Wind tunnel measurements of sphere drag at supersonic speeds and low Reynolds numbers
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Sphere drag has been measured in a low-density supersonic wind tunnel by a simple displacement technique. A conical nozzle of fixed geometry, operated at a constant supply temperature of about 300 °K was used. Test section Mach numbers ranged between 3.8 and 4.3 depending on supply pressure. The Reynolds number and Knudsen number range, based on free-stream conditions and sphere diameter, were 50 Re ∞ Kn ∞ C D = 1·17 at Re ∞ = 1000 to C D = 1·73 at Re ∞ = 50.
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[3] M. Heineman. Theory of drag in highly rarefied gases , 1948 .