The diameter of droplet is 0.075 mm. What is the intensity of the pressure (N/sq. cm) developed in the droplet by surface tension of 0.000075 N/mm?
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- 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 kPa15. If the pressure in pipe A is 6 kPa, the SG = 0.85 pressure in pipe B =. ........... psig. Water 90 mm 30% a. 1.27 70 mm b. 8.73 40 mm C. 60.17 SG = 13.6 Mercury d. None of all theseThe velocity profile of water(density 1000 kg/m and viscosity of 0.001 N.S/m² ) in a pipe is u%=²(R² -r²) where R is radius of the pipe and r is any distance from the center of the pipe. %3D The roughness of the pipe is 0.03 mm. i. If the pipe is replaced by another pipe with higher roughness of 0.075 mm, Calculate the pressure drop in two-meter length of the pipe. ii. evaluate the pressure drop in two-meter. ii. Explain your answers (difference or similarity) in parts (i) and (ii).
- 28/2/202) 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 m. Determine the surface tension in a tube with 0.2m radius and wetting angle 80 and capillary rise of 5mm in N/m and in lb/ft.Given the bulk modulus of water B-2.1x1o° Pa= 2.1 GPa, What increase in pressure needs to be applied to the surfaces of a cube of water 1 m on a side to reduce its volume by 4%? O a 0.0600 GPa Ob. None. O c.0840 GPa O d. 0.0700 GPa O e 0.1050 GPa
- This is a mercury U-tube*acceleration = 4.905 m/s^2 to the right What is the gage pressure at A? in kPaOil flows through a circular pipe at a rate of 0.4m^3/s. Density p= 960kg/m3 Length of Pipe = 120m Head loss along the length = 7m Roughness of the pipe, ks = 0.07mm Kinematic viscosity v= 2 x 10^(-5) m2/s Find the diameter of the pipe to 3dp. (The final solution should be 0.34m, but i am confused with the method so if you could put a few notes next to calculations that would be very helpful). Ive attached a copy of the moody diagram aswell as it is relevant.A capıllary glass tube of 0.1 mm internal diameter is immersed vertically in a beaker full of waten Assuming the tube to be perfectly clean and wet, determine the height of the capillary rise of water in the tube when the room tamp is 20°C. Given at 20°C unit weight of water = 0.9980 gm/cc and surface tension 72.8 dyne/cm. %3D
- The diameter of a pipe carrying oil (s=0.92) changes gradually from 400 mm at A to 600 mm at B. Point A is 3.6 m lower than B. If the pressure at A is 70 KPa and that at B is 49 KPa when 140 L/s is flowing, determine the direction of flow; (b) the frictional loss between the two points.The compressible flow is assumed to be..?A head reading of 827 mm Hg (abs) is being compared to 1.73 m H2O (gauge). Which of these is true? A. The pressure in the first reading is larger than the second one.B. The pressure in the first reading is lower than the second one.C. The two pressures are equal.D. Insufficient data to conclude.