Tutorial 3_jan2015.PDF (Fluid Mech)

March 30, 2018 | Author: pijechad | Category: Pressure Measurement, Pascal (Unit), Pressure, Statistical Mechanics, Quantity


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Fluid Mechanics (CLB 11003) Chapter 3: Static fluid TUTORIAL 3 1. Define Pascal’s law. 2. What is difference between gage pressure and absolute pressure? 3. A vacuum gage connected to a chamber reads 24 kPa at a location where the barometric reading is 600 mm Hg. Determine the absolute pressure in the chamber (Hg = 13,590 kg/m3). (Ans: 56 kPa) 4. The water in a tank is pressurized by air and the pressure is measured by a multifluid manometer as shown in Figure 1. Determine the gage pressure of air in the tank is if h1 = 0.2 m, h2 = 0.3 m and h3 = 0.46 m. Take the densities of water, oil and mercuries to be 1000 kg/m3, 850 kg/m3 and 13,600 kg/m3, respectively. (Ans:56.9 kPa) Figure 1 5. Determine the pressure exerted on the surface of a submarine cruising 300 ft below the free surface of the sea. Assume that the barometric pressure is 14.7 psia and the specific gravity of sea water is 1.03 (water at 32F is 62.4 lbm/ft3). (Ans: 149 psia) 56). Show that the pressure at point A can be expressed as: PA = mangh2 – Pgh1 Fluid P Density.43 m. man Figure 3 8. The pressure at the bottom of a tank of water is measured with a mercury manometer where hwater = 3. What is the gauge pressure at the bottom of the tank? (Relative density mercury = 13.  D A h2 h1 B C Manometric Fluid Density. (Ans: 27.8 kPa) Figure 4 .Fluid Mechanics (CLB 11003) Chapter 3: Static fluid 6. What are the values of P(x). PA(y) and PB(z) as shown in Figure 2? P = PA PA = 90 kPa gauge Local atmospheric pressure PA = (y) kPa abs abs PB = (z) kPa g P = (x) kPa g = 101 kPa abs P = PB Patm = 101 kPa abs PB = 51 kPa abs Absolute Zero P = 0 Pa abs Figure 2 7.0m and hmercury = 0. 600 kg/m3. what is the pressure difference measured by the manometer? (Ans: 75. Fresh and seawater flowing in parallel horizontal pipelines are connected to each other by a double U-tube manometer as shown in Figure 6.34 kPa) Figure 5 10.39 kPa) P1 P2 Figure 6 .Fluid Mechanics (CLB 11003) Chapter 3: Static fluid 9. A U-tube manometer containing mercury of density 13600 kg/m3 is used to measure the pressure drop along a horizontal pipe.6m. water and mercury to be sea = 1035 kg/m3 and Hg = 13. Take the densities of seawater. Determine the pressure difference between the two pipelines. (Ans: 3.8 and the manometer reading is 0. If the fluid in the pipe has a relative density of 0. Fluid Mechanics (CLB 11003) Chapter 3: Static fluid 11. If a 10 cm high portion of the ice block extends above the surface of the water.4 lbm/ft3). The specific gravities of ice and seawater are 0.88. (Ans: 10. SGwater = 1 and SGair = 0.23 kPa) Figure 7 12. respectively.6. Consider a large cubic ice block floating in seawater. determine the height of the ice block below the surface. A crane is used to lower weights into a lake for an underwater construction project. (Ans: 87.82.025. Define buoyancy.92 and 1. Determine the pressure difference between points A and B in Figure 7 (SGbenzene = 0. Determine the tension in the rope of the crane due to a 3 ft diameter spherical steel block (density = 494 lbm/ft3) when it is (a) suspended in the air and (b) completely immersed in water (density = 62.6 cm) Figure 8 . SGHg = 13. 13. SGkerosene = 0. 6980 lbf. (Ans: a). b) 6100 lbf) 14.0118.
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