Question

A well located in the desert is 10 m deep to the water level and 1.0 m in diameter. The stagnant air and water in the well are at 30 0C and normal atmospheric pressure. A slight breeze of dry air is blowing across the top of well. Calculate the rate of steady-state diffusion of water vapour in the well. (Assume partial pressure of water vapour in the air = vapour pressure of water at 30 0C). Diffusivity of water vapour in air at 30 0C is DAB = 2.6*10-5 m2/sec. Vapour pressure of water at 30 0C = 4.112 kN/m2.

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