Heat Transfer
A measure of the extent to which viscous heating is important relative to the heat flow resulting from the impressed temperature difference is represented by the __________ number.

Brinkman
Stantan
Grashoff
Condensation

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Heat Transfer
Nusselt number is the ratio of the

Temperature gradient of the wall to that across the entire pipe
Temperature difference to the temperature gradient at the wall
Heat flux at the wall to that across the entire pipe
None of these

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