Numerical study on thermophoresis of dust in air Online publication date: Thu, 21-Apr-2022
by Tu Thien Ngo; Dong-Wook Oh
International Journal of Nanotechnology (IJNT), Vol. 19, No. 1, 2022
Abstract: Aerosol particles tend to move from high-to low-temperature areas through the thermophoresis effect. The thermophoresis effect can cause accumulation and an increased concentration of dust on a low-temperature surface. In this study, the thermophoresis of dust in the vicinity of hot and cold microheaters is analysed through a numerical simulation. Operating parameters such as temperature difference between hot and cold microheaters, the thermal diffusion coefficient of dust, the diameter of a dust particle, the distance between two microheaters, and initial dust concentration are analysed. Calculation results show that the temperature difference between two microheaters, thermal diffusion coefficient, particle diameter, and initial dust concentration have a linear relationship with the concentration of accumulated dust in the vicinity of the cold microheater. Through this study, further understanding of thermophoresis of dust in air mixture can be obtained and used to accurately measure the dust concentration depending on the size of the dust particles.
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