A 1 x1 m plate of solid naphthalene is oriented parallel to a stream of air flowing at 0.3
m/s. The air and the plate are at 300K and 1 atm. pressure. Use analogy between mass and
momentum transfer to calculate the rate of sublimation from the plate.

The diffusivity and vapour pressure of naphthalene in air at these conditions are 5.9 x 10-4 m2/s and 0.2 mmHg.