Nusselt number is the ratio of the ____________________?
Correct answer: B. Heat flux at the wall to that across the entire pipe
- A. Temperature gradient of the wall to that across the entire pipe
- B. Heat flux at the wall to that across the entire pipe
- C. Temperature difference to the temperature gradient at the wall
- D. None of these
Explanation
The Nusselt number, Nu = hL/k, compares convective heat flux at a wall with the conductive heat flux through the fluid over the characteristic length. It therefore represents the enhancement of heat transfer caused by convection.
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