__________ is when nucleate boiling transforms to film boiling.

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Statement 1: Nucleate Boiling is when a layer of film is formed in the beginning. Statement 2: Boiling starts with the bottom layer which heats up, becomes light and goes up. That way everything becomes hot and there is not temperature difference and hence no heat transfer.

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Statement 1: When heat transfer takes between a solid surface and a fluid, an insulating film layer is formed. More is the agitation; more is the thickness of the film. Statement 2: Within the film, the temperature varies from the wall to the temperature of the bulk.

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According to Nusselt’s film theory, the film thickness decreases as we move from bottom to top. The heat transfer increases.

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Statement 1: In nusselt’s film theory, velocity of the falling film is not affected by the velocity of the vapors. Statement 2: LMTD can be used provided the overall heat transfer co-efficient is constant over a large range of temperatures.

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The reciprocal of heat transfer co-efficient is _____

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Which of the following is true about Natural Convection?

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