Air at atmospheric pressure and 27oC is blown across a long 4.0-cm diameter tube at a velocity of20 m/s. Determine the heat transfer rate per unit length. Assume that the temperature of the wall is 60oC
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Air at atmospheric pressure and 27oC is blown across a long 4.0-cm diameter tube at a velocity of20 m/s. Determine the heat transfer rate per unit length. Assume that the temperature of the wall is 60oC.
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- Air enters a 25-cm-diameter 12-m-long underwater duct at 50°C and 1 atm at a mean velocity of 7 m/s, and is cooled by the water outside. If the average heat transfer coefficient is 85 W/m2?K and the tube temperature is nearly equal to the water temperature of 10°C, determine the exit temperature of air and the rate of heat transfer. Evaluate air properties at a bulk mean temperature of 30°C. Is this a good assumption?Combustion gases passing through a 3-cminternal- diameter circular tube are used to vaporize waste water at atmospheric pressure. Hot gases enter the tube at 115 kPa and 250°C at a mean velocity of 5 m/s, and leave at 150°C. If the average heat transfer coefficient is 120 W/m2?K and the inner surface temperature of the tube is 110°C, determine (a) the tube length and (b) the rate of evaporation of water.Air at 1 atmosphere and a temperature of 60f enters 1/2-in. id tube with a velocity of 80 fps. The wall is maintained at a constant temperature of 210 by condensing steam. Fin the convective heat-transfer coefficient for this situation if the tube is 5ft long