MECHANICS Faculty of Engineering nd Year CIVIL ENG. Irrigation &Hydraulics Department 010-011 1. FLUID PROPERTIES 1. Identify the dimensions and units for the following engineering
More informationLOW PRESSURE EFFUSION OF GASES revised by Igor Bolotin 03/05/12
LOW PRESSURE EFFUSION OF GASES revised by Igor Bolotin 03/05/ This experiment will introduce you to the kinetic properties of low-pressure gases. You will make observations on the rates with which selected
More informationEXPERIMENTAL ANALYSIS OF THE CONFLUENT BOUNDARY LAYER BETWEEN A FLAP AND A MAIN ELEMENT WITH SAW-TOOTHED TRAILING EDGE
24 TH INTERNATIONAL CONGRESS OF THE AERONAUTICAL SCIENCES EXPERIMENTAL ANALYSIS OF THE CONFLUENT BOUNDARY LAYER BETWEEN A FLAP AND A MAIN ELEMENT WITH SAW-TOOTHED TRAILING EDGE Lemes, Rodrigo Cristian,
More informationFORMATION AND DEVELOPMENT OF SUBMERGED AIR JETS
Formation and Development of Submerged Air Jets 137 FORMATION AND DEVELOPMENT OF SUBMERGED AIR JETS Sultana R. Syeda* and Ashfaq M. Ansery Department of Chemical Engineering Bangladesh University of Engineering
More informationCFD SIMULATIONS IN AN INTERNAL CIRCULATION AIRLIFT OPERATING UNDER HOMOGENEOUS REGIME
CFD SIMULATIONS IN AN INTERNAL CIRCULATION AIRLIFT OPERATING UNDER HOMOGENEOUS REGIME P. A. S. Monteiro 1, P. Seleghim Jr. 1 1 University of São Paulo, Engineering School of São Carlos, Mechanical Engineering
More informationModeling of Surfzone Bubbles Using a Multiphase VOF Model
Modeling of Surfzone Bubbles Using a Multiphase VOF Model Fengyan Shi 1, James T. Kirby 1, Merrick Haller 2, and Patricio Catalán 2 We formulate a general multiphase model representing water-bubble mixture
More informationCFD Analysis and Experimental Study on Impeller of Centrifugal Pump Alpeshkumar R Patel 1 Neeraj Dubey 2
IJSRD - International Journal for Scientific Research & Development Vol. 3, Issue 2, 21 ISSN (online): 2321-613 Alpeshkumar R Patel 1 Neeraj Dubey 2 1 PG Student 2 Associate Professor 1,2 Department of
More informationStudent name: + is valid for C =. The vorticity
13.012 Marine Hydrodynamics for Ocean Engineers Fall 2004 Quiz #1 Student name: This is a closed book examination. You are allowed 1 sheet of 8.5 x 11 paper with notes. For the problems in Section A, fill
More informationFLUID MECHANICS Time: 1 hour (ECE-301) Max. Marks :30
B.Tech. [SEM III(ME&CE)] QUIZ TEST-1 (Session : 2013-14) Time: 1 hour (ECE-301) Max. Marks :30 Note: Attempt all questions. PART A Q1. The velocity of the fluid filling a hollow cylinder of radius 0.1
More informationA Numerical Prediction of the Hydrodynamic Torque acting on a Safety Butterfly Valve in a Hydro-Electric Power Scheme
A Numerical Prediction of the Hydrodynamic Torque acting on a Safety Butterfly Valve in a Hydro-Electric Power Scheme School of Engineering University of Tasmania Hobart AUSTRALIA alan.henderson@utas.edu.au
More informationStatic Fluids. **All simulations and videos required for this package can be found on my website, here:
DP Physics HL Static Fluids **All simulations and videos required for this package can be found on my website, here: http://ismackinsey.weebly.com/fluids-hl.html Fluids are substances that can flow, so
More informationSimulations of Turbulent Drag Reduction Using Micro-Bubbles
See discussions, stats, and author profiles for this publication at: https://www.researchgate.net/publication/254856208 Simulations of Turbulent Drag Reduction Using Micro-Bubbles Article January 2003
More informationDevelopment of a Simulation Model for Swimming with Diving Fins
Proceedings Development of a Simulation Model for Swimming with Diving Fins Motomu Nakashima 1, *, Yosuke Tanno 2, Takashi Fujimoto 3 and Yutaka Masutani 3 1 Department of Systems and Control Engineering,
More informationNumerical Investigation of Multi Airfoil Effect on Performance Increase of Wind Turbine
International Journal of Engineering & Applied Sciences (IJEAS) International Journal of Engineering Applied Sciences (IJEAS) Vol.9, Issue 3 (2017) 75-86 Vol.x, Issue x(201x)x-xx http://dx.doi.org/10.24107/ijeas.332075
More informationCFD Analysis ofwind Turbine Airfoil at Various Angles of Attack
IOSR Journal of Mechanical and Civil Engineering (IOSR-JMCE) e-issn: 2278-1684,p-ISSN: 2320-334X, Volume 13, Issue 4 Ver. II (Jul. - Aug. 2016), PP 18-24 www.iosrjournals.org CFD Analysis ofwind Turbine
More informationMODELING OF RADIAL GAS FRACTION PROFILES FOR BUBBLE FLOW IN VERTICAL PIPES
FR0108111 MODELING OF RADIAL GAS FRACTION PROFILES FOR BUBBLE FLOW IN VERTICAL PIPES D. LUCAS, E. KREPPER, H.-M. PRASSER Forschungszentrum Rossendorf e.v., Institute of Safety Research, P.O.Box 510 119,
More informationGravity waves in stable atmospheric boundary layers
Gravity waves in stable atmospheric boundary layers Carmen J. Nappo CJN Research Meteorology Knoxville, Tennessee 37919, USA Abstract Gravity waves permeate the stable atmospheric planetary boundary layer,
More informationA CFD analysis of the air entrainment rate due to a plunging steel jet combining mathematical models for dispersed and separated multiphase flows
A CFD analysis of the air entrainment rate due to a plunging steel jet combining mathematical models for dispersed and separated multiphase flows arald Laux and tein Tore Johansen INTEF Materials Technology
More information