Geometry-induced asymmetric capillary flow

D. Shou, L. Ye, Jintu Fan, K. Fu, M. Mei, H. Wang, Q. Chen

Research output: Journal article publicationJournal articleAcademic researchpeer-review

59 Citations (Scopus)


When capillary flow occurs in a uniform porous medium, the depth of penetration is known to increase as the square root of time. However, we demonstrate in this study that the depth of penetration in multi-section porous layers with variation in width and height against the flow time is modified from this diffusive-like response, and liquids can pass through porous systems more readily in one direction than the other. We show here in a model and an experiment that the flow time for a negative gradient of cross-sectional widths is smaller than that for a positive gradient at the given total height of porous layers. The effect of width and height of local layers on capillary flow is quantitatively analyzed, and optimal parameters are obtained to facilitate the fastest flow. © 2014 American Chemical Society.
Original languageEnglish
Pages (from-to)5448-5454
Number of pages7
Issue number19
Publication statusPublished - 20 May 2014

ASJC Scopus subject areas

  • General Materials Science
  • Condensed Matter Physics
  • Surfaces and Interfaces
  • Spectroscopy
  • Electrochemistry


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