Abstract
We consider subsonic, transonic, and moderate supersonic rarefied monatomic gas flows past a flat plate at zero angle of attack in the transitional regime. The influence of the rarefaction on the flow pattern is investigated mainly by the direct simulation Monte Carlo method. We study the shear stress, normal momentum flux transferred to the plate, and energy flux transferred to the plate at various Knudsen numbers, Mach numbers, and plate temperatures. We show that if the plate temperature is equal to the temperature of the undisturbed gas, then at any Mach number of the incoming flow, the average dimensionless normal momentum transferred to the plate has at least one extreme with respect to the Knudsen number. Specifically, in the supersonic and sonic cases, these dependences have a maximum. In the case of subsonic transonic Mach number M = 0.8, the dependence has a weak maximum and a weak minimum. At M = 0.5, it has weak minimum. We show that in a wide temperature range at subsonic and moderate supersonic Mach numbers in the transitional regime, the plate temperature very weakly affects the average friction force acting on the plate. We show that there exist certain intervals of plate temperatures ratios and Mach numbers such that the average dimensionless energy flux transferred to the plate changes the sign if the Knudsen number increases, previously reaching a local negative minimum.
Published Version
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