A

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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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