A flat plate coated with a volatile substance (species
Chapter 7, Problem 7.116(choose chapter or problem)
A flat plate coated with a volatile substance (species A)is exposed to dry, atmospheric air in parallel flow withT??20?C and u??8 m/s. The plate is maintained at aconstant temperature of 134?C by an electrical heatingelement, and the substance evaporates from the surface.The plate has a width of 0.25 m (normal to the plane ofthe sketch) and is well insulated on the bottom.The molecular weight and the latent heat of vaporiza-tion of species A are ?A?150 kg/kmol andhfg?5.44106J/kg, respectively, and the mass dif-fusivity is DAB?7.7510?7m2/s. If the saturatedvapor pressure of the substance is 0.12 atm at 134?C,what is the electrical power required to maintainsteady-state conditions?
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