Total rate of vapor transfer from a tube

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1. Consider gas flow of mass density and rate m· through a tube whose inner surface is coated with a liquid or a sublimable solid of uniform vapor density pA,s. Derive Equation 8.86 for variation of the mean vapor density, pA,m, with distance from the tube entrance and Equation 8.83 for the total rate of vapor transfer from a tube of length L.

2. Atmospheric  air  at  25°C  and  3 X 10-4  kg/s  flows through  a  10-mm-diameter,  1-m-long  circular  tube whose inner surface is wetted with a water film. Deter- mine the water vapor density at the tube outlet, assum- ing  the  inlet  air  to  be  dry.  What  is  the  rate at  which vapor is added to the air?

Reference no: EM13946117

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