A general Nusselt number correlation is presented for transverse cylinders in subsonic and supersonic air flows where dissociation is negligible. New and existing data in the following experimental range have been correlated: Mach M = 0.001 to 6.0, Reynolds NRe = 0.02 to 300,000, Knudsen NKn = 4 × 10−6 to 37. In subsonic flow, heat transfer from a cylinder yawed at an angle to the air velocity is predicted by the transverse cylinder Nusselt number correlation when the normal velocity component is used as the characteristic velocity. Finally, recovery temperature data from cylinders are divided into three regimes by a Knudsen number criterion.

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Hot-wire anemometer measurements of the turbulence parameters were made in a 3.5-in. diameter free jet at exit Mach numbers between 0.2 and 0.7 and Reynolds numbers (based on jet rad.) between 192 000 and 725 000. The results of these measurements show that (1) the intensity of turbulence is a maximum at a distance of approximately 1 jet rad. from the jet center line and decreases with increasing Mach and/or Reynolds number, and (2) the lateral and longitudinal scales of turbulence are nearly independent of Mach and/or Reynolds number and vary proportionally with distance from the jet nozzle. The lateral scale is much smaller than the longitudinal and does not vary with distance from the center line, while the longitudinal scale is a maximum at a distance from the center line of about 0.7 to 0.8 of the jet rad.

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