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In this work the fluctuating-lattice Boltzmann method was adopted to numerically investigate the Brownian motion of particles in a fluid with inhomogeneous temperature field. It has been found that the Brownian particles are preferential to randomly move into a cold fluid area. Once the particles go into the cold area, the boundary between the hot fluid and cold fluid acts like a temperature barrier, preventing the particles from going out. Most important of all, the Brownian particles can be captured or collected by the cold fluid area if the temperature of cold fluid is lower than a critical value. In addition, the dependence of this critical value on the fluid viscosity is studied.
PAPER REVISED: 2018-11-30
PAPER ACCEPTED: 2019-03-15
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THERMAL SCIENCE YEAR 2020, VOLUME 24, ISSUE Issue 6, PAGES [3707 - 3719]
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