An analytical method is presented for studying the compressible boundary-layer motion over a rotating disk including axial forced flow. Some existing incompressible flow data can be utilized. The range considered includes free-molecule flow, slip flow, and high-density gas flow. A new correlation for treating disk-friction data is suggested. General aspects of friction and heat transfer are discussed. Results suggest the rotating disk as a suitable tool for experimental study of mechanics of a rarefied gas.

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