蒸汽相变作用下不可溶PM10增长性能的数值模拟

目前，对颗粒凝结增长性能的数值模拟均忽略了其碰撞效应。为了对其进行补充，在相关研究的基础上，将颗粒群平衡模型（population balance module,PBM）与欧拉多相流模型进行耦合，通过用户自定义函数（user-defined function,UDF）同时引入碰撞团聚核函数和凝结增长速率函数，采用数值模拟，分析了初始蒸汽饱和度、停留时间、初始颗粒数浓度和初始粒径对不可溶PM10凝结增长性能的影响。模拟结果表明，初始蒸汽饱和度越大，颗粒凝结增长后的最终粒径越大；在一定范围内，延长停留时间，能够促进颗粒的凝结增长；初始颗粒数浓度的增大不利于颗粒的凝结增长；初始粒径越小，颗粒凝结增长性能越好，相变凝结的效果越明显。上述模拟结果与实验结果一致。

Numerical simulation of growth performance of insoluble PM10 by vapor heterogeneous condensation

Current numerical simulation of the condensation growth of particles ignores the effects of collision. In order to supplement it，using numerical simulation，analyze the influences of initial vapor saturation，residence time，initial particle number concentration and initial particle size on the condensation growth by coupling population balance model (PBM) and Eulerian multiphase model，via introduction of the aggregation kernel function and the condensation growth rate function by the user-defined functions (UDF) on the basis of relevant research. Results show that the greater the initial vapor saturation is，the greater the final particle size is after the condensation growth.The residence time extension can promote the condensation growth of the particles in a certain range.The increase of the initial particle number concentration is adverse to the condensation growth of the particles.The smaller the initial particle size is，the better the particle condensation growth performance is and the more obvious the effect of heterogeneous condensation is. The simulated results are consistent with the experimental results.