Abstract
Results of Couette flow investigation are given for the free-molecule flow regime as well as or the transitional one. The numerical solution of Boltzmann equation by the direct Monte Carlo simulation method is used in our paper for investigating the Couette flow in a wide range of values of plate temperatures ratio, Knudsen number and the upper plate velocity. The dependences of the energy flux transferred towards the lower plate, of the shear stress, and of the flux of normal momentum on the Knudsen number are considered. It is found that for any Mach number there exists the interval of plate temperatures ratios such that the energy flux towards the plate changes the sign if the Knudsen number increases, previously reaching a local extremum. It is demonstrated as well that the effect of nonmonotonicity at high Mach number is observed not only for the shear stress and the energy flux but for the normal momentum flux as well. We also found the cases where the energy flux varies monotonically or even has a deep negative minimum, but the shear stress has a maximum.
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