# Unit code: H/ QCF level: 5 Credit value: 15 OUTCOME 3 - STATIC AND DYNAMIC FLUID SYSTEMS TUTORIAL 2 - STATIC FLUID SYSTEMS

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1 Unit 43: Plant and Process Principles Unit code: H/ QCF level: 5 Credit value: 15 OUTCOME 3 - STATIC AN YNAMIC FLUI SYSTEMS TUTORIAL - STATIC FLUI SYSTEMS 3 Understand static and dnamic fluid sstems with reference to plant engineering Immersed surfaces: rectangular and circular surfaces, including retaining walls, tank sides, sluice gates, inspection covers, valve flanges; hdrostatic pressure and thrust on immersed surfaces Centre of pressure: use of parallel axis theorem for immersed rectangular and circular surfaces Viscosit shear stress; shear rate; dnamic viscosit: kinematic viscosit Pipeline flow: head losses e.g. Bernoulli s equation and determination of head loss in pipes b Arc s formula; Mood diagram; head loss due to sudden enlargement and contraction of pipe diameter; head loss at entrance to a pipe; head loss in valves; Renolds number; inertia and viscous resistance forces; laminar and turbulent flow; critical velocities Impact of a jet: power of a jet normal thrust on a moving flat vane; thrust on a moving hemispherical cup; velocit diagrams to determine thrust on moving curved vanes; fluid friction losses; sstem efficienc On completion of this tutorial ou should be able to do the following. efine the main fundamental properties of liquids. Calculate the forces and moments on submerged surfaces. Before ou start ou should make sure that ou full understand first and second moments of area. If ou are not familiar with this, ou should do that tutorial before proceeding. Let s start this tutorial b studing the fundamental properties of liquids..j.unn freestud.co.uk 1

2 1. SOME FUNAMENTAL STUIES 1.1 IEAL LIQUIS An ideal liquid is defined as follows. It is INVISCI. This means that molecules require no force to separate them. The topic is covered in detail in chapter 3. It is INCOMPRESSIBLE. This means that it would require an infinite force to reduce the volume of the liquid. 1. REAL LIQUIS VISCOSITY Real liquids have VISCOSITY. This means that the molecules tend to stick to each other and to an surface with which the come into contact. This produces fluid friction and energ loss when the liquid flows over a surface. Viscosit defines how easil a liquid flows. The lower the viscosit, the easier it flows. BULK MOULUS Real liquids are compressible and this is governed b the BULK MOULUS K. This is defined as follows. K = Vp/V p is the increase in pressure, V is the reduction in volume and V is the original volume. ENSITY ensit relates the mass and volume such that = m/v kg/ m 3 PRESSURE Pressure is the result of compacting the molecules of a fluid into a smaller space than it would otherwise occup. Pressure is the force per unit area acting on a surface. The unit of pressure is the N/m and this is called a PASCAL. The Pascal is a small unit of pressure so higher multiples are common. 1 kpa = 10 3 N/m 1 MPa = 10 6 N/m Another common unit of pressure is the bar but this is not an SI unit. 1 bar = 10 5 N/m 1 mb = 100 N/m GAUGE AN ABSOLUTE PRESSURE Most pressure gauges are designed onl to measure and indicate the pressure of a fluid above that of the surrounding atmosphere and indicate zero when connected to the atmosphere. These are called gauge pressures and are normall used. Sometimes it is necessar to add the atmospheric pressure onto the gauge reading in order to find the true or absolute pressure. Absolute pressure = gauge pressure + atmospheric pressure. Standard atmospheric pressure is bar..j.unn freestud.co.uk

