How does the heat transfer coefficient K change?
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In a shell-and-tube condenser, air flows inside the tubes while saturated water vapor flows between them. If the steam pressure and the temperature at the air inlet remain constant, then as the air flow rate increases, the heat transfer coefficient K should ( ) A. increase； B. Reduce ； C. Basically unchanged. (Please attach the specific derivation process, thank you :) )
C is mainly because the condensation heat transfer coefficient is very large.
A increases; at this point, K mainly depends on the convective heat transfer coefficient of the air inside the tube