Experimental and mechanistic study of dispersed micrometer-sized particle resuspension in a square straight duct with rough walls  

作　　者：Qi Sun Suyuan Yu Wei Peng 

机构地区：[1]Institute of Nuclear and New Energy Technology,Cooperation Innovation Center of Advanced Nuclear Energy Technology,Key Laboratory of Advanced Reactor Engineering and Safety of Ministry of Education,Tsinghua University,Beijing,100084,China [2]Center for Combustion Energy,Key Laboratory for Thermal Science and Power Engineering of the Ministry of Education,Department of Energy and Power Engineering,Tsinghua University,Beijing,100084,China

出　　处：《Particuology》2023年第12期101-114,共14页颗粒学报（英文版）

基　　金：This project was supported by the Beijing Natural Science Foundation(No.JQ21009);the National Natural Science Foundation of China(NSFC)(No.52176158);the National Key R&D Program of China(No.2020YFB1901401);the Youth Talent Project of China National Nuclear Corporation.

摘　　要：The resuspension of graphite dust is an important phenomenon in the release of radioactivity and the safety of nuclear reactors during severe accidents.In this study,a visualization experimental platform is constructed to study effects of particle size,flow velocity,and wall roughness on the resuspension characteristics of graphite particles.A statistical model of particle resuspension applicable to monolayer dispersed particles is developed based on the moment equilibrium of the particles and the flow field characteristics,as calculated by the large-eddy simulation framework.The results show that particle resuspension can be divided into short-and long-term resuspension stages.Most particle resuspension occurs during the short-term stage.With increases in flow velocity and particle diameter,the aerodynamic or adhesion force acting on the particles increases,and corresponding particle resuspension fraction increases.The influence of rough walls on particle resuspension is related to both the force on the particles and the arm ratio between the wall morphology and the particle diameter.A comparison with the experimental results demonstrates that the particle resuspension model developed in this study accurately predicts the impact of flow velocity,particle size,and wall roughness on particle resuspension.

关 键 词：Particle resuspension Statistical model Moment equilibrium High temperature gas-cooled reactor(HTGR) 

分 类 号：TH11[机械工程—机械设计及理论]