Structural evolution of colloidal gels during constricted microchannel flow

Jacinta C. Conrad, Jennifer A. Lewis

Research output: Contribution to journalArticlepeer-review


We investigate the structure of colloidal gels flowing through constrictions in microchannels using confocal microscopy. As the gel traverses the constricted region, both the average velocity and particle density increase downstream. While the average flow profile is smoothly varying, stagnation zones develop at the constriction entry, leading to markedly nonuniform local flow profiles. Dense clusters undergo shear-induced yielding at intercluster boundaries, which enhances the structural heterogeneity of the suspension at the constriction outlet.

Original languageEnglish (US)
Pages (from-to)6102-6107
Number of pages6
Issue number9
StatePublished - May 4 2010

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics
  • Surfaces and Interfaces
  • Spectroscopy
  • Electrochemistry


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