湿度场内脱除亚微米颗粒数值模拟与实验验证  

Simulation and experimental verification of submicron-particle capture efficiency under humidity gradient

作　　者：杨晨鹏 陈倬 朱家骅[1] 杨海涛 段旬 YANG Chen-peng;CHEN Zhuo;ZHU Jia-hua;YANG Hai-tao;DUAN Xun(School of Chemical Engineering,Sichuan University,Chengdu 610065,China)

机构地区：[1]四川大学化学工程学院

出　　处：《高校化学工程学报》2019年第6期1329-1336,共8页Journal of Chemical Engineering of Chinese Universities

基　　金：国家自然科学基金(21276161)

摘　　要：针对含尘气体横掠直立波形通道降膜除尘过程,建立了空气-水蒸气两组分水平二维流场中湿度梯度推动下亚微米颗粒扩散泳机理模型和数值模拟方法,与实验相对照研究了40℃下气流雷诺数Re(895~1 714)、初始相对湿度φ(0.32~0.97)及颗粒粒径dp(0.1~1μm)内亚微米颗粒捕集率,结果表明:气流湿度影响显著,φ由0.32增大到0.97时,各粒级颗粒捕集率均有相同程度的提高(~16.5%),低Re时增幅更大,可达21.7%。模拟计算值与实验测试结果偏差在±15%以内,吻合较好。A mechanism model of submicron aerosol particle diffusiophoresis under humidity gradient in a 2-dimension horizontal flow field of binary gas mixture was developed, which was used for dust removal from dust-containing gas crossing channels formed by vertical waved plates with falling film. Simulations were carried out under Reynolds number Re = 895~1 714, initial gas relative humidity φ= 0.32~0.97 and particle size dp = 0.1~1 μm. The results show that the change of φ has a significant impact on the submicron particle capture efficiency. When φ increased from 0.32 to 0.97, the graded capture efficiencies increased evenly by 16.5%. The increase rate was larger under lower Re(up to 21.7%). The simulated results are in good agreement with the experimental ones within discrepancy of ±15%.

关 键 词：亚微米颗粒 扩散泳 模型 数值模拟 

分 类 号：X51[环境科学与工程—环境工程]