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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- 6.1 Determine the heat transfer coefficient at the stagnation point and the average value of the heat transfer coefficient for a single 5-cm-OD, 60-cm-long tube in cross-flow. The temperature of the tube surface is , the velocity of the fluid flowing perpendicular to the tube axis is 6 m/s, and the temperature of the fluid is . Consider the following fluids: (a) air, (b) hydrogen, and (c) water.Compare the frictional pressure drop, due to skin friction, of air and water for a smooth circular pipe of inside diameter D and length L. For this comparison, consider the mass flow rate of air to be equal to the mass flow rate of water [Ans.: Using the McAdams’ correlation for f we find, ∆Pa/∆Pw = (ρw/ρa)1.2].Hot air (43 °C) at 1 atm flows into a circular plastic duct 50 m long at a rate of 0.2 m3/s. If the friction loss, hL, in the pipe does not exceed 6 m. Determine the diameter of the duct, the velocity of the fluid, and the Reynolds number.
- 1) Atmospheric air at 25oC and with a speed of 50 m/s is pumped by a fan over a flat plate. a)What is the minimum plate length in order to achieve a Reynolds number of 108 ? b)At what distance from the leading edge would transition occur if critical Re #= 5x105 ? 2) Local Nusselt number is given as Nux=0.04Rex0.9 Pr 1/3. Obtain an expression for, a) average heat transfer coefficient, x b) local heat transfer coefficient, hx c) What is the ratio of the average to local coefficient, x / hx 3) Air is in parallel flow over a flat heater surface which is to be maintained at 140oC. Airflow induces a drag force of 0.25 N on the heater. What is the electrical power needed to maintain the prescribed surface temperature? 4) Air at 1 atm with a velocity of 4 m/s and a temperature of 50oC flows over a flat plate that is at a uniform temperature of 100oC. The plate has a length of 0.20 m and a width of 0.1 m. a) What is the average heat…For these velocity distributions in a round pipe, indicate whether the kinetic-energy correction factor ∝ is greater than, equal to, or less than unity.Agas at 0°C and avelocity of 2.5 m/s, flows over a 1.2 m long, 2m wide plate that is maintained at 80°C. If the gas properties are: Density = 1.142 kg/m3 , cp = 1.04 kJ/kg.K, ν= 15.63×10 -6m2 /s, k = 0.0262 W/m.K,and Pr= 0.708,determine: (a)The critical length of the flow[m] (b)The average heat transfer coefficient[W/m2 .K] (c)Total rate of heat transfer from the plate[W]
- Water at 70 °F is to be passed through a 1 micron-thick, porous PE membrane of 25% porosity with an average pore diameter of 0.3 micron and an average tortuosity of 1.3. The pressure on the downstream and upstream sides of the membrane are 125 and 500 kPa, respectively. Estimate the flow rate of water through the membrane.QS: Water at 15.56°C i to be heated in a 2-mm-ID tube until the exit temperature reaches 26.67+C. The tube wall temperature is maintained at 48.99-C and the inlet flow velocity is 0.3 m/s. Calculate the length of tube required in meters to accomplish this heating. Also calculate the total heating required, expressed in watts. Answers: L=0.13 mFor a fixed compressor inlet velocity and flow area, explain the effect of increasing compressor inlet temperature (i.e., summertime operation versus wintertime operation) on the inlet mass flow rate and the net power output with all other parameters of the problem being the same.
- Agas at 0°C and avelocity of 2.5 m/s, flows over a 1.2 m long, 2 m wide plate that is maintained at 80°C. If the gas properties are: density= 1.142 kg/m3, cp= 1.04 kJ/kg.K, ν= 15.63×10–6m2/s, k = 0.0262 W/m.K,and Pr= 0.708,determine:(a)The critical length of the flow[m](b)The average heat transfer coefficient[W/m2.K](c)Total rate of heat transfer from the plate[W]Ex: A combustion chamber consists of tubular combustors of 15-cm diameter. Compressed air enters the tubes at 550 K, 480 kPa, and 80 m/s. Fuel with a heating value of 42,000 kJ/kg is injected into the air and is burned with an air–fuel mass ratio of 40. Approximating combustion as a heat transfer process to air, determine the temperature, pressure, velocity, and Mach number at the exit of the combustion chamberWhat are the basic parameters for calculating of Jet Pulse Compress Air for cleaning of bags from dust in Bag Filters and Bag Houses?