化工学报2025，Vol.76Issue(8)：3944-3953,10.DOI:10.11949/0438-1157.20250166
自由分子区内不规则颗粒的热泳力计算
Thermophoretic forces on irregular particles in the free molecular regime
常心泉 1张克学 1王军 1夏国栋1
作者信息
- 1. 北京工业大学,传热强化与过程节能教育部重点实验室,传热与能源利用北京重点实验室,北京 100124
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摘要
Abstract
In a gas-solid two-phase flow,the particles suspended in the gas are mostly non-spherical,whose geometric shape and orientation have a significant impact on particle transport.Non-spherical particles are usually simplified as sphere particles,but this may cause serious errors.While the specific expressions for non-spherical particles are too complex to be employed for practical applications.In this paper,we derived a general expression for the thermophoretic force of non-spherical particles in the free molecular regime.Then specific expressions for the thermophoretic force on sphere and cylinder can be obtained.Considering the high-speed Brownian rotation of particles in the free molecular region,a uniformly random distribution of the particle orientation can be assumed in the case of weak potential field.Based on this,the expression of the orientation-averaged thermophoretic force on particles of any shape can be derived,which is found to be proportional to the surface area of the particles,and the proportion coefficient is independent of the particle size or shape.This result is verified by direct simulation Monte Carlo,providing a new idea for simplifying the research on particle transport characteristics and its application.关键词
气溶胶/多相流/非球形颗粒/热泳力/动力学理论/直接Monte Carlo模拟Key words
aerosol/multiphase flow/non-spherical particle/thermophoretic force/kinetic theory/direct simulation Monte Carlo分类
数理科学引用本文复制引用
常心泉,张克学,王军,夏国栋..自由分子区内不规则颗粒的热泳力计算[J].化工学报,2025,76(8):3944-3953,10.
