Nusselt number is the ratio of the

1.	Nusselt number is the ratio of the
A.	temperature gradient of the wall to that across the entire pipe.
B.	temperature difference to the temperature gradient at the wall.
C.	heat flux at the wall to that across the entire pipe.
D.	none of these
Answer» D. none of these

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Nusselt number is the ratio of the

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