For annular flow of a fluid, the ratio of the equivalent diameter for pressure drop calculation to the equivalent diameter for heat transfer calculation is_________________?
Correct answer: A. d1/(d1 + d2)
- A. d1/(d1 + d2)
- B. d2/(d1 + d2)
- C. (d1 + d2)/d1
- D. (d1 + d2)/d2
Explanation
For an annulus, the pressure-drop diameter is the hydraulic diameter, d2 − d1, while the heat-transfer diameter based on the inner surface is (d2 − d1)(d2 + d1)/d1. Their ratio therefore becomes d1/(d1 + d2), assuming d1 is the inner and d2 the outer diameter.
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