Tutorial 2 Fluid pressure
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1 Tutorial 2 Fluid pressure 1. cylinder contains a fluid at a gauge pressure of 360 KN/m 2. Express this pressure in terms of a head of (a) water, and (b) mercury of sp gr = 13.6 What would be the absolute pressure in the cylinder if atmospheric pressure is 760mm Hg. Pressure (P) = 360 KN/m 2 = 360x10 3 N/m 2 Head (h) =? where ρ = Density of fluid a) Head in terms of water (ρ = 1000 kg/m 3 ) = 36.7m b) Head in terms of mercury ρ = sp gr x density of water = 13.6x1000 = kg/m 3 = 2.7m tmospheric pressure (h) = 760mmhg = 0.76m hg tmospheric pressure ( ) = N/m 2 = 101.3KN/m 2 bsolute pressure (Pabs) =? Pabs = Pgauge + Patm = = 461.3KN/m 2 2. What would the pressure in kn/m 2 be if the equivalent head is measured as 400mm of (a) mercury (sp gr 13.6) (b) water (c) oil specific weight 7.9 kn/m 3 (d) a liquid of density 520 kg/m 3? Head (h) = 400mm = 0.4m Pressure (P) =? where ρ = Density of fluid a) In terms of mercury, ρ = sp gr x density of water = 13.6x1000 = kg/m 3 = 13600x9.81x0.4 = N/m 2 = KN/m 2 b) In terms of water, ρ = 1000 kg/m 3 = 1000x9.81x0.4 = 3924 N/m 2 = KN/m 2 c) In terms of oil of sp. wt. ( ) = 7.9 kn/m 3
2 = 7.9x.4 = 3.16 KN/m 2 d) In terms of liquid with ρ = 520 kg/m 3 = 520x9.81x0.4 = 2040 N/m 2 = 2.04 KN/m 2 3. manometer connected to a pipe indicates a negative gauge pressure of 50mm of mercury. What is the absolute pressure in the pipe in N/m 2 if the atmospheric pressure is 1 bar? tmospheric pressure (Patm) = 1 bar = 1x10 5 N/m 2 Head (h) = -50mmhg = -0.05m hg bsolute pressure (pabs) =? ρ of mercury = sp gr x density of water = 13.6x1000 = kg/m 3 Gauge pressure (Pgauge) = x9.81x0.05 = N/m 2 Pabs = Pgauge + Patm = x10 5 = N/m 2 = 93.3KN/m 2 4. n open tank contains 5.7m of water covered with 2.6m of kerosene (sp wt = 8KN/m 3 ). Find the pressure at the interface and at the bottom of the tank. Height of kerosene (h) = 2.6m Height of water (h1) = 5.7m Sp wt of kerosene ( ) = 8KN/m 3 Pressure at interface (Pint) =? Pressure at bottom (Pbottom) =? = 8x2.6 = 20.8KN/m 2 = x5.7 = 76.7 KN/m 2 5. The closed tank in the fig. is at 20 0 C. If the pressure at point is 96 Kpa absolute, what is the absolute pressure at point? What percent error results from neglecting the specific weight of air? (Take sp wt of air = KN/m 3 ) 5m ir D ir 3m C 5m 3m
3 Sp wt of air ( ) = KN/m 3 Sp wt of water ( ) = 9.81 KN/m 3 Starting from, P + P C -P CD -P D = P P = x5 9.81x x3 = Kpa Neglecting air, P = x2 = Kpa Error = ( )/ = = 0.031% 6. In the fig., the pressure at point is 2900 N/m 2. Determine the pressures at points, C and D. (Take density of air = 1.2 kg/m 3 ) 1m ir ir C ir 0.8m 1.5m 2m X D 0.7m Density of water (ρ) = 1000kg/m 3 P = 2900 N/m 2 Density of air ( ) = 1.2 kg/m 3 P =?, P C =?, P D =? Starting from, = x9.81x0.2 = 938 N/m 2 = x9.81x x9.81x2.3 = N/m 2 = x9.81x2 = N/m 2
