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. 9,100
- A. 9,100
- B. 13,000
- C. 7,000
- D. 2,550
Explanation
For a given fluid, Reynolds number is proportional to velocity times pipe diameter: Re₂/Re₁ = 0.70 × 1.30 = 0.91. Thus, the new value is 0.91 × 10,000 = 9,100.
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