Presence of a non-condensing gas in a condensing vapour___________________?
Correct answer: D. None of these
- A. Increases the rate of condensation
- B. Decreases thermal resistance
- C. Is desirable to increase the film co-efficient
- D. None of these
Explanation
A non-condensing gas accumulates near the condensing surface and adds mass-transfer and heat-transfer resistance. It therefore reduces the condensation rate rather than increasing the coefficient, so none of the first three statements is correct.
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