Numerical study of rarefied gas flows in microchannels with oscillating elements

25th International Conference on Vacuum Technique and Technology

Kosyanchuk, V.V.^1,2,3 ; Yakunchikov, A.N.^1,2,3

Faculty of Mathematics and Mechanics, Lomonosov Moscow State University, Moscow

119991, Russia^1

Institute of Mechanics of Lomonosov, Moscow State University, Moscow

119192, Russia^2

Mechanical Engineering Research Institute, Russian Academy of Sciences, Moscow

101990, Russia^3

关键词: Collision-free;    Forced harmonic motions;    Gas separations;    High frequency HF;    High frequency oscillations;    Molecular dynamics methods;    Oscillating boundaries;    Rarefied gas flow;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/387/1/012042/pdf
DOI  :  10.1088/1757-899X/387/1/012042

来源: IOP

【 摘 要 】

This paper present a numerical study of a free-molecular (Kn >10) gas flow in two devices with high-frequency oscillating boundary: (1) flow in plane channel with a series of oscillating barriers. (2) flow in a channel with wall performing forced harmonic motion. All calculations were performed using simplified collision-free version of Event-Driven Molecular Dynamics method (EDMD). It was shown that high-frequency oscillations have a significant influence on the gas flow, and this influence depends on molecules characteristic thermal speed. Thus it was shown, that this influence will be different for gases with different molecular masses, which leads to gas separation effect.