3 . HYROSTATIC FORCES When ou have completed this section, ou should be able to do the following. Calculate the pressure due to the depth of a liquid. Calculate the total force on a vertical surface. efine and calculate the position of the centre of pressure for various shapes. Calculate the turning moments produced on verticall immersed surfaces. Explain the principles of simple hdraulic devices. Calculate the force and movement produced b simple hdraulic equipment..1 HYROSTATIC PRESSURE.1.1 PRESSURE INSIE PIPES AN VESSELS Pressure results when a liquid is compacted into a volume. The pressure inside vessels and pipes produce stresses and strains as it tries to stretch the material. An example of this is a pipe with flanged joints. The pressure in the pipe tries to separate the flanges. The force is the product of the pressure and the bore area. Fig.1 WORKE EXAMPLE No. 1 Calculate the force tring to separate the flanges of a valve (Fig.1) when the pressure is MPa and the pipe bore is 50 mm. SOLUTION Force = pressure x bore area Bore area = /4 = x 0.05 /4 = x 10-3 m Pressure = x 10 6 Pa Force = x 10 6 x x 10-3 = 3.97 x 10 3 N or 3.97 kn.j.unn freestud.co.uk 3

4 .1. PRESSURE UE TO THE WEIGHT OF A LIQUI Consider a tank full of liquid as shown. The liquid has a total weight W and this bears down on the bottom and produces a pressure p. Pascal showed that the pressure in a liquid alwas acts normal (at 90 o ) to the surface of contact so the pressure pushes down onto the bottom of the tank. He also showed that the pressure at a given point acts equall in all directions so the pressure also pushes up on the liquid above it and sidewas against the walls. The volume of the liquid is V = A h m 3 Fig. The mass of liquid is hence m = V = Ah kg The weight is obtained b multipling b the gravitational constant g. W = mg = Ahg Newton The pressure on the bottom is the weight per unit area p = W/A N/m It follows that the pressure at a depth h in a liquid is given b the following equation. p = gh The unit of pressure is the N/m and this is called a PASCAL. The Pascal is a small unit of pressure so higher multiples are common. WORKE EXAMPLE Calculate the pressure and force on an inspection hatch 0.75 m diameter located on the bottom of a tank when it is filled with oil of densit 875 kg/m 3 to a depth of 7 m. SOLUTION The pressure on the bottom of the tank is found as follows. p = g h = 875 kg/m 3 g = 9.81 m/s h = 7 m p = 875 x 9.81 x 7 = N/m or kpa The force is the product of pressure and area. A = /4 = x 0.75 /4 = 0.44 m F = p A = x 10 3 x 0.44 = 6.55 x 10 3 N or 6.55 Kn.J.UNN freestud.co.uk 4

5 .1.3 PRESSURE HEA When h is made the subject of the formula, it is called the pressure head. h = p/g Pressure is often measured b using a column of liquid. Consider a pipe carring liquid at pressure p. If a small vertical pipe is attached to it, the liquid will rise to a height h and at this height, the pressure at the foot of the column is equal to the pressure in the pipe. Fig.3 This principle is used in barometers to measure atmospheric pressure and manometers to measure gas pressure. Barometer Fig.4 Manometer In the manometer, the weight of the gas is negligible so the height h represents the difference in the pressures p 1 and p. p 1 - p = g h In the case of the barometer, the column is closed at the top so that p = 0 and p 1 = p a. The height h represents the atmospheric pressure. Mercur is used as the liquid because it does not evaporate easil at the near total vacuum on the top of the column. P a = g h WORKE EXAMPLE No.3 A manometer (fig.4) is used to measure the pressure of gas in a container. One side is connected to the container and the other side is open to the atmosphere. The manometer contains oil of densit 750 kg/m 3 and the head is 50 mm. Calculate the gauge pressure of the gas in the container. SOLUTION p 1 - p = g h = 750 x 9.81 x 0.05 = Pa Since p is atmospheric pressure, this is the gauge pressure. p = Pa (gauge).j.unn freestud.co.uk 5

