A droplet of water (diameter 100 um) is falling through 20oC air at the terminal velocity of 0.298 m/s. The relative humidity of the air is 10% and the droplet is at the wet bulb temperature. The diffusivity of water vapor in air is 0.2 x 10-4 m2/s. (i) Estimate convective mass transfer coefficient. Viscosity of air: 18.24 × 10-6 Pa S Density of air: 1.19 kg/m3 (at 10% relative humidity)