Reynolds number of a fluid flowing in a circular pipe is 10,000. What will be the Reynolds number when the fluid velocity is decreased by 30% & the pipe diameter is increased by 30% ?
Correct answer: A
Explanation
Reynolds number (Re) is proportional to velocity (V) and diameter (D). New Re = Old Re * (1 - 0.30) * (1 + 0.30) = 10,000 * 0.7 * 1.3 = 9,100.