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Numerical simulations of nano-particle’s drag forces using DSMC method for various Knudsen numbers

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Abstract

In this study, high-vacuum flow was analyzed using the direct simulation Monte Carlo (DSMC) method, and various forces acting on fine particles in a high-vacuum flow field were studied. The DSMC method is a Lagrangian method that models the flow as particles and analyzes the collisions and behaviors of each particle, which costs a large computing resource. To validate DSMC method, computational results of a Poiseuille flow in microchannel are compared with analytical results. In addition, the force acting on the particles in the high-vacuum rarefied gas region was verified using the outputs of previous studies. Through this numerical analysis, it is possible to analyze about regions that are difficult to proceed with experiments. As a result, the drag forces according to the Knudsen number which indicates the ratio of vacuum and the particle size, it was confirmed that the drag force can be predicted through the empirical formula of previous studies.

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Authors and Affiliations

  1. Department of Mechanical Engineering, Hanyang University, 222 Wangsimni-ro, Seongdong-gu, Seoul, 04763, Korea

    Sang Woo Shin & Sang Hwan Lee

Authors
  1. Sang Woo Shin
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  2. Sang Hwan Lee
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Correspondence to Sang Hwan Lee.

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Sang-Hwan Lee received his Ph.D. from State University of New York at Buffalo in 1986. Now he is a Professor of Mechanical Engineering Department at Hanyang university. Recently his research interest is particle simulation, computational fluid dynamics and desalination simulation which are based on GPU computing and parallel computing.

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Shin, S.W., Lee, S.H. Numerical simulations of nano-particle’s drag forces using DSMC method for various Knudsen numbers. J Mech Sci Technol 36, 4649–4657 (2022). https://doi.org/10.1007/s12206-022-0826-y

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  • DOI: https://doi.org/10.1007/s12206-022-0826-y

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