When evaporation takes place at the liquid-vapor interface, the heat transfer is solely due to free convection and the film coefficient follows the relation

When evaporation takes place at the liquid-vapor interface, the heat t

1.	When evaporation takes place at the liquid-vapor interface, the heat transfer is solely due to free convection and the film coefficient follows the relation
A.	Nu = f <sub>1</sub> (G r) f<sub> 2 </sub>(P r)
B.	Nu = 2 f <sub>1</sub> (G r) f<sub> 2 </sub>(P r)
C.	Nu = 3 f <sub>1</sub> (G r) f<sub> 2 </sub>(P r)
D.	Nu = 4 f <sub>1</sub> (G r) f<sub> 2 </sub>(P r)
Answer» B. Nu = 2 f <sub>1</sub> (G r) f<sub> 2 </sub>(P r)

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When evaporation takes place at the liquid-vapor interface, the heat transfer is solely due to free convection and the film coefficient follows the relation

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