Heat Transfer
Critical value of the __________ number governs the transition from laminar to turbulent flow in free convection heat transfer.

Grashoff
Both A & B
Prandtl & Grashoff
Reynolds

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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
None of these
Temperature difference to the temperature gradient at the wall

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