Dry air at 35C and a velocity of 10 m/s flows over
Chapter 8, Problem 8.122(choose chapter or problem)
Dry air at 35C and a velocity of 10 m/s flows over athin-walled tube of 20-mm diameter and 200- mmlength, having a fibrous coating that is water-saturated.AirT= 35CV= 10 m/sWaterm,Tm,iSaturated surface conditionTs = 27C o maintain an approximately uniform surface tem-perature of 27C, water at a prescribed flow rate andtemperature passes through the tube.(a) Considering the heat and mass transfer processeson the external surface of the tube, determine theheat rate from the tube.(b) For a flow rate of 0.025 kg/s, determine the inlettemperature, Tm,i, at which water must be suppliedto the tube.
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