气液交叉流阵列PM2.5热泳和扩散泳拟传质模型

基于气溶胶中PM2.5微细颗粒物拟流体特性,对气液交叉流阵列中PM2.5在气溶胶流体传热传质边界层内热泳和扩散泳运动进行拟传质机理分析,与跟随气体的对流传质相叠加,建立了气液交叉流阵列PM2.5热泳和扩散泳拟传质模型,并进行了实验检验。实验在固定对流条件下,考察了不同气液相温度差导致的热泳、不同气相湿度差导致的扩散泳和颗粒粒径等因素对气液交叉流阵列PM2.5拟传质系数的影响。实验数据统计值与模型表达趋势一致,在初始温差40℃、初始湿度0.118 kg/kg条件下,100排气液交叉流阵列PM2.5拟传质系数模型预测值为3.33×10^-3 m/s、实验值为3.75×10^-3 m/s。

Pseudo mass transfer model of PM2.5 thermophoresis and diffusiophoresis in gas-liquid cross flow array

Based on the pseudo-fluid characteristics of PM2.5 in aerosol, the pseudo mass transfer mechanism of PM2.5 in gas-liquid heat and mass transfer boundary layer was analyzed, considering the convective mass transfer of PM2.5 caused by thermophoresis, diffusiophoresis and the gas movement, a pseudo mass transfer model of PM2.5 in gas-liquid cross flow array based on thermophoresis and diffusiophoresis is established, and the accuracy of the model is verified through experiments. The influencing of thermophoresis caused by gas-liquid temperature difference, diffusiophoresis caused by gas-liquid humidity difference and particle size on the pseudo mass transfer coefficient of PM2.5 was investigated under fixed convection conditions. The experimental data statistics are consistent with the model expression trend. Under the initial temperature difference of 40℃ and initial humidity of 0.118 kg/kg, the predicted value of the PM2.5 pseudo-mass transfer coefficient model of the exhaust gas cross-flow array is 3.33×10^-3 m/s, experimental value 3.75×10^-3 m/s.