If air (a non-condensing gas) is present in a condensing vapor stream, it will ______________ the condensation rate of vapor?
Correct answer: B. Decrease
- A. Increase
- B. Decrease
- C. Not affect
- D. Increase the condensing film co-efficient as well as
Explanation
Air adds a diffusion resistance between the condensing vapor and the cooling surface, reducing the effective condensation rate. It does not enhance the condensing film coefficient, so the rate decreases.
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