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 flm is observed at the cold side on the plate. The factors that infuence the migration performances at these interfaces are examined. Numerical simulations are performed to reveal the mechanism and diferences among them.

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