Paper VT-TuM5
Mixture Flow of Rarefied Gases through a Thin Orifice Over the Whole Range of Gas Rarefaction
Tuesday, November 11, 2014, 9:20 am, Room 303
Rarefied gas flow through a thin orifice is well studied on the basis of the direct simulation Monte Carlo (DSMC) method, see e.g. Ref.[1,2]. In spite of the fact that in practice one deals with gaseous mixtures more often than with a single gas, the information about such kind of flows is still poor. That is why it is attractive to treat gaseous mixtures as a single gas with the molecular mass equal to its average values of the corresponding mixture. However, such an approach not always provides reliable results. The aim of the present work is a numerical modeling of mixture flows of rarefied gases through a thin orifice on the basis of the direct simulation Monte Carlo (DSMC) method. The mass flow rate and flow field are calculated over the whole range of the rarefaction parameter for various values of the pressure ratio and for several values of the mole fraction. A comparison of the present numerical results with those obtained for a single gas is performed. A recommendation of the applicability of single gas results to gaseous mixture is given. References
1. F. Sharipov, Numerical simulation of rarefied gas flow through a thin orifice. J. Fluid Mech. Vol.518, pp. 35-60 (2004).
2. F. Sharipov and J.L. Strapasson, Ab initio simulation of rarefied gas flow through a thin orifice. accepted in Vacuum.