Equivalent diameter for heat transfer calculation for a duct of square cross-section having each side as 'd' will be__________________?
Correct answer: A. d
- A. d
- B. √d
- C. √(2πd)
- D. √(2d)
Explanation
The equivalent diameter is 4A/P, where A is flow area and P is wetted perimeter. For a square duct, 4(d²)/(4d) equals d.
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