Computational fluid dynamics is an efficient numerical approach for spray atomization study, but it is challenging to accurately capture the gas-liquid interface. In this work, an accurate conservative level set metho...Computational fluid dynamics is an efficient numerical approach for spray atomization study, but it is challenging to accurately capture the gas-liquid interface. In this work, an accurate conservative level set method is intro- duced to accurately track the gas-liquid interfaces in liquid atomization. To validate the capability of this method, binary drop collision and drop impacting on liquid film are investigated. The results are in good agreement with experiment observations. In addition, primary atomization （swirling sheet atomization） is studied using this method. To the swirling sheet atomization, it is found that Rayleigh-Taylor instability in the azimuthal direction causes the primary breakup of liquid sheet and complex vortex structures are clustered around the rim of the liq- uid sheet. The effects of central gas velocity and liquid-gas density ratio on atomization are also investigated. This work lays a solid foundation for further studvin~ the mechanism of s^rav atomization.展开更多
In this paper,the mechanisms of particle movement on an electric curtain are examined.Intermittent bursts in which particles leaping from a surface of an electric curtain are demonstrated both by numerical simulation ...In this paper,the mechanisms of particle movement on an electric curtain are examined.Intermittent bursts in which particles leaping from a surface of an electric curtain are demonstrated both by numerical simulation and experimental observation.The hopping and surfing modes during particle removal are shown to depend on the particle electric charge and its initial position.The particles initially located on the top of electrode have a large electric charge tend to assume a hopping mode.Transverse movement of the particle initially located between the electrodes is analyzed,and the particle traps along the electric curtain surface are also observed.展开更多
基金the National Natural Science Foundation of China(51176170,51276163)the Zhejiang Provincial Natural Science Foundation for Distinguished Young Scholars(LR12E06001)supported by the Fundamental Research Funds for the Central Universities
文摘Computational fluid dynamics is an efficient numerical approach for spray atomization study, but it is challenging to accurately capture the gas-liquid interface. In this work, an accurate conservative level set method is intro- duced to accurately track the gas-liquid interfaces in liquid atomization. To validate the capability of this method, binary drop collision and drop impacting on liquid film are investigated. The results are in good agreement with experiment observations. In addition, primary atomization （swirling sheet atomization） is studied using this method. To the swirling sheet atomization, it is found that Rayleigh-Taylor instability in the azimuthal direction causes the primary breakup of liquid sheet and complex vortex structures are clustered around the rim of the liq- uid sheet. The effects of central gas velocity and liquid-gas density ratio on atomization are also investigated. This work lays a solid foundation for further studvin~ the mechanism of s^rav atomization.
基金supported by the National Natural Science Foundation of China (Grant No.11002023)the Doctoral Fund of Ministry of Education of China (Grant No. 20091101120004) Beijing Institute of Technology Science Foundation (Grant No. 20090142011)
文摘In this paper,the mechanisms of particle movement on an electric curtain are examined.Intermittent bursts in which particles leaping from a surface of an electric curtain are demonstrated both by numerical simulation and experimental observation.The hopping and surfing modes during particle removal are shown to depend on the particle electric charge and its initial position.The particles initially located on the top of electrode have a large electric charge tend to assume a hopping mode.Transverse movement of the particle initially located between the electrodes is analyzed,and the particle traps along the electric curtain surface are also observed.
