The role of shear and elongation in the flow of solutions of semi-flexible polymers through porous media

Juan M. González, Alejandro J. Müller, Miguel F. Torres, A. Eduardo Sáez

Research output: Contribution to journalArticle

35 Scopus citations


The rheological behavior of hydrophobically modified hydroxyethyl cellulose (HMHEC) and xanthan gum solutions has been characterized in simple shear flow, opposed-jets flow, and flow through porous media. Both polymers exhibit shear thinning in simple shear flow and apparent shear thinning in flow through porous media. Analysis of the results shows there is a direct correspondence between shear viscosities determined in simple shear experiments and apparent viscosities in porous media flow at relatively low shear rates. At high shear rates the extensional component of the flow in porous media appreciably increases the apparent viscosity over the simple shear values. This increase is shown to correlate with results obtained in opposed-jets experiments, and is attributed to formation of transient entanglements.

Original languageEnglish (US)
Pages (from-to)396-405
Number of pages10
JournalRheologica Acta
Issue number4
StatePublished - Apr 1 2005



  • Hydrophobically modified hydroxyethyl cellulose
  • Porous media
  • Xanthan gum

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics

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