Air at 300 K and a flow rate of 3 kg/h passes upward through a 30-mm tube, as shown in the sketch. A thin film of water, also at 300 K, slowly falls downward on the inner surface of the tube. Determine the convection mass transfer coefficient for this situation.

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D = 30 mm Thin water film T = 300 K T = 300 K, m = 3 kg/h Air