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Criterion for Fingering Instabilities in Colloidal Gels
Name
PhysRevLett.124.248006.pdf
Description
Published version
Size
463.66 KB
Format
Adobe PDF
Checksum (MD5)
daab741272c35bb62231106e19421973
Author(s)
Divoux, Thibaut
Shukla, Asheesh
Marsit, Badis
Kaloga, Yacouba
Bischofberger, Irmgard
Date Issued
2020
Journal
Physical Review Letters
Publisher
American Physical Society (APS)
Citation
Divoux, Thibaut, Shukla, Asheesh, Marsit, Badis, Kaloga, Yacouba and Bischofberger, Irmgard. 2020. "Criterion for Fingering Instabilities in Colloidal Gels." Physical Review Letters, 124 (24).
Version
Final published version
Abstract
© 2020 American Physical Society. We sandwich a colloidal gel between two parallel plates and induce a radial flow by lifting the upper plate at a constant velocity. Two distinct scenarios result from such a tensile test: (i) stable flows during which the gel undergoes a tensile deformation without yielding, and (ii) unstable flows characterized by the radial growth of air fingers into the gel. We show that the unstable regime occurs beyond a critical energy input, independent of the gel's macroscopic yield stress. This implies a local fluidization of the gel at the tip of the growing fingers and results in the most unstable wavelength of the patterns exhibiting the characteristic scalings of the classical viscous fingering instability. Our work provides a quantitative criterion for the onset of fingering in colloidal gels based on a local shear-induced yielding in agreement with the delayed failure framework.
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DOI of Published Version
10.1103/PHYSREVLETT.124.248006
