In a double pipe (concentric) heat exchanger, the hydraulic radius for heat transfer (for a fluid flowing through the annulus) would be
A. Same as that for fluid flow
B. Less than that for fluid flow
C. More than that for fluid flow
D. D2 - D1 (D1 and D2 are I.D. of inner and outer pipes respectively)
Answer: Option C
This Question Belongs to Chemical Engineering >> Process Equipment And Plant Design
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