Thermophoretic force on nonspherical particles in the free-molecule regime

Song Yu, Jun Wang, Guodong Xia, and Luxiang Zong
Phys. Rev. E 97, 053106 – Published 17 May 2018

Abstract

The present paper is devoted to studying the thermophoresis of a nonspherical convex particle suspended in a gas with nonuniform temperature distribution in the free-molecule regime. Based on the gas kinetic theory and the assumption of a rigid-body collision for the gas-particle interaction, analytical expressions for the thermophoretic forces are obtained for several typical nonspherical bodies, including cylinders, spheroids, needles, disks, and cuboids. The orientation dependences of the thermophoretic forces and thermophoretic velocities are evaluated based on these expressions. It is found that the influence of the pitching effect of the nonspheres can be significant. The expressions for the orientation-averaged thermophoretic forces are also obtained under the assumption of a uniform particle orientation distribution.

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  • Received 9 February 2018
  • Revised 5 April 2018

DOI:https://doi.org/10.1103/PhysRevE.97.053106

©2018 American Physical Society

Physics Subject Headings (PhySH)

Statistical Physics & ThermodynamicsFluid Dynamics

Authors & Affiliations

Song Yu, Jun Wang*, Guodong Xia, and Luxiang Zong

  • Key Laboratory of Enhanced Heat Transfer and Energy Conservation, Ministry of Education, and Key Laboratory of Heat Transfer and Energy Conversion, Beijing Municipality, College of Environmental and Energy Engineering, Beijing University of Technology, Beijing 100124, People's Republic of China

  • *jwang@bjut.edu.cn

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Vol. 97, Iss. 5 — May 2018

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