应用随机轨道模型研究湍流扩散对气液交叉流脱除PM2.5的影响  

Research of Diffusion of Gas-liquid Cross Flow for PM 2.5 Separation by Stochastic Trajectory Model

作　　者：余徽[1] 陈思含[1] 魏文韫[1] 刘凌岭 左炀[1] 

机构地区：[1]四川大学化学工程学院,四川成都610065

出　　处：《四川大学学报（工程科学版）》2015年第5期178-184,共7页Journal of Sichuan University (Engineering Science Edition)

基　　金：国家国际科技合作专项资助项目(2014DFG92250)

摘　　要：针对气液交叉流脱除气相中PM 2.5过程的颗粒湍流扩散和热泳作用机理的协同作用进行了实验研究和数值模拟。引入颗粒随机轨道模型考察热泳作用下PM 2.5颗粒的运动情况,模拟结果与化学分析法和重量法的颗粒脱除实验结果进行对比。结果表明采用重量法测得的颗粒脱除率与化学分析法基本相同,验证了2种颗粒浓度检测方法的一致性;当气相流速为1 m/s时,添加颗粒湍流扩散模型相比于未考虑时,模拟数据与实验结果的相对偏差从-60%缩小至±30%,表明湍流扩散是本系统中颗粒脱除的重要影响因素。The turbulent diffusion and thermophoresis of particle in the process of gas-liquid cross flow used to absorb PM 2.5 were in- vestigated by experiment and simulation. The stochastic trajectory mode] was proposed to investigate the motion situation under thermo- phoresis of particle and the simulation results were compared with two detection methods of chemical analysis and gravimetric analysis. The results showed that the trap rate of particle by chemical analysis was basically the same as it by gravimetric analysis, and the consis- tency of two detections of particle concentration was verified. When the gas velocity rate was 1 m s-1 and the turbulent diffusion model was also considered into numerical computation, the relative deviation between numerical simulation and experiment was reduced from - 60% to ＋ 30%. which proved that the turbulent diffusion was one of the most important factors affecting the particle removal in the system.

关 键 词：气液交叉流 颗粒浓度检测 湍流扩散 随机轨道模型 

分 类 号：X51[环境科学与工程—环境工程]