Dry air at 1 atm flows at 9 m/s across the surface of a 10-inch-long surface that is covered with a thin film of water. if the air and water are at 25 c and the diffusivity of water in air is 0.25 cm2/s, estimate the water flux in kmol/s*m2 for the evaporation of water at the middle of the surface, assuming laminar boundary-layer flow. air at 25c, viscosity 1.8 x 10-5 kg/m*s. vapor pressure of water 0.46 psia at 25 c =