In a double pipe (concentric) heat exchanger, the hydraulic radius for heat transfer (for a fluid flowing through the annulus) would be

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Ram Sharma

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📊 Process Equipment And Plant Design

Q. 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)

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✅ Correct Answer: (C) More than that for fluid flow

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