CYLINDER DRAG IN THE TRANSITION FROM CONTINUUM TO FREE MOLECULE FLOW
CALIFORNIA UNIV BERKELEY INST OF ENGINEERING RESEARCH
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The drag coefficients for cylinders normal to the flow have been determined experimentally at approximately Mach 2, 4, and 6 with Knudsen numbers extending from continuum conditions to free molecule flow conditions. The results indicate a smooth transition from inviscid values at low Knudsen numbers to free molecule flow predictions for diffuse reflections at high Knudsen number. Small departure theories which are applicable to the near free molecule flow regime are compared to the experimental data.