Polymer conformation during flow in porous media

Durgesh Kawale, Gelmer Bouwman, Shaurya Sachdev, Pacelli Zitha, Michiel Kreutzer, Bill Rossen, Pouyan Boukany

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Molecular conformations of individual polymers during flow through porous media are directly observed by single-DNA imaging in microfluidics. As the Weissenberg number increases during flow (Wi > 1), we observe two types of elastic instabilities: (a) stationary dead-zone and (b) time-dependant dead-zone washing. When stretched polymer chains enter a dead-zone, they first re-coil and, once inside the dead-zone, they rotate and re-stretch again. The probability distribution of DNA chains under the stretched condition inside the dead-zone is found to be heterogeneous with a broad distribution.
Original languageEnglish
Pages (from-to)8745-8755
Number of pages11
JournalSoft Matter
Issue number46
Publication statusPublished - Oct 2017


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