The effects of outlet boundary conditions on simulating supersonic microchannel flows using DSMC

摘要: High speed gas flows through two-dimensional microchannels have been investigated using the Direct Simulation Monte Carlo (DSMC) method, where pressure boundary condition has implemented theory of characteristics as an alternative to vacuum boundary. Two species, nitrogen and helium, used conduct flow simulations. It was found that cannot only predict with exit-plane equal back pressure, which fails do, but can also simulate expansion waves outside channel. Therefore, it is considered be more appropriate. inlet Mach numbers, 4.15 3.39, employed for cases Knudsen number (Kn) 0.062. shown 4.15, effect on in latter half microchannel, wall heat flux enhanced by increasing pressure. At same trend higher case, though its magnitude considerably lower. In addition, no significant a step change temperature distribution total exchange between bulk detected