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Phase field modeling of liquid jets in low gravity

机译：低重力液体射流的相场建模

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An axisymmetric phase field model is developed and used to model surface tension forces on liquid jets in microgravity. The previous work in this area is reviewed and a baseline drop tower experiment selected for model comparison. The model is solved numerically with a compact fourth order stencil on an equally spaced axisymmetric grid. After grid convergence studies, a grid is selected and all drop tower tests modeled. Agreement was assessed by comparing predicted and measured free surface rise. Trend wise agreement is good but agreement in magnitude is only fair. Suspected sources of disagreement are the simple turbulence model and the existence of slosh baffles in the experiment that were not included in the model. Parametric investigation was conducted to study the influence of key parameters on the geysers formed by jets in microgravity. Investigation of the contact angle showed the expected trend of increasing contact angle increasing geyser height. Investigation of the tank radius showed some interesting effects and demonstrated the zone of free surface deformation is quite large. Variation of the surface tension with a laminar jet showed clearly the evolution of free surface shape with Weber number. A breakthrough Weber number of 1 was predicted by the variation of the surface tension model which is close to the experimentally measured Weber number of 1.5 found in prior experimental work. Published by Elsevier Inc.
机译：开发了轴对称相场模型，并将其用于对微重力下液体射流上的表面张力进行建模。回顾了该领域的先前工作，并选择了基线落塔实验进行模型比较。在等距的轴对称网格上使用紧凑的四阶模版对模型进行数值求解。在网格收敛研究之后，选择一个网格并对所有落塔测试进行建模。通过比较预测和测量的自由表面上升来评估一致性。趋势明智的协议是好的，但是在数量上的协议只是公平的。怀疑的分歧源是简单的湍流模型和实验中存在的晃动折流板（未包含在模型中）。进行了参数研究，以研究关键参数对微重力射流形成的间歇泉的影响。接触角的研究显示出增加接触角，增加间歇泉高度的预期趋势。对储罐半径的研究显示出一些有趣的效果，并证明了自由表面变形的区域相当大。层流射流引起的表面张力变化清楚地表明了自由表面形状随韦伯数的变化。通过表面张力模型的变化预测突破的韦伯数为1，该变化接近先前实验工作中通过实验测得的韦伯数1.5。由Elsevier Inc.发布

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