Heat transfer co-efficient equation for forced convection, Nu = 0.023 Re 0.8. Prn, is not valid, if the value of

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Q. Heat transfer co-efficient equation for forced convection, Nu = 0.023 Re 0.8. Prn, is not valid, if the value of

(A) n = 0.4 is used for heating
(B) n = 0.3 is used for cooling
(C) Reynolds number for the flow involved is > 10000
(D) Reynolds number for the flow involved is < 2100

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✅ Correct Answer: (D) Reynolds number for the flow involved is < 2100

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