化工进展2025，Vol.44Issue(7)：3718-3726,9.DOI:10.16085/j.issn.1000-6613.2024-0780
微米级湿颗粒的动态碰撞行为及能量耗散机制
Dynamic collision behavior and energy dissipation mechanism of micron wet particles
摘要
Abstract
Microscopic particles are not only the main cause of haze but also can carry toxic substances that can be adsorbed into the human lungs,posing a threat to human health.Heterogeneous condensation technology,considered as one of the most promising dust removal technologies,effectively enhances the efficiency of gas-solid separation by forming a liquid film on the particle surface.However,the collision and coalescence mechanisms of micrometer-level wet particles are not yet fully understood.Therefore,this study focused on micrometer-level condensable wet particles and established a model that integrates two-phase flow,continuous surface tension,and overlapping grids to investigate the dynamic changes of particles and liquid bridges during the collision process.By analyzing the effects of surface tension coefficient,liquid film thickness,and relative velocity before collision on particle collision behavior,the study summarized the laws of particle dynamics during collision and the energy dissipation situation,providing a theoretical basis for improving the aggregation effect of wet particles and enhancing dust removal performance.The results indicated that in normal collisions,wet particles followed a motion pattern of liquid film deformation,rebound,coalescence,or separation.Moreover,reducing the surface tension coefficient and liquid film thickness while increasing collision velocity led to an increase in the height of the liquid bridge.As for energy dissipation,pressure resistance and energy loss caused by surface tension were the dominant factors,while energy loss due to viscous resistance can be neglected.关键词
微尺度/可凝结颗粒物/碰撞/数值模拟/能量耗散Key words
microscale/condensable particles/collision/numerical simulation/energy dissipation分类
化学化工引用本文复制引用
张若琛,王家瑞,王斯民,张早校..微米级湿颗粒的动态碰撞行为及能量耗散机制[J].化工进展,2025,44(7):3718-3726,9.基金项目
国家自然科学基金(22308273). （22308273）
