In a double pipe (concentric) heat exchanger, the hydraulic radius for – McqOptions

MCQOPTIONS

1.	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» D. D2 – D1 (D1 and D2 are I.D. of inner and outer pipes respectively)

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