Zhou Jing,Tao Wenquan
(State Key Laboratory of Multiphase Flow in Power Engineering,Xi'an¡¡Jiaotong¡¡University,Xi'an 710049,China)
Abstract:The gas flow with low inlet velocity in micro parallel plate channel was simulated with direct simulation Monte Carlo £¨DSMC£© method.The inlet and outlet boundaries for pressure were dealt with mass conservation condition.The Knudsen number varies from 0.05 to 1.00 and covers the slip,transition,and free molecule regions.Two cases were considered£¬ i£®e£®£¬ the inlet fluid and plates having the same temperature and the fluid heated by the plates symmetrically£® The effects of rarefaction and compressibility on the flow and heat transfer characteristics are analyzed.The simulation results show that£º ¢Ù With the increase of Knudsen number,the non-linearity of pressure distribution deceases,and the streamwise variation of both the velocity and temperature reduces£» ¢Ú The variations of temperature at the channel inlet and outlet are significant£» ¢Û The heat transfer between the channel and the gas is mainly concentrated in the inlet and outlet regions while the heat transfer process is rather weak in the middle part of the channel£®
Keywords£ºDSMC method;micro-scale channel;subsonic;heat transfer