If at 20°C, a droplet of water has pressure difference of 5 kPa, then at same temperature, a cylindrical jet of water having diameter twice as diameter of spherical droplet, will have pressure difference equal to КРа.
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- A cylindrical tank 2m in diameter and 15 meters high is filled with liquid Z. A pressure gage at elev 10 m at the side of the tank reads 105 kPa. another gage at elev 6m reads 138 kPa. compute the (a) specific weight of the liquid and (b) density of the liquid.ROVINCE c). If the viscosity is 0.0126 stokes, what is the equivalent kinematic viscosity in m2/s? 3. If the velocity of water is 8 m/s and the pressure is 140 kPa on the discharge side of a pump, a) what will be the head of the pump if the velocity is 4 m/s and the pressure is 90 kPa on the suction side of the pump? b) how much power is required to drive it if the diameter of the suction side is 600 mm? c) If the pump is rated at 120 hp, what is the efficiency of the pump neglecting energy losses in the system? STATE 1969COMPUTE THE CAPILLARY RISE IN mm. OF PURE WATER AT 10^0 C EXPECTED IN A 0.8 mm θ TUBE
- Ex.1 Ans. A glass tube 0.25 mm in diameter contains a mercury column with water above the mercury. The temperature is 20°C at which the surface tension of mercury in contact with water is 0.037 kg()/m. What will be the capillary depression of the mercury? Take angle of contact 0= 130°. 3.02 cm28/2/202) 2 = Semester 1 Exar Students' classes = docs.google.com a 25.544 mm 21.014 mm Determine the horizontal and vertical components of the liquid pressure acting on the semicylindrical gate ABC, as shown in the figure. The width into the paper is 1 m. 1 m Liquid (s.g. = 0.88) 3.8 m 1 m2. An oil is flowing between two parallel horizontal plates which are 20 mm apart. The top plate is moving with a uniform speed 0.1 m/s. The viscosity of the oil is 0.1 N.s/m². The velocity at the centerline is 1.95 m/s. Consider the flow to be a fully developed one. a) Derive the velocity profile b) Calculate pressure difference between two points (Pi-P2) 5 m apart c) Find the velocity at 3 mm from the wall of the bottom plates. d) Find the velocity at 3 mm from the wall of the top plates. e) Determine force acting on the bottom wall, (W=10 cm) 0.1 m/s Oil P1 P2 2 cm y 5 m
- SITUATION B. An open tank containing brine (SG = 1.3) is accelerated vertically at 7.5 m/s2. Determine the pressure: 6. 1.5 m below the surface if the motion is upward with a negative acceleration 7. 2 m below the surface if the motion is downward with a negative acceleration12. A pipe contains an oil of sp. gr. 0.8. A differential manometer connected at the two points A and B of pipe shows a difference in mercury level as 20 cm. Find the difference of pressure at the two points (Ans. 25113.6 Nm] 13. A U-tube differential manometer connects two pressure pipes A and B. Pipe A contains carbon tetrachloride having a specific gravity 1.594 under a pressure of 11.772 N/cm and pipe B contains oll of sp. gr. 0.8 under a pressure of 11.772 N/em. The pipe A lies 2.5 m above pipe B. Find the difference of [Ans. 31.36 cm of mercury] 14. A differential manometer is connected at the two points A and B as shown in Fig, 2.25. At B air pressure [Ans, 6.91 Nicm) pressure measured by mercury as fluid filling U-tube. is 7.848 N/cm (abs.), find the absolute pressure at A. AIR WATER OIL Sp. gr.0.8 OIL Sp. gr. 0.8 50'cm I. 30'am 100 am 50 cm MERCURY Sp. gr.13.6 WATER Fig. 2.25 Fig. 2.26At 68 ˚F water has a dynamic viscosity of about 2.11 x 10 -5lb-s / ft2, solve the kinematic viscosity (in ft2/s) of water whose specific gravity is 0.998. Note ?????? =62.4 ??/??3 at normal condition.
- Assuming that pressure will increase at a uniform rate and there is no damping of the pressure wave. Water from a reservoir that flows through a 650mm pipe at 1.8m/s is completely stopped by a closure of a 160 m valve from the reservoir. The thickness of the pipe is 25mm, bulk modulus of water is 2.2x10⁹ Pa and E of steel is 1.4x10¹¹ Pa. Determine the following: a. Celerity of the pressure wave b. Equivalent bulk modulus of water c. Pressure on the pipe after closure of the valve d. Time required to avoid water hammer e. Water hammer pressure of the velocity will decrease to 1.2m/s f. Maximum permissible discharge after the outlet valve closure. ANSWER: d) t = 0.256 sec. e) Ph=pCAV = 749.8476 kPa f) Q = AV = 0.597 m³/s a) C = 1249.746m/s b) k' = 1.562x10⁹ Pa c) Ph=pCV = 2249.5428 kPa2 - Water is in a horizontal tube of length 250 m and diameter of 15 cm at a speed of 1.2 m/s. Note that the density of water is 1000 kg/m³ and a viscosity of 0.01 N.s/ m. Find the pressure difference along the length of the pipe? Note that the roughness modulus is 0.0000455. Water is siphoned from a large tank and discharges into the atmosphere through a 0.05 m diameter tube. The end of the tube is 0.9 m below the tank bottom, and the height of the tube is H = 2.0 m. 2.75 m %3D (a) Determine the volume flowrate from the tank. (b) Determine the water pressure at the top of the tube. (Assume viscous effects are negligible) I 0.9