The equivalent diameter for fluid flow through a channel of constant non-circular cross section of area 'A' is given by (where, P = perimeter of the channel in contact with the fluid) ?
Correct answer: A. 4 A/P
- A. 4 A/P
- B. A/P
- C. 4 P/A
- D. √A
Explanation
For a non-circular channel, the hydraulic or equivalent diameter is defined as D_e = 4A/P, where P is the wetted perimeter. The factor four makes the expression reduce to the actual diameter for a circular pipe.
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