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Influence of horizontal and downward airflow on initial aerosol movement


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Influence of horizontal and downward airflow on initial aerosol movement
Wang Jiawei1Li Lei12Lu Xiaoxia1Zhao Shoutian1Chai Mingming1
1.State Key Laboratory of NBC Protection for Civilian,Beijing 102205,China;
2.Aerospace School,Tsinghua University,Beijing 100084,China
gas-liquid two-phase flow discrete phase model aerosol droplets horizontal and downward airflow
Considering the droplets collision-breakup model and the effects of horizontal and downward airflow,the flow of aerosol released from the air to the open environment is investigated numerically by applying the discrete phase model of the gas-liquid two-phase flow.The motion characteristics of aerosol droplets in open environment are obtained and verified by experiments.The numerical and experimental results show that when the velocities of the horizontal and downward airflow are both small(less than 1 m/s),the ejecting angle is larger than 30°,the initial size of the particles is 100 μm,and the ejecting speed is about 80 m/s,the generated aerosol particles sedimentate to the ground in a short time.When the velocity of the horizontal airflow reaches 3 m/s,aerosol particles released under the same conditions show more difficulty to fall to the ground.In the two above cases,increasing the ejecting angle or the downward airflow velocity can make the aerosol particles sedimentate to the ground more easily.


[1] Nuyttens D,De Schampheleire M,Baetens K,et al.The influence of operator-controlled variables on spray drift from field crop sprayers[J].American Society of Agricultural and Biological Engineers,2007,50(4):1129-1140.
[2]Lorraine Maltby,Louise Hills.Spray drift of pesticides and stream macroinvertebrates:Experimental evidence of impact and effectiveness of mitigation measures[J].Environmental Pollution,2008(156):1112-1120.
Wang Liwei,Cai Donglin,Wu Jianhao,et al.Experimental study of small unmanned helicopter spray deposition[J].Journal of Agricultural Mechanization Research,2013(5):183-185.
Ren Xiaobing,Li Lei,Li Yongchi.Numerical simulation of explosive dispersal of liquids in far-field period[J].Journal of Northeastern University(Natural Science),2006,27(1):190-193.
Wu Lei,Qian Zhibo,Zhu Yunjin.Numerical simulation of spray characteristic in a swirl nozzle[J].Fire Control and Command Control,2010,35(7):147-150.
Chen Fayuan,Wang Xiaochan,Ding Weimin,et al.Numerical simulation and experimental verification of 3-D air-velocity field of disk fan used in orchard sprayer[J].Transactions of the Chinese Society for Agricultural Machinery,2010,41(8):51-55.

Zhang Zheng,Xie Zhuoli.Numerical simulation of fluid-solid two-phase flows[J].Journal of Chemical Industry and Engineering,2001,52(1):1-12.

Zhou Junhu,He Pei,Wang Zhihua,et al.Numerical simulation of spray in crossflow of liquid jet into air stream[J].Journal of Zhejiang University(Engineering Science),2008,42(6):989-993.

Qian Lijuan,Xiong Hongbing,Lin Jianzhong.The simulation of droplet size distribution in turbulence atomization jet[J].Journal of Engineering Thermophysics,2007,28(2):251-254.
Cai Bin,Li Lei,Wang Zhaolin.Numerical analysis of liquid drop breakup in airflow[J].Journal of Engineering Thermophysics,2003,24(2):613-619.
[15]Gosman A D,Ioannides E.Aspects of computer simulation of liquid-fuelled combustors[J].Journal of Energy,1983,7(6):482-490.


Last Update: 2015-10-31