采用可调节表面张力的大密度比格子玻尔兹曼伪势模型模拟了液滴倾斜撞击液膜的过程,分析了不同雷诺数、韦伯数、液膜厚度和碰撞角对液冠演化的影响。结果表明: 碰撞时能量损失随着雷诺数增大而减小,但随着液膜厚度增大而增大;上下游液冠高度均随着雷诺数、韦伯数和碰撞角的增大而增大;同时上下游液冠高度随着液膜厚度的变化呈现先增大后减小的趋势,液膜厚度为0.25倍液滴半径时达到最大值。液冠延伸长度同样随着雷诺数和碰撞角增大而增大,但并不随着韦伯数的增大而变化,同时液冠延伸长度随着液膜厚度增加而减小。
Abstract
The process of droplets splashing on liquid film is simulated using a large-density lattice Boltzmann pseudo-potential model with tunable surface tension. The effects of Reynolds number, Weber number, liquid film thickness, and collision angle on the evolution of the liquid crown are analyzed. Results demonstrate that the energy loss during the impact decreases with the increase of Reynolds number, but augments with the thickening of liquid film; the upstream and downstream crown heights both rise with the increase of Reynolds number, Weber number, and collision angle, but reduce after increment with the change of film thickness, and peaks when liquid film thickness is 0.25 times of droplet radius. The crown extension length also increases with the growing of Reynolds number and collision angle, but does not vary with the increase of Weber number, and meanwhile shrinks with the thickening of liquid film.
关键词
格子玻尔兹曼方法 /
伪势模型 /
倾斜撞击 /
液冠演化 /
液冠飞溅
Key words
lattice Boltzmann method /
pseudo-potential model /
oblique impact /
crown evolution /
crown splashing
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基金
国家重点研发计划项目(2016YFC0402006);国家自然科学基金项目(51979183);贵州省交通运输厅科技项目(2018221007)
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