Abstract
A new method is described for approximating the creeping motion aerodynamic drag on nonspherical bodies over the full range of Kn. The method comprises calculating the size of the “adjusted sphere” which has the same slip correction factor C as the nonspherical body in free molecular flow. The adjusted sphere also has the same C in continuum flow, since C is always unity for this case, and thus the slip correction factor of the adjusted sphere approximates that of the nonspherical body over the full Kn range. To use the method, expressions for aerodynamic drag are required for the nonspherical body for both continuum and free molecule flow. These expressions are listed for several bodies in the first two papers of this series. The new method is tested by comparing it with the expression of Pich for drag on infinite cylinders and is found to be accurate for this case over the whole range of Kn. The method is simple and general and applicable to a wide variety of aerodynamic drag calculations and may also be valuable in calculations of heat and mass transfers. Aerodynamic drag results for several nonspherical bodies in various orientations are given.
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