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chemical engineering process equipment and plant design
1. In a double pipe (concentric) heat exchanger, the hydraulic radius for heat transfer (for a fluid flowing through the annulus) would be
(A): D2 - D1 (D1 and D2 are I.D. of inner and outer pipes respectively).
(B): less than that for fluid flow.
(C): more than that for fluid flow.
(D): same as that for fluid flow.
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