化学工业

化学工业

来源出版物：Chinese Journal of Chemical Engineering，2015，23（4）： 461-470

联系邮箱：Kun Luozjulk@zju.edu.cn

封面介绍：表面更新频率是液膜的基本特性，加速表面更新是强化气液两相传质的重要手段.封面图片给出的是数值模拟圆盘表面液膜更新频率分布特性.普通圆盘上附壁膜加速区更新最快；开窗圆盘开窗区域能形成自由膜，较附壁膜具有更快的表面更新，显现圆盘开窗后的强化.详见本期1407-1416页.

圆盘反应器液膜表面更新数值模拟

邓斌，戴干策

以圆盘反应器的开发和放大为背景，通过理论分析将液膜更新频率与液膜变形相关联，运用VOF模型研究竖直旋转圆盘液膜更新频率空间分布特性；将量纲分析与数值模拟相结合考察影响普通圆盘液膜平均更新频率的相关因素；从表面更新的角度研究自由膜与附壁膜的差异，优化圆盘结构.结果表明：圆盘表面液膜加速区液膜更新频率最快，较其他区域高150%，较平均值高75%；获得了普通圆盘液膜平均更新频率表达式；圆盘开窗形成自由膜，更新频率比附壁膜高40%以上；相同面积圆形窗区域自由膜更新频率比扇形窗自由膜高34%，但是扇形窗自由膜对附壁膜强化作用更明显.

反应器；数值模拟；传质；表面更新；自由膜；附壁膜

来源出版物：化工学报，2015，66（4）： 1407-1416

联系邮箱：戴干策，gcdai@ecust.edu.cn

Accurate level set method for simulations of liquid atomization

Changxiao Shao，Kun Luo，Jianshan Yang，et al.

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 introduced 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 liquid 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 studying the mechanism of spray atomization.

Computational fluid dynamics； Level set method； Spray atomization； Interface capture； Breakup