In pipe flow, heat is transferred from hot wall to the liquid by

1.	In pipe flow, heat is transferred from hot wall to the liquid by
A.	conduction only.
B.	forced convection only.
C.	forced convection and conduction.
D.	free and forced convection.
Answer» D. free and forced convection.

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In pipe flow, heat is transferred from hot wall to the liquid by

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