Abstract
A correlation is made of heat-transfer data for circular cylinders of high thermal conductivity in the Reynolds number range 2 × 10 -2 < Re o < 10 3 and the Mach number range M > 0.2. The Nusselt number is found to vary monotonically from the continuum heat-transfer law Nu ∼ Re 1 2 at high Reynolds numbers to Nu ∼ Re in free-molecule flow. The normalized recovery temperature is found to be a function only of the free-stream Knudsen number for Mach numbers greater than 0.6, and a method of estimating the recovery temperature for all Mach numbers is proposed. Empirical formulas are presented for the Nusselt number, recovery factor, and slope of the Nu-Re correlation. The results indicate a free-molecule flow energy accommodation coefficient near unity.
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