Abstract

Thermocapillary migration describes an interfacial phenomenon that liquids can spontaneously move from the warm to the cold regions on nonuniformly heated solids. However, it is unknown how liquids react at various interfaces subjected to a thermal gradient. In this study, migration of liquid lubricants at the free surface, the plate/plate interface, and the sphere/plate interface is investigated. The results show that liquid lubricants can easily migrate at the free surface and the plate/plate interface, and the velocity at the free surface is much faster than that at the plate/plate interface. Interestingly, liquid lubricants maintain at the sphere/plate interface for a long time, and a continuous loss of a thin liquid film is observed at the cold side on the plate. The factors that influence the migration performances at these interfaces are examined. Numerical simulations are performed to reveal the mechanism and differences among them.

Graphical Abstract

中文翻译：

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液体润滑剂在不同界面处的热毛细管迁移研究

摘要

热毛细管迁移描述了一种界面现象，即液体可以在加热不均匀的固体上自发地从温暖区域移动到寒冷区域。但是，尚不清楚液体在受到热梯度作用的各种界面如何反应。在这项研究中，研究了液体润滑剂在自由表面，板/板界面以及球/板界面的迁移。结果表明，液体润滑剂很容易在自由表面和板/板界面处迁移，并且自由表面上的速度比在板/板界面处的速度快得多。有趣的是，液体润滑剂在球/板的界面上保持了很长时间，并且在板的冷侧观察到了连续的薄液膜损失。研究了在这些接口上影响迁移性能的因素。进行数值模拟以揭示它们之间的机理和差异。

图形概要