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Heat transfer co-efficient equation for forced convection, Nu = 0.023 Re0.8 . Prn, is not valid, if the value of
Options:
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
Answer: Option D
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