Question

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: (c).more than that for fluid flow.

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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

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