Iranian Journal of Physics Research

Hydrodynamic interaction between two beads in the presence of a temperature gradient: Effect of correlation of beads’ motion on the Soret effect

Document Type : Original Article

Authors

Golnaz Najafi Golvandani 1
ّFereshteh Salari 1
Seyed Nader Rasuli 2

1 Department of Physics, College of Science, University of Guilan

2 School of Physics, Institute for Research in Fundamental Sciences (IPM), Tehran

https://doi.org/10.47176/ijpr.23.4.91752
Abstract
To study the effect of internal structure of molecules on the Soret effect, we probe consequences of exerting a temperature gradient to a suspension of one single particle inside the fluid. The particle is modeled as two microspheres, loosely connected with a spring between them, or each trapped with an optical tweezers. For the later case, we calculate the net force, that the two beads system exerts on its surrounding fluid, due to the a temperature gradient. This result, lets us calculate the corresponding Soret coefficient of the two beads system. We further correct these calculations, considering the temperature dependence of the surrounding fluid’s viscosity.

Keywords

temperature gradient
Soret effect
colloidal solution
temperature dependence of the viscosity
hydrodynamic interactions
Langevin equation
Subjects
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