Authors: Qunwu He, Qiuwang Wang, Xian Wang, Laiqin Luo
Addresses: School of Energy and Power Engineering, Xi'an Jiaotong University, Xi'an, Shaanxi 710049, PR China. ' School of Energy and Power Engineering, Xi'an Jiaotong University, Xi'an, Shaanxi 710049, PR China. ' Interdisciplinary Graduate School of Engineering Sciences, Kyushu University, Kasuga-Koen 6-1, Kasuga, Fukuoka 816-8580, Japan. ' School of Energy and Power Engineering, Xi'an Jiaotong University, Xi'an, Shaanxi 710049, PR China
Abstract: Effective boundary condition is one of the most critical problems in the computation of micro-channel flows with direct simulation Monte-Carlo (DSMC) method. In the present work, the implementation of DSMC with specified pressure boundary condition (PBC) was discussed in detail. The variations of gaseous local pressure, temperature and number density of the particles caused by the temperature difference between channel walls and gas were presented. It was found that with the increase of both gaseous compressibility and rarefaction, the pressure distribution along micro-channel became more nonlinear. Heat transfer occurred almost only at channel inlet and outlet, and the average wall heat flux increased almost linearly to the inlet-to-outlet pressure ratio. The computational results also showed that PBC was more suitable for the simulation of micro-channel flow problems than the conventional velocity boundary condition (VBC).
Keywords: DSMC; micro-channel flow; low-speed gas flow; pressure boundary condition; PBC; velocity boundary condition; VBC; heat transfer; direct simulation Monte-Carlo method; gaseous compressibility; rarefaction; pressure distribution.
Progress in Computational Fluid Dynamics, An International Journal, 2005 Vol.5 No.3/4/5, pp.230 - 235
Published online: 05 Apr 2005 *Full-text access for editors Access for subscribers Purchase this article Comment on this article