The film co-efficient between condensing vapour and metal wall increases with
A. Increasing temperature of the vapour
B. Decreasing temperature of the vapour
C. Increasing viscosity of the film of condensate
D. Increasing temperature drop
Answer: Option A
This Question Belongs to Chemical Engineering >> Heat Transfer
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option B is correct because h is increases with decreases in Temp. drop ( Tv - Tw )^(1/4) .
Since, Tv vapor Temp. must be decreases for increase in h .