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Thin film dynamics on a vertically rotating disk partially immersed in a liquid bath

机译:垂直浸入液体浴中的垂直旋转磁盘上的薄膜动力学

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摘要

The axisymmetric flow of a thin liquid film is considered for the problem of a vertically rotating disk that is partially immersed in a liquid bath. A model for the fully three-dimensional free boundary problem of the rotating disk, that drags a thin film out of the bath is set up. From this, a dimension-reduced extended lubrication approximation that includes the meniscus region is derived. This problem constitutes a generalization of the classic drag-out and drag-in problem to the case of axisymmetric flow. The resulting nonlinear fourth-order partial differential equation for the film profile is solved numerically using a finite element scheme. For a range of parameters steady states are found and compared to asymptotic solutions. Patterns of the film profile, as a function of immersion depth and angular velocity are discussed.
机译:考虑到垂直旋转的盘部分浸入液体浴中的问题,认为薄膜的轴对称流动。建立了旋转盘的全三维自由边界问题的模型,该模型将薄膜从熔池中拉出。由此得出包括弯液面区域的尺寸减小的扩展润滑近似。这个问题构成了经典的拉出和拉入问题对轴对称流的推广。使用有限元方案对所得的膜轮廓非线性四阶偏微分方程进行数值求解。对于一系列参数,找到稳态并将其与渐近解进行比较。讨论了薄膜轮廓的图案,作为浸入深度和角速度的函数。

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