Title: Numerical study on thermophoresis of dust in air

Authors: Tu Thien Ngo; Dong-Wook Oh

Addresses: Department of Mechanical Engineering, Chosun University, 309, Pilmundaero, Donggu, Gwangju 61452, South Korea; Faculty of Mechanical Engineering, Ho Chi Minh University of Technology (HCMUT), 268 Ly Thuong Kiet Street, District 10, Ho Chi Minh City, Vietnam; Vietnam National University Ho Chi Minh City, Linh Trung Ward, Thu Duc District, Ho Chi Minh City, Vietnam ' Department of Mechanical Engineering, Chosun University, 309, Pilmundaero, Donggu, Gwangju 61452, South Korea

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.

Keywords: thermophoresis; dust in air; dust concentration; particle migration; natural convection; CFD; computational fluid dynamics; species model.

DOI: 10.1504/IJNT.2022.122370

International Journal of Nanotechnology, 2022 Vol.19 No.1, pp.75 - 87

Received: 08 May 2021
Accepted: 12 May 2021

Published online: 16 Apr 2022 *

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