Numerical analysis of the mixing of two gases in a microchannel

Author： Reyhanian M. Croizet C. Gatignol R.

E-ISSN： 2257-7750|14|6|453-460

ISSN： 2257-7777

Source： Mechanics & Industry, Vol.14, Iss.6, 2014-02, pp. : 453-460

Disclaimer: Any content in publications that violate the sovereignty, the constitution or regulations of the PRC is not accepted or approved by CNPIEC.

Previous Menu Next

Abstract

We present the results of a numerical simulation of a mixing process of two parallel streams of nitrogen (N₂) and carbon monoxide (CO), in a microchannel with a splitter plate mounted at the inlet. As an attempt to enhance mixing efficiency, bumps are added on the channel walls, downstream the splitter. Typically, in such a passive micro device, the gas flow is laminar, rarefied, and characterized by a Knudsen number in the range of about 0.01 to 0.5, that is in the transition flow regime. The Direct Simulation Monte Carlo (DSMC) method is employed to explore the influence of the bumps and the splitter plate, and to analyze the sensitivity of the gas mixing length to parameters such as the inlet velocity as well as the height and location of the bumps. For a selected range of parameters, quantitative analytical and numerical results are in very good agreement.