气溶胶粒子在微通道中的扩散泳效应数值模拟分析

Numerical Simulation Analysis of Diffusion Swimming Effect of Aerosol Particles in Microchannels

针对快堆内高比活度气态裂变产物吸附、捕集情况,为分析由此产生的气溶胶粒子扩散、泄漏影响,建立空气-水蒸气两组分混合气体二维水平微通道冷凝相变模型。考虑到冷凝现象引起的水蒸气浓度变化,粒子受到由此引起的附加质量力,也就是扩散泳力的作用,针对扩散泳作用,构建亚微米粒子受扩散泳作用影响的沉降模型以及数值模拟方法。通过Fluent中的UDF功能模块实现粒子受扩散泳力作用下的模拟计算,最终得到可以模拟冷凝状态下气溶胶粒子沉降的计算模型。

In order to analyze the effects of aerosol particle diffusion and leakage on the adsorption and capture of high specific activity gaseous fission products in fast reactors,a two-dimensional horizontal microchannel condensation phase transition model of air water vapor mixture gas was established.Considering the concentration change of water vapor caused by condensation,the particles were subjected to the additional mass force,which is the effect of diffusion swimming force,Construct a settling model and numerical simulation method for submicron particles under the influence of diffusion swimming force,and use the UDF functional module in Fluent to simulate the settling of aerosol particles under diffusion swimming force.Finally,obtain a computational model that can simulate the settling of aerosol particles under condensation state.