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Question

Inspite of large heat transfer coefficients in boiling liquids, fins are used advantageously when the entire surface is exposed to________ .

A.

nucleate boiling

B.

film boiling

C.

transition boiling

D.

all modes of boiling

Answer ( Option B)

film boiling

Solution

Nucleate boiling:It is actually the type of boiling in which the surface temperature is more than the generally saturated fluid temperature . This happen in the condition when the critical heat flux remains higher than the heat flux . The surface temperature only greater by certain amount.

Film boiling: In this type of boiling the surface temperature remains much higher even the  wall are not be able to  contact with the liquid instead covered with the help of vapour. This is why it also have the low heat transfer capacity. 

Transition boiling :It is defined as the unstable boiling, which occurs at surface temperature between maximum temperature nucleate boiling and minimum temperature of film boiling.

               

Hence, the correct option is (B).

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