The study of the effects of triangular roughness on the thermal creep flow in Knudsen pumps with DSMC method

Authors

1 Department of Mechanical Engineering, Engineering Faculty. Razi University, Iran

2 Department of Mechanical Engineering, Engineering Faculty. Razi University, Iran.

Abstract

In this study, the effects of wall roughness on the flow parameters in Knudsen pumps are investigated using the particle-based direct simulation Monte Carlo method. For this purpose, the thermal creep flow in a microchannel with a linear temperature gradient on the walls is solved in a wide range of Knudsen numbers (0.1 ≤ Kn ≤ 10). The roughness is modeled as triangular elements on the walls. A comprehensive study is done on the geometrical parameters of the roughness, including height (0 ≤ε≤10), aspect ratio (1 ≤ξ≤3), and the distance of the elements (1 ≤χ≤5). Evaluation of the results indicates that the mass flow rate of the thermal creep flow in rough channels, no matter how small the roughness, has a significant reduction compared to the smooth channel. For example, a reduction of 26% is observed for a tinny roughness of ε=1.25%. It is also observed that the aspect ratio and the distance of the rough elements do not have a significant effect on the flow parameters in the studied range.

Keywords

References

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Journal of Solid and Fluid Mechanics
Volume 10, Issue 4
December 2021
Pages 97-109

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