Capillary filling in microchannels patterned by posts

Details Capillary filling in microchannels patterned by posts Capillary filling in microchannels patterned by posts

2009-10-27

arxiv.org/abs/0910.5216v2

Physics

Condensed Matter

Soft Condensed Matter

To appear in Phys. Rev. E

Scientific paper

We investigate the capillary filling of three dimensional micro-channels with surfaces patterned by posts of square cross section. We show that pinning on the edges of the posts suppresses, and can halt, capillary filling. We stress the importance of the channel walls in controlling whether filling can occur. In particular for channels higher than the distance between adjacent posts, filling occurs for contact angles less than a threshold angle \sim 55 deg., independent of the height of the channel.

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