Shear lift forces on convex non-spherical particles in the free molecular regime

被引：0

作者：

Chang, Xinquan ^{[1
]}

Yu, Song ^{[1
,2
]}

Zhang, Kexue ^{[1
]}

Zhuo, Shaobin ^{[3
]}

Wang, Jun ^{[1
]}

Xia, Guodong ^{[1
]}

Li, Zhigang ^{[3
]}

机构：

[1] Beijing Univ Technol, Coll Mech & Energy Engn, Beijing Key Lab Heat Transfer & Energy Convers, Beijing 100124, Peoples R China

[2] China Inst Atom Energy, Lab Reactor Thermal Hydraul, Beijing 102413, Peoples R China

[3] Hong Kong Univ Sci & Technol, Dept Mech & Aerosp Engn, Kowloon, Clear Water Bay, Hong Kong 000000, Peoples R China

来源：

JOURNAL OF AEROSOL SCIENCE | 2025年 / 185卷

基金：

中国国家自然科学基金;

关键词：

Non-spherical particles; Free molecular regime; Shear lift forces; Particle orientation distribution; Direct simulation Monte Carlo; FLOW; DEPOSITION; MORPHOLOGY; MOBILITY; MODEL;

D O I：

10.1016/j.jaerosci.2025.106546

中图分类号：

TQ [化学工业];

学科分类号：

0817 ;

摘要：

For the theoretical description of the lift forces on particle suspended in a gas, a real particle is usually simplified as a sphere. However, most real particles are non-spherical particles. The influence of the geometric shape and orientation on the transport of the suspended particle is unambiguously non-negligible. In the present paper, the shear lift forces exerted on non-spherical particles are studied in the free molecular regime. Based on the gas kinetic theory, the expressions for effective forces are obtained by integrating the forces on the surface element over the whole particle surface. It is theoretically found that the effective forces are proportional to the surface area of the particle, and the proportion coefficient is independent of the particle size or shape, providing that the particle orientation distribution is uniform. These findings in the present paper has been verified by direct simulation Monte Carlo and can simplify the calculation of the shear lift forces on non-spherical particles in the free molecular regime with a wider range of practical applications.

引用

页数：14

共 42 条

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