\(5\, cm\) ત્રિજ્યા ધરાવતી પાઇપમાથી પાણી \(100\,\) લિટર પ્રતિ મિનિટ ના દરથી આવે તો પ્રવાહનો રેનોલ્ડ નંબર કયા ક્રમનો હશે? (પાણીની ઘનતા \(= 1000\, kg/m^3\), પાણીનો શ્યાનતાગુણાંક \(= 1\, mPa\, s\))

A \(10^3\)
B \(10^6\)
C \(10^2\)
D \(10^4\)

Verified Solution

Answer & Solution

Correct Answer

(D) \(10^4\)

Step-by-step Solution

Detailed explanation

Reynolds number\( = \frac{{\rho vd}}{\eta }\) Volume flow rate\( = v \times \pi {r^2}\) \(v = \frac{{100 \times {{10}^{ - 3}}}}{{60}} \times \frac{1}{{\pi \times 25 \times {{10}^{ - 4}}}}\) \(v = \frac{2}{{3\pi }}m/s\) Reynolds number…

Apply the relevant identity from the chapter and substitute the values established in the previous step, keeping the original constraint in view.

Use the simplified expression to isolate the unknown, then plug the result back into the question setup to confirm the working is internally consistent.

Cross-check against a boundary or limiting case. Both the dimensional balance and the qualitative behaviour at the extreme should agree with the candidate answer.

Combine the steps above to identify the correct option. The remaining choices each fail at least one of the consistency, dimensional, or boundary checks.

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