摘要
空气过滤器广泛应用于半导体生产、制药工业和工业空气处理等行业,但是目前缺少空气过滤器抗水雾性能测试标准。本文采用数值模拟方法,以空气过滤器抗水雾性能测试实验台管道为对象,研究管道内雾化水液滴的运动过程以及达到空气过滤器入口处的液滴质量浓度与粒径的变化规律。模拟液滴在喷嘴处释放并随饱和湿空气运动,直至液滴离开管道或被壁面捕集全过程,并研究液滴的随机碰撞、破碎以及聚并。根据数值模拟结果,统计进入过滤器和被管道各个壁面捕集的液滴质量分数,考察风量、过滤器迎风面与管道入口距离、初始入口液滴质量浓度等参数对过滤器入口处液滴质量浓度与粒径的影响。研究结果表明:液滴在管道运动过程中,液滴质量浓度随运动距离增加而减少,液滴平均粒径随运动距离增加而增加;过滤器迎风面以及管道底面捕集的液滴质量分数相对较高;过滤器迎风面捕集的液滴质量分数随风量增加而提高,随过滤器迎风面与管道入口距离增加而降低,管道底面捕集的液滴质量随风量及入口距离的变化规律与之相反;过滤器入口处的液滴质量浓度以及平均粒径随初始入口液滴质量浓度以及过滤器迎风面与管道入口距离增加而升高。
Air filter elements were widely applied in semiconductor production,pharmaceutical and air treatment industries,however,there was currently a lack of air filter water endurance test standard.The flow with droplets in a test rig for water endurance of air filter elements was simulated.The motion of atomized water droplets in the pipeline and the change of droplet mass concentration and diameter were studied.The droplets were released at the nozzles and moved with the saturated humid air until they left pipeline or were captured by the wall.The random collision,fragmentation and coalescence of the droplets were considered during the simulation.The mass fraction of droplets entering filter or captured by each wall of the pipeline were counted based on the simulation results.The influence of air flow rate,distance between windward surface of filter and inlet of the pipeline and initial droplet mass concentration on the mass concentration and diameter of droplets at the entrance of the filter were investigated.The results show that during the movement of droplets in the pipeline,the mass concentration of droplets decreases with the increase of movement distance,and the mean diameter increases with the increase of movement distance.The windward surface of filter and the bottom surface of pipeline capture a relatively high mass fraction of droplets.Contrary to the bottom surface of the pipeline,the mass fraction of droplets captured by the windward surface of the filter increases with the increase of air flow rate,and decreases with the increase of distance between windward surface of filter and inlet of the pipeline.The droplet mass concentration and mean diameter at the inlet of filter increase with the increase of initial inlet droplet mass concentration and the distance between the windward surface of the filter and inlet of pipeline.
作者
张涛
刘道银
刘志坦
金默
周浩
付忠广
ZHANG Tao;LIU Daoyin;LIU Zhitan;JIN Mo;ZHOU Hao;FU Zhongguang(School of Energy,Power and Mechanical Engineering,North China Electric Power University,Beijing 102206,China;Guodian Science and Technology Co.Ltd.,Nanjing 210033,China;Key Laboratory of Energy Thermal Conversion and Control of Ministry of Education,Southeast University,Nanjing 210096,China)
出处
《中南大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
2021年第6期2002-2010,共9页
Journal of Central South University:Science and Technology
基金
北京自然科学基金资助项目(3162030)。
关键词
空气过滤器
抗水雾性能
数值模拟
液滴质量浓度
平均粒径
air filter
water endurance
numerical simulation
droplets mass concentration
mean diameter
