A heater element of 5-mm diameter is maintainedat a
Chapter 10, Problem 10.33(choose chapter or problem)
A heater element of 5-mm diameter is maintainedat a surface temperature of 350C when immerse horizontally in water under atmospheric pressure.The element sheath is stainless steel with a mechanically polished finish having an emissivity of 0.25.(a) Calculate the electrical power dissipation and therate of vapor production per unit heater length.(b) If the heater were operated at the same powerdissipation rate in the nucleate boiling regime,what temperature would the surface achieve? Calculate the rate of vapor production per unit lengthfor this operating condition.(c) Sketch the boiling curve and represent the two operating conditions of parts (a) and (b). Compare theresults of your analysis. If the heater element isoperated in the power-controlled mode, explain howyou would achieve these two operating conditionsbeginning with a cold element.
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