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Theoretical Analysis of Cylindrical Microparticle Photophoresis in a Perpendicular Optical Field with Thermal Stress Slip Model

Published online by Cambridge University Press:  22 March 2012

P.-Y. Tzeng ,
C.-H. Liu ,
W.-K. Li  and
C.-Y. Soong
P.-Y. Tzeng
Affiliation:
Department of Mechatronics, Energy and Aerospace Engineering, Chung Cheng Institute of Technology, National Defense University, Taoyuan, Taiwan 33509, R.O.C.
C.-H. Liu
Affiliation:
Department of Biomedical Engineering, Yuanpei University, Hsinchu, Taiwan 30015, R.O.C.
W.-K. Li
Affiliation:
Planning Division, Army Command Headquarters, Ministry of National Defense, Taoyuan, Taiwan 32509, R.O.C.
C.-Y. Soong*
Affiliation:
Department of Aerospace and Systems Engineering, Feng Chia University, Taichung, Taiwan 40724, R.O.C.
*
*Corresponding author ([email protected])
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Abstract

The present study is concerned with a theoretical analysis of the photophoresis of a microsized long cylinder in a perpendicular optical field. Different from previous studies of photophoresis, thermal stress slip usually neglected is taken into account in the analysis. The gaseous fluid relative to the microparticle in photophoretic motion falls into slip-flow regime. Asymmetric distribution of the absorbed heat energy within the particle becomes the driving force for photophoretic motion of the cylinder-shaped particle. By evaluating heat source function distributions at various conditions, the study focuses on the effects of particle size and optical properties on the energy distribution and the resultant influences on the photophoresis. The photophoretic mobility is developed by the slip flow model with consideration of thermal stress slip. The results reveal that the photophoretic mobility decreases with the increase of particle thermal conductivity (k*) and increases with Knudsen number (Kn). The thermal stress slip effect on photophoretic velocity is more noticeable at high Kn, but disappears at the continuum limit. A long cylinder-shaped particle has higher photophoretic velocity than a spherical particle at low k*, while the situation reverses at high k*. With thermal stress slip considered, the critical condition for crossing of the photophoretic velocity curves of cylindrical and spherical particles is mildly influenced by Kn.

Keywords

PhotophoresisCylindrical particleSlip-flow regimeThermal stress slip
Type
Articles
Information
Journal of Mechanics , Volume 28 , Issue 1 , March 2012 , pp. 113 - 121
Copyright
Copyright © The Society of Theoretical and Applied Mechanics, R.O.C. 2012

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