3. 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: Nux 0.04Rex0.9 Pr1/3 where Nux 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. Answer: 1.11

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Chapter6: Forced Convection Over Exterior Surfaces
Section: Chapter Questions
Problem 6.21P
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3. 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:
Nux 0.04Rex0.9 Pr1/3
where Nux 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.
Answer: 1.11
Transcribed Image Text:3. 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: Nux 0.04Rex0.9 Pr1/3 where Nux 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. Answer: 1.11
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