Estimate the mass-transfer coefficient for moist air flowing normal to a 25 mm diameter tube (Nu = 0.615 Re0.47). The air velocity is 0.5 m/s. Assume standard air.
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Estimate the mass-transfer coefficient for moist air flowing normal to a 25 mm diameter tube (Nu = 0.615 Re0.47). The air velocity is 0.5 m/s. Assume standard air.
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- A thin liquid film of ammonia (NH3), which has formed on the inner surface of a tube of diame D= 10 mm and length L = 1 m, is removed by passing dry air through the tube at a flow rate m = 3 x 104 kg/s. The tube and the air are at 25°C. a) Calculate the velocity, the Reynolds number Rep and Sherwood's number Sc. b) What is the average mass transfer coefficient hm? (Hint: Use Table 14-13)Q 2- The Nusselt number for flow in a tube is given by Nu = C₁ Rea Prb where the constants, C1, a, and b are 0.023, 0.8, and 0.3, respectively. Estimate a mass-transfer coefficient for moist air flowing in a 30 cm tube with a diameter of 10 cm at the rate of 0.3 m3/s. Assume standard air, Prandtl number is 0.7 and unity Lewis number.What is the Reynolds number of a fluid flowing in a tube with an inside diameter of 1 inches? The viscocity is 1.353 x 10^ -5 lb/ft-s and the mass flow rate is 79 lb/h.Correct Answer: 24,780.96 ± 1%
- . Oil enters a 1.25-cm diameter,3-m long tube at 38°C. The tube wall is maintained at 66°C, and flow velocity is 0.3 m/s. What is the total heat transfer to the oil and oil exit temperature? Assume an exit temperature of 50°C. Temperature (°C) p(kg/m³) u (kg/m sec) Cp J/hg °C) k(W/m °C) 0.210 0.0725 0.0320 40 0.144 867.05 864.04 1964 60 2047 0.140 80 852.02 2131 0.138Consider pressurized water, engine oil (unused), and Nak (22%/78%) flowing in a 20-mm-diameter tube. (a) Determine the mean velocity, in m/s, the hydrodynamic entry length, in m, and the thermal entry length, in m, for each of the fluids when the fluid temperature is 366 K and the flow rate is 0.01 kg/s. (b) Determine the mass flow rate, in kg/s, the hydrodynamic entry length, in m, and the thermal entry length, in m, for water and engine oil at 300 and 400 K and a mean velocity of 0.022 m/s. Part A Determine the mean velocity, in m/s, the hydrodynamic entry length, in m, and the thermal entry length, in m, for each of the fluids when the fluid temperature is 366K and the flow rate is 0.01 kg/s. Liquid Um (m/s) Xfdh (m) Xfd,t (m) water i engine oil i i i Nak iCarbon dioxide at 300 K flows across one side of a flat plate at a velocity of 18 m/s. The plate measures 2.30 m in the direction of flow and 1.0 m wide. If the surface temperature is 400 K, find the convective heat transfer
- A 2-cm diameter, 10-m long tube transports water at an average flow velocity of 8 m/s. The water enters at 20°C and leaves at 30°C. To compute for the Nusselt number of the water flow, what is the exact value of the temperature in °C on which the water properties should be based?* Hot air enters a sheet metal đuct located in a basement. Determine the exit temperature and the rate of heat loss. Taking k 0.02735 W/m. C, v= 1.797x10 m'/s. Pr 0.7228, C-1007 J/kg.C ,pD MSc. Rasha Nasser 106 1.092 kg/m' H= 2.325 kg/m.s and e = 0.3 Ans: 45.1 °C, 2622 W Air dust 20 cm - 20 em Air L-12 mWhat is the Reynolds number of a fluid flowing in a tube with an inside diameter of 2 inches? The viscocity is 1.358 x 10^-5 lb/ft-s and the mass flow rate is 73 lb/h.
- You are designing an IC heatsink which uses round pins in cross-flow. The heatsink must dissipate 3000W. The heatsink has 10 rows of 8 columns of round pins with a diameter of 1mm. The pins have longitudinal and transverse pitch of 6mm. The incoming air is at 25oC with a velocity of 3 m/s. Assume fluid properties are constant. If the pins are arranged in-line: a) Find the Reynold’s Number b) Find the Nusselt Number c) If the pins are 30mm tall, how hot must the pin surface be (average) to dissipate the proper amount of heat?5b.please explain breifly in type form Describe the relation between fluid friction and heat transferBerlin, 1963, 67-77. 2B Problem 2: Average Velocity for Mass Balance in Flow down a Vertical Plate For a layer of liquid flowing in a laminar flow in the z direction down a vertical plate or surface, the velocity profile is: నgరా Where dis the thickness of the layer, x is the distance from the free surface of liquid toward the plate, and vz is the velocity at a distance x from the free surface. Consider the wall to have a depth of w in the y-direction and a length L in the z-direction. (a) Provide a sketch of the system described above with appropriate coordinates and origin point (b) What is the maximum velocity vz-max? Show that the expression you get has the units of velocity. (c) Derive the expression for the average velocity vz-av and relate that to Vz-max (d) Derive an expression for the total volumetric flow rate down the wall. Show that the expression you get has the units of m/s. (e) Calculate the shear acting on the x-surface at x=8. You are given the relationship between…