Thermo-capillary migration is a phenomenon in which thermal gradients drive a liquid to flow without any external force. It is important to prevent the migration of liquid lubricants for moving mechanisms. This study aimed to investigate the influence of micro-grooves patterns on the migration of paraffin oil and obtain a design concept of micro-grooves patterns to obstruct the migration. Micro-grooves patterns with different orientations and geometric parameters were fabricated on the surface of SUS 316 stainless steel. Migration experiments of paraffin oils on each specimen were performed under various temperature gradients. The results indicated that micro-grooves patterns strongly modified the thermo-capillary migration. Micro-grooves perpendicular to the temperature gradient obstructed the migration effectively, while micro-grooves parallel to the temperature gradient accelerated the migration. The width and depth of micro-grooves influenced the migration behavior obviously, and the effects of these geometric parameters were discussed in detail.

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