4 7. In the fig., the absolute pressure at the bottom of the tank is Kpa. Compute the sp gr of olive oil. Take atmospheric pressure = Kpa. Oil (sp gr = 0.9) 1.5m 2.5m Olive oil 2.9m Mercury 0.4m bsolute pressure at bottom (P abs ) =233.5 Kpa tmospheric pressure (P atm ) = Kpa Sp wt of water ( ) = 9.81 KN/m 3 Sp wt of oil ( ) = 0.9x9.81 KN/m 3 = KN/m 3 Sp wt of mercury ( ) = 13.6x9.81 KN/m 3 = KN/m 3 Sp gr of olive oil (S) =? P abs = P atm + P gauge P abs = P atm + P oil + P water + P olive oil + P mercury KN/m 3 = The tube shown in the fig. is filled with oil of sp gr Determine the pressure heads at and in meters of water. oil 2.1m ir X oil 0.5m oil
5 sp gr of oil = 0.82 Sp wt of oil ( ) = 0.82x9810 = N/m 3 Head in terms of water at a and (h and h ) =? Take atmospheric pressure to be 0 for gauge pressure. = x2.6 = Pa = m = m = x2.1= Pa 9. Calculate the pressures at,, C and D in the fig. ir ir C 0.4m X Oil Sp gr m 0.5m 1 m D Sp wt of water ( ) = 9810 N/m 3 sp gr of oil = 0.9 Sp wt of oil ( ) = 0.9x9810 = 8829 N/m 3 Take atmospheric pressure to be 0 for gauge pressure. = x0.8 = 7848 Pa = 9810x0.5 = 4905 Pa Neglecting air, P C =P = 4905 Pa = x1.9 = Pa
6 10. The tank in the fig. contains oil of sp gr Determine the reading of gauge in N/m 2. ir 3m Oil X 0.2m Hg sp gr of oil = 0.75 Sp wt of oil ( ) = 0.75x9810 = N/m 3 Sp wt of mercury ( ) = 13600x9.81 N/m 3 = N/m 3 Take atmospheric pressure to be 0 for gauge pressure. Starting from X and neglecting air, P = x x3 = N/m 2
7 11. In the left hand of the fig., the air pressure is -225mm of Hg. Determine the elevation of the gauge liquid in the right hand column at. 20.4KN/m m ir ir Oil Sp gr = m 106m h Liquid (sp gr. = 1.6) ir pressure at the left hand tank = -225mm Hg = m Hg Sp wt of water ( ) = 9810 N/m 3 Sp wt of oil ( ) = 0.8x9810 = 7848 N/m 3 Sp wt of mercury ( ) = 13600x9.81 KN/m3 = KN/m 3 Sp wt of liquid ( ) = 1.6x9810 = N/m 3 = x = N/m 2 P = P x( ) xh = x( h) h = 5.96m Elevation at = = m
8 12. Compartments and C in the fig. are closed and filled with air. The barometer reads Kpa. When gages and D read as indicated, what should be the value of x for gage E? (Hg in each tube) 206.8Kpa C 254mm x D E P = KPa = Pa Sp wt of mercury ( ) = 13.6x9810 N/m 3 = N/m 3 Starting from and neglecting air, X x0.254 = 0 X = 1.8m 13. In the fig., the areas of the plunger and cylinder are 38.7 cm 2 and 387 cm 2, respectively, and the weight of is 4500 N. The vessel and the connecting passages are filled with oil of specific gravity What force F is required for equilibrium, neglecting the weight of? F Oil (sp gr = 0.75) 4.8m X L X R
9 rea of ( ) =38.7 cm 2, rea of ( ) =387 cm 2 Weight of (W ) = 4500N Sp wt of water ( ) = 9810 N/m 3 Sp wt of oil ( ) = 0.75x9810 N/m 3 = N/m 3 Pressure at X L = Pressure at X R P x4.8 = 4500/387x10-4 P = N/m 2 F = P = x 38.7x10-4 = 313N 14. For the open tank, with piezometers attached on the side, containing two different immiscible liquids as shown in the fig., find (a) the elevation of liquid surface in piezometer, (b) the elevation of liquid surface in piezometer, and (c) the total pressure at the bottom of the tank. Elv 2.1m Liquid (sp gr = 0.72) Elv 0.3m Elv 0m Liquid (sp gr = 2.36) Sp wt of liquid ( ) = 0.72x9810 N/m 3 = N/m 3 Sp wt of liquid ( ) = 2.36x9810 N/m 3 = N/m 3 a) Elevation of liquid surface in piezometer = elevation of liquid in the tank = 2.1 m b) Pressure due to at the interface (P ) = = x ( ) = N/m 2 Equivalent head for liquid due to P is = / = 0.55m Elevation of liquid surface in piezometer = Elv of liquid at + h = = 0.85m c) Total pressure at the bottom = = x ( ) x0.3 = N/m 2
