The equivalent diameter for the annulus of a double pipe heat exchanger, whose inner pipe has fins on the outside is ______________ compared to the same size pipes without fins?
Correct answer: B. Less
- A. More
- B. Less
- C. Same
- D. Unpredictable
Explanation
Equivalent diameter is four times the flow area divided by the wetted perimeter. External fins increase the wetted perimeter of the annular flow passage, so the equivalent diameter becomes smaller than for unfinned pipes.
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