For a fluid flowing in an annulus space, the wetted perimeter for heat transfer and pressure drop are__________________?
Correct answer: B. Different
- A. Same
- B. Different
- C. Never different
- D. Linearly related
Explanation
In an annulus, the pressure-drop wetted perimeter includes every wall in contact with the fluid, whereas the heat-transfer perimeter depends on the heated surface. Thus, under the usual one-surface heating arrangement, the two perimeters are different.
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