Question: Air at 1 atm flows at 2 m/s across the surface of a 2-in.-long surface that is covered with a thin film of water. If

Air at 1 atm flows at 2 m/s across the surface of a 2-in.-long surface that is covered with a thin film of water. If the air and water are maintained at 25oC, and the diffusivity of water in air at these conditions is 0.25 cm2/s, estimate the mass flux for the evaporation of water at the middle of the surface assuming laminar boundary layer flow. Is this assumption reasonable?

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