6 SELF ASSESSMENT EXERCISE No.1 1. A mercur barometer gives a pressure head of 758 mm. The densit is kg/m3. Calculate the atmospheric pressure in bar. ( bar). A manometer (fig.4) is used to measure the pressure of gas in a container. One side is connected to the container and the other side is open to the atmosphere. The manometer contains water of densit 1000 kg/m 3 and the head is 50 mm. Calculate the gauge pressure of the gas in the container. (.45.5 kpa) 3. Calculate the pressure and force on a horizontal submarine hatch 1. m diameter when it is at a depth of 800 m in seawater of densit 1030 kg/m 3. (8.083 MPa and 9.14 MN) 3. FORCES ON SUBMERGE SURFACES 3.1 TOTAL FORCE Consider a vertical area submerged below the surface of liquid as shown. The area of the elementar strip is da = B d You should alread know that the pressure at depth h in a liquid is given b the equation p = gh where is the densit and h the depth. In this case, we are using to denote depth so p = g The force on the strip due to this pressure is Fig.5 df = p da =B g d The total force on the surface due to pressure is denoted R and it is obtained b integrating this expression between the limits of 1 and. It follows that 1 R ρgb 1 1 This ma be factorised. R ρgb ( - 1 ) = so B( - 1 ) = B =Area of the surface A ( + 1 )/ is the distance from the free surface to the centroid. It follows that the total force is given b the expression R = ga The term A is the first moment of area and in general, the total force on a submerged surface is.j.unn freestud.co.uk 6

7 R = g x 1st moment of area about the free surface..j.unn freestud.co.uk 7

8 3. CENTRE OF PRESSURE The centre of pressure is the point at which the total force ma be assumed to act on a submerged surface. Consider the diagram again. The force on the strip is df as before. This force produces a turning moment with respect to the free surface s s. The turning moment due to df is as follows. dm = df = gbd The total turning moment about the surface due to pressure is obtained b integrating this expression between the limits of 1 and. M ρgb d ρgb B definition Hence I ss B d d M = giss This moment must also be given b the total force R multiplied b some distance h. The position at depth h is called the CENTRE OF PRESSURE. h is found b equating the moments. M h R h ρ g A ρ g I ρ g Iss Iss h ρ g A A nd ss moment of area h about s - s st 1 moment of area In order to be competent in this work, ou should be familiar with the parallel axis theorem (covered in part 1) because ou will need it to solve nd moments of area about the free surface. The rule is as follows. Iss = Igg + A Iss is the nd moment about the free surface and Igg is the nd moment about the centroid. You should be familiar with the following standard formulae for nd moments about the centroid. Rectangle I gg = B3/1 Rectangle about its edge I = B 3 /3 Circle I gg = 4/64.J.UNN freestud.co.uk 8

9 WORKE EXAMPLE No.4 Show that the centre of pressure on a vertical retaining wall is at /3 of the depth. Go on to show that the turning moment produced about the bottom of the wall is given b the expression gh 3 /6 for a unit width. SOLUTION Fig.6 For a given width B, the area is a rectangle with the free surface at the top edge. h A bh 1 st nd h moment of area about the top edge is A B h moment of area about the top edge is B 3 3 h nd B moment h 3 st 1 moment h B h h 3 It follows that the centre of pressure is h/3 from the bottom. The total force is R = ga = gbh / and for a unit width this is gh / The moment bout the bottom is R x h/3 = (gh /) x h/3 = gh 3 /6 3 SELF ASSESSMENT EXERCISE No. 1. A vertical retaining wall contains water to a depth of 0 metres. Calculate the turning moment about the bottom for a unit width. Take the densit as 1000 kg/m 3. (13.08 MNm). A vertical wall separates seawater on one side from fresh water on the other side. The seawater is 3.5 m deep and has a densit of 1030 kg/m 3. The fresh water is m deep and has a densit of 1000 kg/m 3. Calculate the turning moment produced about the bottom for a unit width. (59.1 knm).j.unn freestud.co.uk 9

10 WORKE EXAMPLE No.5 A concrete wall retains water and has a hatch blocking off an outflow tunnel as shown. Find the total force on the hatch and the position of the centre of pressure. Calculate the total moment about the bottom edge of the hatch. The water densit is1000 kg/m3. SOLUTION Fig.7 Total force = R = g A For the rectangle shown = ( /) = 3 m. A = x 3 = 6 m. R = 1000 x 9.81 x 6 x 3 = N or kn h = nd mom. of Area/ 1st mom. of Area 1 st moment of Area = A = 6 x 3 = 18 m3. nd mom of area = Iss = (B3/1) + A= ( x 33/1) + (6 x 3) Iss= = 58.5 m4. h = 58.5/18 = 3.5 m The distance from the bottom edge is x = = 1.5 m Moment about the bottom edge is = Rx = x 1.5 = 0.75 knm..j.unn freestud.co.uk 10

