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Nomenclature g = acceleration body force t = time u = the x component of velocity x = distance measured along the tank wall from the position of the bulk liquid interface at t = 0 y = distance measured perpendicular to the tank wall 5 = thickness of draining film I JL = dynamic viscosity of liquid p = density of liquid PV = density of vapor

The thickness of a laminar liquid film draining from a vertical surface is found analytically under the assumption that the evaporation rate from the surface of the film is a known constant. The transient is studied as well as the steady solution. Expressions are found for the location where the film vanishes as well as for the rate of evaporation and total mass evaporated until any time.

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