10 15. In the fig., gage reads 290Kpa abs. What is the height of water h? What does gage read? ir : 175Kpa abs h Hg 70cm Sp wt of water ( ) = 9.81 KN/m 3 Sp wt of mercury ( ) = 13.6x9.81 = KN/m 3 P =290Kpa abs h =? P =? 290 = h x0.7 h = 2.2m ( ) P = ( ) = KN/m 2
11 16. manometer is attached to a tank containing three different fluids as shown in fig. What will be the difference in elevation of the mercury column in the manometer (i.e. y)? Elv 6m ir pressure = 35Kpa Elv 5m Oil (sp gr = 0.82) Elv 2m Elv 0m 1m y Hg Sp wt of water ( ) = 9.81 KN/m 3 Sp wt of mercury ( ) = 13.6x9.81 = KN/m 3 Sp wt of oil ( ) = 0.82x9.81 = KN/m 3 P = P x3+9.81x3= y y = 0.66m
12 17. Determine the pressure difference between two points and in the fig. Kerosene Sp. gr. = 0.82 enzene Sp. gr. = 0.88 ir Sp. wt. = N/m 3 21cm 9cm 41cm 15cm 10cm Mercury Sp. gr. = 13.6 Sp wt of water ( ) = 9.81 KN/m 3 Sp wt of mercury ( ) = 13.6x9.81 = KN/m 3 Sp wt of benzene ( ) = 0.88x9.81 = KN/m 3 Sp wt of kerosene ( ) = 0.82x9.81 = KN/m 3 Sp wt of air ( ) = KN/m 3 Starting from, ( ) ( ) P P = Kpa
13 18. Fig. below shows a conical vessel having its outlet at to which a U-tube manometer is connected. The reading of the manometer given in the fig. shows when the vessel is empty. Find the reading of the manometer when the vessel is completely filled with water. 2m 3m h 20 cm Initial Final Hg y h Sp wt of water ( ) = 9.81 KN/m 3 Sp wt of mercury ( ) = 13.6x9.81 = KN/m 3 When the vessel is empty, equating pressure at initial level 9.81 y = x0.2 y = 2.72m When the vessel is filled with water, let us say the mercury moves by height h Equating pressure at final level ( ) ( ) ( ) ( ) h = m Deflection of mercury = 2h+0.2 =2x = 0.429m
14 19. Compute the absolute pressure at point in the fig. Oil Sp. gr. = cm 15cm 17.5cm Sp wt of water ( ) = 9.81 KN/m 3 Sp wt of mercury ( ) = 13.6x9.81 = KN/m 3 Sp wt of oil ( ) = 0.88x9.81 = KN/m 3 Starting from, Mercury Sp. gr. = 13.6 P = 27.7 Kpa bsolute pressure at = Patm = = 129Kpa 20. The fig. shows a 1cm diameter U-tube containing mercury. If now 20cc of water is poured into the right leg, find the levels of the free liquid surfaces in the two tubes. 18cm y E y F h Mercury
