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Question

Film coefficient is the ratio of ________ .

फिल्म गुणांक ________ का अनुपात है।

A.

thickness of film of fluid to thermal conductivity

B.

thickness of film of fluid to temperature drop through film of fluid

C.

thermal conductivity to temperature drop through film of fluid

D.

thermal conductivity to equivalent thickness of film of fluid

Answer ( Option D)

thermal conductivity to equivalent thickness of film of fluid

Solution

  • Film coefficient is defined as the ratio of thermal conductivity to the equivalent thickness of the film of fluid.
  • The heat transfers by convection per unit area per degree temperature difference between the surface and the fluid.

Hence, the correct option is (D).

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