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Measurement of negative thermophoretic force

Published online by Cambridge University Press:  19 September 2016

Ryan W. Bosworth ,
A. L. Ventura ,
A. D. Ketsdever  and
S. F. Gimelshein
Ryan W. Bosworth
Affiliation:
Department of Mechanical and Aerospace Engineering, University of Colorado – Colorado Springs, Colorado Springs, CO 80918, USA
A. L. Ventura
Affiliation:
Department of Mechanical and Aerospace Engineering, University of Colorado – Colorado Springs, Colorado Springs, CO 80918, USA
A. D. Ketsdever*
Affiliation:
Department of Mechanical and Aerospace Engineering, University of Colorado – Colorado Springs, Colorado Springs, CO 80918, USA
S. F. Gimelshein
Affiliation:
Gimel Inc., 2417 Carol Park Place, Montrose, CA 91020, USA
*
†Email address for correspondence: [email protected]
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Abstract

The rarefied gas flow phenomenon of thermophoresis is studied experimentally on a macroscopic spherical particle with a diameter of 5.1 cm for pressures ranging from 0.01 to 10 Pa (Knudsen numbers $Kn$ from 10 to 0.01, respectively). Size scaling with matching Knudsen numbers makes the results applicable to microscale particles such as aerosol droplets at atmospheric pressure. Two sets of measurements are presented. The first set, complemented by numerical modelling based on the solution of the ellipsoidal statistical Bhatnagar–Gross–Krook kinetic equation, is focused on a spherical particle of high thermal conductivity in close proximity to a heated wall. The second set is conducted for the same particle placed in a linear thermal gradient established between two parallel walls. Results show the first reproducible measurements of negative thermophoretic force acting on a spherical particle in the direction from cold to hot, with values of the order of 5 % of the maximum hot to cold force production.

JFM classification

Rarefied Gas Flow: Kinetic theory Rarefied Gas Flow: Molecular dynamics Rarefied Gas Flow: Rarefied Gas Flow
Type
Papers
Information
Journal of Fluid Mechanics , Volume 805 , 25 October 2016 , pp. 207 - 221
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Copyright
© 2016 Cambridge University Press 

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