Numerical Analysis of Thermophoresis of a Charged Spheroidal Colloid in Aqueous Media
Thermophoresis of charged colloids in aqueous media has wide applications in biology. Most existing studies of thermophoresis focused on spherical particles, but biological compounds are usually non-spherical. The present paper reports a numerical analysis of the thermophoresis of a charged spheroid...
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doaj-24ace973448546478e4ad14f0849d3802021-02-24T00:02:23ZengMDPI AGMicromachines2072-666X2021-02-011222422410.3390/mi12020224Numerical Analysis of Thermophoresis of a Charged Spheroidal Colloid in Aqueous MediaYi Zhou0Yang Yang1Changxing Zhu2Mingyuan Yang3Yi Hu4Key Laboratory of High Performance Ship Technology, School of Energy and Power Engineering, Wuhan University of Technology, Ministry of Education, Wuhan 430063, ChinaKey Laboratory of High Performance Ship Technology, School of Energy and Power Engineering, Wuhan University of Technology, Ministry of Education, Wuhan 430063, ChinaKey Laboratory of High Performance Ship Technology, School of Energy and Power Engineering, Wuhan University of Technology, Ministry of Education, Wuhan 430063, ChinaKey Laboratory of High Performance Ship Technology, School of Energy and Power Engineering, Wuhan University of Technology, Ministry of Education, Wuhan 430063, ChinaKey Laboratory of High Performance Ship Technology, School of Energy and Power Engineering, Wuhan University of Technology, Ministry of Education, Wuhan 430063, ChinaThermophoresis of charged colloids in aqueous media has wide applications in biology. Most existing studies of thermophoresis focused on spherical particles, but biological compounds are usually non-spherical. The present paper reports a numerical analysis of the thermophoresis of a charged spheroidal colloid in aqueous media. The model accounts for the strongly coupled temperature field, the flow field, the electric potential field, and the ion concentration field. Numerical simulations revealed that prolate spheroids move faster than spherical particles, and oblate spheroids move slower than spherical particles. For the arbitrary electric double layer (EDL) thickness, the thermodiffusion coefficient of prolate (oblate) spheroids increases (decreases) with the increasing particle’s dimension ratio between the major and minor semiaxes. For the extremely thin EDL case, the hydrodynamic effect is significant, and the thermodiffusion coefficient for prolate (oblate) spheroids converges to a fixed value with the increasing particle’s dimension ratio. For the extremely thick EDL case, the particle curvature’s effect also becomes important, and the increasing (decreasing) rate of thermodiffusion coefficient for prolate (oblate) spheroids is reduced slightly.https://www.mdpi.com/2072-666X/12/2/224thermophoresisthermodiffusion coefficientspheroidsrodshydrodynamic effectparticle curvature’s effect |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
Yi Zhou Yang Yang Changxing Zhu Mingyuan Yang Yi Hu |
spellingShingle |
Yi Zhou Yang Yang Changxing Zhu Mingyuan Yang Yi Hu Numerical Analysis of Thermophoresis of a Charged Spheroidal Colloid in Aqueous Media Micromachines thermophoresis thermodiffusion coefficient spheroids rods hydrodynamic effect particle curvature’s effect |
author_facet |
Yi Zhou Yang Yang Changxing Zhu Mingyuan Yang Yi Hu |
author_sort |
Yi Zhou |
title |
Numerical Analysis of Thermophoresis of a Charged Spheroidal Colloid in Aqueous Media |
title_short |
Numerical Analysis of Thermophoresis of a Charged Spheroidal Colloid in Aqueous Media |
title_full |
Numerical Analysis of Thermophoresis of a Charged Spheroidal Colloid in Aqueous Media |
title_fullStr |
Numerical Analysis of Thermophoresis of a Charged Spheroidal Colloid in Aqueous Media |
title_full_unstemmed |
Numerical Analysis of Thermophoresis of a Charged Spheroidal Colloid in Aqueous Media |
title_sort |
numerical analysis of thermophoresis of a charged spheroidal colloid in aqueous media |
publisher |
MDPI AG |
series |
Micromachines |
issn |
2072-666X |
publishDate |
2021-02-01 |
description |
Thermophoresis of charged colloids in aqueous media has wide applications in biology. Most existing studies of thermophoresis focused on spherical particles, but biological compounds are usually non-spherical. The present paper reports a numerical analysis of the thermophoresis of a charged spheroidal colloid in aqueous media. The model accounts for the strongly coupled temperature field, the flow field, the electric potential field, and the ion concentration field. Numerical simulations revealed that prolate spheroids move faster than spherical particles, and oblate spheroids move slower than spherical particles. For the arbitrary electric double layer (EDL) thickness, the thermodiffusion coefficient of prolate (oblate) spheroids increases (decreases) with the increasing particle’s dimension ratio between the major and minor semiaxes. For the extremely thin EDL case, the hydrodynamic effect is significant, and the thermodiffusion coefficient for prolate (oblate) spheroids converges to a fixed value with the increasing particle’s dimension ratio. For the extremely thick EDL case, the particle curvature’s effect also becomes important, and the increasing (decreasing) rate of thermodiffusion coefficient for prolate (oblate) spheroids is reduced slightly. |
topic |
thermophoresis thermodiffusion coefficient spheroids rods hydrodynamic effect particle curvature’s effect |
url |
https://www.mdpi.com/2072-666X/12/2/224 |
work_keys_str_mv |
AT yizhou numericalanalysisofthermophoresisofachargedspheroidalcolloidinaqueousmedia AT yangyang numericalanalysisofthermophoresisofachargedspheroidalcolloidinaqueousmedia AT changxingzhu numericalanalysisofthermophoresisofachargedspheroidalcolloidinaqueousmedia AT mingyuanyang numericalanalysisofthermophoresisofachargedspheroidalcolloidinaqueousmedia AT yihu numericalanalysisofthermophoresisofachargedspheroidalcolloidinaqueousmedia |
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