Heat Transfer
In an extended surface heat exchanger, fluid having lower co-efficient

Flows outside the tubes
Flows through the tube
Can flow either inside or outside the tubes
Should not be used as it gives very high pressure drop

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Heat Transfer
Nusselt number is the ratio of the

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

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