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Question

In regarding nucleate boiling ________ .

A.

the temperature of the surface is greater than the saturation temperature of the liquid

B.

bubbles are created by expansion of entrapped gas or vapour at small cavities in the surface

C.

the temperature is greater than that of film boiling

D.

all options are correct

Answer ( Option C)

the temperature is greater than that of film boiling

Solution

Nucleate boiling in a type of boiling that takes place when the surface temperature is hotter than the saturated fluid temperature by a certain amount but where the heat flux is below the critical heat flux. The graphs shown below,

Nucleate boiling occurs when the surface temperature is higher than the saturation temperature (TSby between 10to 300C.

Hence, the correct option is (C).

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