PHYSICS OF GASES, PLASMAS, AND ELECTRIC DISCHARGES |
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Effect of the particle temperature on lift force of nanoparticle in a shear rarefied flow |
Jun-Jie Su(苏俊杰), Jun Wang(王军)†, and Guo-Dong Xia(夏国栋) |
MOE Key Laboratory of Enhanced Heat Transfer and Energy Conservation, Beijing Key Laboratory of Heat Transfer and Energy Conversion, Beijing University of Technology, Beijing 100124, China |
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Abstract The nanoparticles suspended in a shear flow are subjected to a shear lift force, which is of great importance for the nanoparticle transport. In previous theoretical analysis on the shear lift, it is usually assumed that the particle temperature is equal to the temperature of the surrounding gas media. However, in some particular applications, the particle temperature can significantly differ from the gas temperature. In the present study, the effect of particle temperature on the shear lift of nanoparticles is investigated and the corresponding formulas of shear lift force are derived based on the gas kinetic theory. For extremely small nanoparticles (with radius R<2 nm) or large nanoparticles (R>20 nm), the influence of the particle temperature can be neglected. For the intermediate particle size, the relative error induced by the equal gas-particle temperature can be significant. Our findings can bring an insight into accurate evaluation of the nanoparticle transport properties.
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Received: 23 February 2021
Revised: 22 March 2021
Accepted manuscript online: 30 March 2021
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PACS:
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51.10.+y
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(Kinetic and transport theory of gases)
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34.20.-b
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(Interatomic and intermolecular potentials and forces, potential energy surfaces for collisions)
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47.45.Dt
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(Free molecular flows)
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Fund: Project supported by the National Natural Science Foundation of China (Grant No. 51776007), Beijing Nova Program of Science and Technology (Grant No. Z191100001119033), and the Youth Talent Support Program of Beijing Municipal Education Committee (Grant No. CIT&TCD201904015). |
Corresponding Authors:
Jun Wang
E-mail: jwang@bjut.edu.cn
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Cite this article:
Jun-Jie Su(苏俊杰), Jun Wang(王军), and Guo-Dong Xia(夏国栋) Effect of the particle temperature on lift force of nanoparticle in a shear rarefied flow 2021 Chin. Phys. B 30 075101
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