The local surface conductance for laminar film condensation on vertical surface is (where, t = film thickness) _________________?
Correct answer: B. ∝ 1/t
- A. ∝ t
- B. ∝ 1/t
- C. ∝ √t
- D. Independent of 't'
Explanation
For laminar film condensation, heat passes through the condensate film mainly by conduction, giving h approximately equal to k/t. Therefore, the local surface conductance varies inversely with film thickness.
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