In a double pipe (concentric) heat exchanger, the hydraulic radius for heat transfer (for a fluid flowing through the annulus) would be_________________?
Correct answer: C. More than that for fluid flow
- 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)
Explanation
For annular flow, the heat-transfer hydraulic radius is based on the heat-transfer surface, whereas the flow hydraulic radius uses the wetted perimeter of the annulus. Since the heat-transfer perimeter is normally smaller, the heat-transfer radius is larger.
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