Question: Experimental results for heat transfer over a flat plate with an extremely rough surface were found to be correlated by an expression of the form

Experimental results for heat transfer over a flat plate with an extremely rough surface were found to be correlated by an expression of the form Nu x = 0.04Rex0.9 Pr1/3 where Nu x is the local value of the Nusselt number at a position x measured from the leading edge of the plate. Obtain an expression for the ratio of the average heat transfer coefficient hx to the local coefficient hx.

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