摘要
液体雾化被广泛应用于工业、农业等领域,雾化过程中液体首先形成液膜,液膜在气液边界层内出现不稳定,导致液膜破碎。因此液膜的不稳定性对液体雾化起着非常重要的作用,有必要对液膜的不稳定性进行研究。采用数值计算的方法对可压缩气体中黏性平面液膜的不稳定性进行了研究,首先对黏性平面液膜和气体的速度分布进行推导,在此基础上采用谱方法对黏性平面液膜的不稳定性进行了研究。研究发现:在正弦和曲张模式下,施加电场会加速平面液膜的破碎;正弦模式比曲张模式更加不稳定,说明正弦模式在平面液膜不稳定中起主导作用;气体Mach数、电Euler数、气体Reynolds数、Weber数和动量通量比的增加会加速液膜的破裂;随着气体边界层与液膜厚度比和液体Reynolds数的增加,扰动波的增长速率降低,液膜变得更加稳定。
Liquid atomization is widely used in industry,agriculture and other fields.During the atomization process,the liquid first forms a liquid film,and the liquid film becomes unstable in the gas-liquid boundary layer,resulting in the liquid film being broken.Therefore,the instability of the liquid film plays a very important role in the liquid atomization,and it is necessary to study the instability of the liquid film.In this paper,the instability of viscous planar liquid film in compressible gas was studied by numerical calculation method.Firstly,the velocity distributions of viscous planar liquid film and gas were derived,based on which the instability of viscous planar liquid film was investigated by spectral methods.It is found that in the sinuous and varicose modes,applying an electric field will accelerate the breakup of the plane liquid film.The sinuous mode is more unstable than the varicose mode,indicating that the sinuous mode plays a leading role in the instability of the plane liquid film.Increases of gas Mach number,electrical Euler number,gas Reynolds number,Weber number and momentum flux ratio accelerate the breakup of the liquid film.With the increase of the thickness ratio of gas boundary layer to liquid film and the liquid Reynolds number,the growth rate of the disturbance wave decreases,and the liquid film becomes more stable.
作者
段润泽
张晓磊
张恒
刘联胜
王海霞
DUAN Run-ze;ZHANG Xiao-lei;ZHANG Heng;LIU Lian-sheng;WANG Hai-xia(School of Energy and Environmental Engineering,Hebei University of Technology,Tianjin 300401,China;Hebei Provincial Key Laboratory of Thermal Science and Energy Clean Utilization Technology,Tianjin 300401,China;Hebei Chengde Heating Group Co.,Ltd,Chengde 067000,China)
出处
《气体物理》
2023年第5期70-82,共13页
Physics of Gases
基金
国家自然科学基金(12042211)
天津市科技计划项目(22YDTPJC00200)
河北省自然基金项目(A2022202010、E2019202460)
河北省重点研发计划项目(19274502D)。
关键词
平面液膜
带电流体
可压缩气体
不稳定性
谱方法
planar liquid film
electrified fluid
compressible gas
instability
spectral method
作者简介
第一作者:段润泽(1984-)男,副教授,主要研究液体雾化过程稳定。E-mail:duanrunze@hebut.edu.cn;通信作者:刘联胜(1970-)男,教授,主要研究生物质能源化利用技术。E-mail:liuliansheng@hebut.edu.cn。
