Effects of thermophoresis on Brownian coagulation of spherical particles over the entire particle size regime

作     者：Kaiyuan Wang Pei Wang Suyuan Yu Kaiyuan Wang;Pei Wang;Suyuan Yu

作者机构：Institute of Applied Physics and Computational MathematicsBejing 100094.China Center forCombustionEergy.Key Laboratory for Thermal Science and Power Engineering of Ministry of EducationDepartment of Energyand PowerEngineeringTsinghua UniversityBejing 100084.China Smoore International Holdings Ltd.Shenzhen 518102China 

出 版 物：《Particuology》 (颗粒学报（英文版）)

年 卷 期：2022年第20卷第8期

页      面：8-17页

核心收录：

学科分类：07[理学] 0701[理学-数学] 070101[理学-基础数学] 

基　　金：supported by the Science Challenge Project(grant No.TZ2016001) the Strategic Priority Research Program ofthe Chinese Academy of Sciences(grant No.XDB22040402) the National Natural Science Foundation of China(grant Nos.11525211 and U1530261) 

主　　题：Thermophoresis Brownian coagulation Enhancement factor Knudsen number 

摘      要：In many energy and combustion *** experience large temperature gradients,which can affect the coagulation process due to *** study presents a rigorous theory of thermophoretically modified Brownian coagulation in the entire particle size *** theoretical derivations are based on the kinetictheory forthe free-molecular regime and the harmonic mean method for the transition *** coagulation kernels in different size regimes can be expressed as the basic Brownian coagulation kernel times an enhancement factor,The enhancement factor represents the coagulationrate enhancement induced by thermophoresis and is a function of specific dimensionless *** on the enhancement factor,the thermophoretic enhancement effects on particle coagulation are further analyzed under a wide range of gas and particle *** results show that thermophoretic enhancement effects are ignorable in the free-molecular regime,but need to be considered in the continuum regime and the transition *** addition,the enhancement effects increase significantly with increase of gas temperature and temperature gradient while decrease with increase of gas *** present study can improve understanding ofthermophoretic effects on Brownian coagulation in the entire size regime and provide a useful tool to calculate the coagulation rates in presence of thermophoresis.