An average Nusselt number in laminar natural convection from a vertica – McqOptions

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1.	An average Nusselt number in laminar natural convection from a vertical wall at 180°C with still air at 20°C is found to be 48. If the wall temperature becomes 30°C, all other parameters remaining same, the average Nusselt number will be
A.	16
B.	8
C.	24
D.	32
Answer» D. 32

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