Bulk of the convective heat transfer resistance from a hot tube surface to the fluid flowing in it, is __________________?
Correct answer: A. Mainly confined to a thin film of fluid near the surface
- A. Mainly confined to a thin film of fluid near the surface
- B. Uniformly distributed throughout the fluid
- C. In the central core of the fluid
- D. None of these
Explanation
Near a solid-fluid interface, the fluid velocity falls to zero and a strong temperature gradient develops across a thin boundary film. This thin film therefore contains most of the convective heat-transfer resistance.
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