Elastic instabilities during the flow of hydrolyzed polyacrylamide solution in porous media: effect of pore-shape and salt

Durgesh Kawale, Esteban Marques, Pacelli L J Zitha, Michiel T. Kreutzer, William R. Rossen, Pouyan E. Boukany*

*Corresponding author for this work

Research output: Contribution to journalArticleScientificpeer-review

57 Citations (Scopus)

Abstract

We experimentally investigate the flow of hydrolyzed polyacrylamide (HPAM) solution with and without salt in model porous media at high Weissenberg numbers (Wi > 1.0). The effect of pore shapes on the flow pattern and pressure drop is explored by using periodic arrays of circular and square pillars in aligned and staggered layouts. In the apparent shear-thinning regime, we observe stationary dead zones upstream of the pillars. In addition, we confirm that the size of stationary dead zones correlates with the level of shear-thinning, by varying the amount of salt in HPAM solution. At higher shear rates (or Wi), these dead zones are periodically washed away. We present the mechanism of this elastic instability and characterize it based on the pressure drop fluctuation spectral density.

Original languageEnglish
Pages (from-to)765-775
Number of pages11
JournalSoft Matter
Volume13
Issue number4
DOIs
Publication statusPublished - 2017

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