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

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 pilla...

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Veröffentlicht in:	Soft matter 2017, Vol.13 (4), p.765-775
Hauptverfasser:	Kawale, Durgesh, Marques, Esteban, Zitha, Pacelli L J, Kreutzer, Michiel T, Rossen, William R, Boukany, Pouyan E
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Sprache:	eng
Schlagworte:	Elastic instability Mathematical models Media Pillars Polyacrylamides Porous media Pressure drop Spectra
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creator	Kawale, Durgesh Marques, Esteban Zitha, Pacelli L J Kreutzer, Michiel T Rossen, William R Boukany, Pouyan E
description	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.
doi_str_mv	10.1039/c6sm02199a
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source	Royal Society Of Chemistry Journals 2008-; Alma/SFX Local Collection
subjects	Elastic instability Mathematical models Media Pillars Polyacrylamides Porous media Pressure drop Spectra
title	Elastic instabilities during the flow of hydrolyzed polyacrylamide solution in porous media: effect of pore-shape and salt
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