عنوان مقاله [English]
In this paper, by using a new combinatory meshing technique in axisymmetric coordinate, a solver of MCC-DSMC is introduced. Using this solver, the flow and concentration variation inside a centrifuge machine in a rigid body rotation mode with the DSMC method for variable hard sphere and variable soft sphere models and for the mixing hydrogen, argon and krypton gases are investigated. The results are compared with the analytical solution. The results indicate that the two collision models have a high agreement with each other, but their results have some differences with the analytical results obtained from the Boltzmann distribution function. The results show that the presence of several gases with different molecular weights in a centrifuge, is shaped multi-layered radial flow of gases inside the rotor so that the heaviest gas in the area of the side wall of the rotor, the lightest gas in the region near the axis the rotors and gases of with medium molecular mass are placed in a layer between them. In this study, the variation of concentration for each component of the mixing gases in axial direction is also investigated by using DSMC method, so that it is impossible to investigate it using the analytical solution of the Boltzmann distribution function.