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Heat Transfer

Q1: Pick out the wrong statement.

A Heat transfer from a hot body to cold body by the emission of heat waves is called radiation:

B Filmwise condensation takes place on non-wettable surfaces.

C The boiling point of a solution is affected by liquid head as well as boiling point elevation.

D none of these.

ANS:B - Filmwise condensation takes place on non-wettable surfaces.

The wrong statement is: "Filmwise condensation takes place on non-wettable surfaces." In filmwise condensation, the condensate forms a thin, continuous film on the surface, promoting efficient heat transfer. This typically occurs on smooth, clean, and wettable surfaces, where the condensate spreads out uniformly. Non-wettable surfaces tend to promote dropwise condensation, where discrete droplets form and grow before shedding from the surface, which can lead to enhanced heat transfer compared to filmwise condensation. Therefore, filmwise condensation usually occurs on wettable surfaces, not non-wettable surfaces.



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