Heat Transfer
The Nusselt number for fully developed (both thermally and hydrodynamically) laminar flow through a circular pipe whose surface temperature remains constant is

Dependent on NRe only
3.66
1.66
88.66

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Heat Transfer
Nusselt number is the ratio of the

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

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