M

Mr. Dubey • 52.30K Points
Coach 

Q. The Reynolds number is found out for a flow in a circular pipe. This circular pipe is moulded into a square pipe, keeping length of the pipe same. Ignore the thickness of the pipe. The Reynolds number changes by

(A) 57% decrease
(B) 57% increase
(C) 43% decrease
(D) 43% increase
Correct : Option (B)

Explanation: 
 the reynolds number directly depends upon the hydraulic diameter of the pipe. suppose the diameter of the pipe is d, the hydraulic diameter of square pipe is 1.57d. hence, 57% increase.

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