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

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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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