Question: Obtain by dimensional analysis a functional relationship for the wall heat-transfer coefficient for a fluid flowing through a straight pipe of circular cross-section. Assume that

Obtain by dimensional analysis a functional relationship for the wall heat-transfer coefficient for a fluid flowing through a straight pipe of circular cross-section. Assume that the effects of natural convection can be neglected in comparison with those of forced convection.

It is found by experiment that, when the flow is turbulent, increasing the flowrate by a factor of 2 always results in a 50% increase in the coefficient. How would a 50% increase in density of the fluid be expected to affect the coefficient, all other variables remaining constant?

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