Capillary filling in patterned channels

H. Kusumaatmaja*, C. M. Pooley, S. Girardo, D. Pisignano, J. M. Yeomans

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

Abstract / Description of output

We show how the capillary filling of microchannels is affected by posts or ridges on the sides of the channels. Ridges perpendicular to the flow direction introduce contact line pinning, which slows, or sometimes prevents, filling, whereas ridges parallel to the flow provide extra surface that may enhance filling. Patterning the microchannel surface with square posts has little effect on the ability of a channel to fill for equilibrium contact angle theta(e)less than or similar to 30 degrees. For theta(e)greater than or similar to 60 degrees, however, even a small number of posts can pin the advancing liquid front.

Original languageEnglish
Article number067301
Number of pages4
JournalPhysical Review E
Issue number6
Publication statusPublished - Jun 2008

Keywords / Materials (for Non-textual outputs)

  • FLOW
  • RISE


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