The bottom of a steam-producing still of 200-mmdiameter is
Chapter 13, Problem 13.72(choose chapter or problem)
The bottom of a steam-producing still of 200-mmdiameter is heated by radiation. The heater, main- tained at 1000?C and separated 100 mm from the still,has the same diameter as the still bottom. The still bot-tom and heater surfaces are black.(a) By what factor could the vapor production rate beincreased if the cylindrical sides (dashed surface)were insulated rather than open to the surround- ings maintained at 27?C?(b) For heater temperatures of 600, 800, and 1000?C,plot the net rate of radiation heat transfer to thestill as a function of the separation distance overthe range from 25 to 100 mm. Consider the cylin-drical sides to be insulated and all other condi-tions to remain the same.
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