A thin sheet of naphthalene, 10 cm square is placed parallel to an air stream flowing at a uniform velocity of 5 m/s. The air is at 0°C and 101.3kN/m 2 pressure. Assuming that both the large surfaces...

A thin sheet of naphthalene, 10 cm square is placed parallel to an air stream flowing at a uniform velocity of 5 m/s. The air is at 0°C and 101.3kN/m²
pressure. Assuming that both the large surfaces are flat and exposed to the air at all times and neglecting evaporation from the edges, calculate the rate of sublimation of naphthalene. Under the operating conditions, vapor pressure of naphthalene is 7.86 × 10^–4
kN/m², diffusivity of air-naphthalene is 5.1 x 10^-6
m²/s.