11 WORKE EXAMPLE No.6 Find the force required at the top of the circular hatch shown in order to keep it closed against the water pressure outside. The densit of the water is 1030 kg/m3. = m from surface to middle of hatch. Fig. 8 Total Force = R = g A = 1030 x 9.81 x ( x /4) x = N or kn Centre of Pressure h = nd moment/1 st moment nd moment of area. Iss = Igg + A =( x 4/64) + ( x /4) x Iss = m4. 1 st moment of area A = ( x /4) x = 6.83 m3. Centre of pressure. h = /6.83 =.15 m This is the depth at which, the total force ma be assumed to act. Take moments about the hinge. F = force at top. R = force at centre of pressure which is 0.15 m below the hinge. For equilibrium F x 1 = x 0.15 Fig. 9 F = kn.j.unn freestud.co.uk 11

12 WORKE EXAMPLE No.7 The diagram shows a hinged circular vertical hatch diameter that flips open when the water level outside reaches a critical depth h. Show that for this to happen the hinge must be located 8h - 5 at a position x from the bottom given b the formula x 8h - 4 Given that the hatch is 0.6 m diameter, calculate the position of the hinge such that the hatch flips open when the depth reaches 4 metres. SOLUTION Fig.10 The hatch will flip open as soon as the centre of pressure rises above the hinge creating a clockwise turning moment. When the centre of pressure is below the hinge, the turning moment is anticlockwise and the hatch is prevented from turning in that direction. We must make the centre of pressure at position x. h - h h - x second moment of area h about thesurface first moment of area I h h - x 16 x h - h - h h - x - A A Equate for h gg 16h h - 8 x 1- π π 64 4 π 4 8h h - 4-8h Putting = 0.6 and h = 4 we get x = 0.5 m 8h - 5 8h - 4.J.UNN freestud.co.uk 1

13 SELF ASSESSMENT EXERCISE No.3 1. A circular hatch is vertical and hinged at the bottom. It is m diameter and the top edge is m below the free surface. Find the total force, the position of the centre of pressure and the force required at the top to keep it closed. The densit of the water is 1000 kg/m3. (9.469 kn, 3.08 m,4.5 kn). A large tank of sea water has a door in the side 1 m square. The top of the door is 5 m below the free surface. The door is hinged on the bottom edge. Calculate the force required at the top to keep it closed. The densit of the sea water is 1036 kg/m3. (7.11 N) 3. A culvert in the side of a reservoir is closed b a vertical rectangular gate m wide and 1 m deep as shown in fig. 11. The gate is hinged about a horizontal axis which passes through the centre of the gate. The free surface of water in the reservoir is.5 m above the axis of the hinge. The densit of water is 1000 kg/m3. Assuming that the hinges are frictionless and that the culvert is open to atmosphere, determine (i) the force acting on the gate when closed due to the pressure of water. ( kn) (ii) the moment to be applied about the hinge axis to open the gate. (1635 Nm) Fig.11.J.UNN freestud.co.uk 13

14 4. The diagram shows a rectangular vertical hatch breadth B and depth. The hatch flips open when the water level outside reaches a critical depth h. Show that for this to happen the hinge must be located at a position x from the bottom given b the formula 6h - 4 x 6h - 3 Given that the hatch is 1 m deep, calculate the position of the hinge such that the hatch flips open when the depth reaches 3 metres. (0.466 m) Fig.1 5. Fig.13 shows an L shaped spill gate that operates b pivoting about hinge O when the water level in the channel rises to a certain height H above O. A counterweight W attached to the gate provides closure of the gate at low water levels. With the channel empt the force at sill S is kn. The distance l is 0.5m and the gate is m wide. etermine the magnitude of H. (i) when the gate begins to open due to the hdrostatic load. (1 m) (ii) when the force acting on the sill becomes a maximum. What is the magnitude of this force. (0.5 m) Assume the effects of friction are negligible. Fig.13.J.UNN freestud.co.uk 14

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