A 20-mm-diameter sphere is suspended in a dry airstream
Chapter 6, Problem 6.75(choose chapter or problem)
A 20-mm-diameter sphere is suspended in a dry airstream with a temperature of 22C. The power sup-plied to an embedded electrical heater within the sphere is 2.51 W when the surface temperature is 32C. Howmuch power is required to maintain the sphere at 32C ifits outer surface has a thin porous covering saturated with water? Evaluate the properties of air and the diffusion coefficient of the airwater vapor mixture at 300 K.
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