The equivalent diameter for flow through a rectangular duct of width B and height H is___________________?
Correct answer: C. 2HB/(H + B)
- A. HB/2 (H + B)
- B. HB/(H + B)
- C. 2HB/(H + B)
- D. 4HB/(H + B)
Explanation
Equivalent diameter is defined as 4A/P, where A = BH and the wetted perimeter is P = 2(B + H). Therefore, D_e = 4BH/[2(B + H)] = 2BH/(B + H).
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