Investigation of Variation of Point Unit Heat-Transfer Coefficient Around a Cylinder Normal to an Air Stream

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Abstract
Most previous analytical and experimental work concerned with the variation of the rate of heat transfer around a cylinder normal to an air stream has been confined to one with an isothermal surface. It was therefore the purpose of the investigation described in this paper to obtain information on the variation of the rate of heat transfer around a cylinder with a nonisothermal surface. The method was suggested by a technique used in flight tests for determining point unit heat-transfer coefficients around airfoils. A thin nichrome ribbon wound helically around a cylinder was electrically heated. Point unit heat-transfer coefficients were determined from the temperature variation along, and electrical input to the ribbon. Results indicated the method would also be suitable for similar measurements around other streamlined shapes. The experimental data include point unit heat-transfer coefficient and static-pressure distributions around a cylinder circumference throughout a range of Reynolds modulus from 70,800 to 219,000. Comparison of these results with the skin-friction distributions around the cylinder indicated by the pressure distributions showed a definite correlation between the two. Results are also compared with those obtained by other investigators using an isothermal cylinder surface.

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