Consider a situation when evaporation takes place at the liquid-vapour – McqOptions

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1.	Consider a situation when evaporation takes place at the liquid-vapour interface in which the heat transfer is mainly due to free convection then the Nusselt Number for the film follows which one of the following relation?
A.	Nu = F<sub>1</sub> Gr F<sub>2</sub> Pr
B.	Nu = 4 F<sub>1</sub> Gr F<sub>2</sub> Pr
C.	Nu = 2 F<sub>1</sub> Gr F<sub>2</sub> Pr
D.	Nu = 3 F<sub>1</sub> Gr F<sub>2</sub> Pr
Answer» B. Nu = 4 F<sub>1</sub> Gr F<sub>2</sub> Pr

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