Please use this identifier to cite or link to this item: doi:10.22028/D291-38923
Title: Effect of viscoelasticity on displacement processes in porous media
Author(s): Jung, Michael
Shakeri, Pegah
Seemann, Ralf
Language: English
Title: Frontiers in Physics
Volume: 11
Publisher/Platform: Frontiers
Year of Publication: 2023
Free key words: porous media
viscoelastic flow
purley elastic instability
elastic secondary flow
capillary entrapment
DDC notations: 500 Science
Publikation type: Journal Article
Abstract: Improving the displacement efficiency of capillary entrapments in porous media by adding high molecular weight polymers to the invading phase has various industrial applications, from enhanced oil recovery to soil remediation. Apart from an increased viscosity contrast compared to regular water flooding, the flow of viscoelastic polymer solutions exhibits unstable flow behavior even at small Reynolds numbers, which can lead to an additional displacement mechanism of the capillary entrapments. In this work, we employ a microfluidic approach to unravel the underlying physics and mechanism of this enhanced pore scale displacement. To this end, we show that the major complex topological flow features in a typical porous medium can be mimicked by a flow geometry consisting of a single capillary entrapment connected to two symmetric serpentine channels. This design excludes the effect of viscous stresses and allows direct focus on displacement processes driven solely by elastic stresses. We show that the unique viscoelastic fluid features, such as the significant storage and release of elastic stresses and first normal stress difference, combined with the flow geometry, lead to purely elastic instability and secondary flow, which in turn provide the stresses necessary to overcome the capillary threshold and displace the capillary entrapment.
DOI of the first publication: 10.3389/fphy.2023.1099073
URL of the first publication:
Link to this record: urn:nbn:de:bsz:291--ds-389235
ISSN: 2296-424X
Date of registration: 6-Feb-2023
Description of the related object: Supplementary material
Related object:
Faculty: NT - Naturwissenschaftlich- Technische Fakultät
Department: NT - Physik
Professorship: NT - Prof. Dr. Ralf Seemann
Collections:SciDok - Der Wissenschaftsserver der Universität des Saarlandes

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