15 With the addition of 20ml of water, Drop in mercury level in right leg = y Rise in mercury level in left leg = y Depth of water column = h h= Vol of water added/cross sectional area = ( ) = 0.254m P E = P F 13.6x9810x2y = 9810x0.254 y = m = 0.93cm Height of free mercury level in the left leg = = 18.93cm Height of free water level in the right leg = = 42.47cm 21. The diameters of the limbs and of a U-tube shown in fig. are 5mm and 20mm respectively. The limb contains a liquid of sp. gr. 0.9 while the limb contains a liquid of sp.gr The fig. shows the position of the liquids in the two limbs. Find what pressure should be applied on the surface of the heavier liquid in limb so that the rise in level in the limb is 10mm. 10mm P liquid of sp.gr. = 0.9 ha h hb E F E1 10mm F1 liquid of sp.gr. = 1.3 External pressure P No external pressure Sp gr of liquid in = 0.9 Sp. gr. of liquid in = 1.3 Diameter of limb = 5mm Diameter of limb = 20mm
16 a. When no external pressure is applied P E = P F (a) b. When external force p is applied on the surface of liquid Rise in limb = 10mm Fall in limb = h Level EF shifts to new position is E1F1. Volume of liquid transferred to left limb = Volume of liquid fell in right limb c/s area of left limbx10mm = c/s of right limbxh ( ( ) ) ( ( ) ) h = m P E1 = P F1 ( ) ( ) ( ) ( ) (b) From a and b ( ) P = N/m Find the pressure difference between containers and shown in the figure. ir cm 50cm 30cm E Mercury F 15cm
17 Pressure at E = pressure at F = N/m n 8cm diameter piston compresses manometer oil into an inclined 7mm diameter tube, as shown in figure below. When a weight W is added to the top of the piston, the oil rises an additional distance of 10cm up the tube. How large is the weight, in N? W 10cm h X Y L1 Initial level Final level Y X Piston dh D = 8cm Oil, sp gr = D = 7mm 15 0 Diameter of piston (D) = 8cm = 0.08m Diameter of tube (d) = 7mm = 0.007m h = 0.10Sin15 = m When the manometer is not connected to the container, the mercury in the reservoir is at original level and at level in the tube. Equating pressure at XX (a) Due to compression, the fluid in the container moves down by dh and the fluid in the tube moves up by 10cm. Volume of fluid fallen = Volume of fluid risen dh = m Equating the pressure at new level (YY) From a and b ( ) (b)
18 ( ) Neglecting dh W = 1.05 N 24. Figure below shows a pipe containing a liquid of sp gr 0.8 connected to a single column micromanometer. The area of reservoir is 60 times that of the tube. The manometer liquid is mercury. Find the pressure in the pipe. Liquid of sp gr 0.8 y 0.25m dy Z X X Z h1 Hg When the manometer is not connected to the container, the mercury in the reservoir is at original level and at level in the tube. Equating pressure at XX (a) Due to pressure, manometric liquid in the reservoir drops by dy and it will travel a distance of 0.25m in the tube. Volume of fluid fallen = Volume of fluid risen dy=ax ady = ax0.25 dy = m Equating pressure at new level (ZZ) ( ) ( ) (b) From a and b ( ) ( ) = N/m 2
19 25. Find the gauge readings at and if the atmospheric pressure is 755mmHg. Closed ir Hg Vapor Oil, sp. gr. = m 0.6m C D 0.2m 2m Hg tm. pr. = = N/m 2 Neglect pressure due to mercury vapor and air (small) Writing pressure equation for gauge, = 13.6x9810x0.6 = N/m 2 (abs. pr.) Gauge pressure at = bs. pr. - tm. pr. = = N/m 2 Writing pressure equation for gauge starting from gauge = N/m 2 Gauge pressure at = N/m 2
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