Atypical plug formation in internal elastoviscoplastic fluid flows over non-smooth topologies

Miguel E. Villalba, Masoud Daneshi, Emad Chaparian, D. Mark Martinez

Research output: Contribution to journalArticlepeer-review

Abstract

An experimental and computational investigation of the internal flow of elastoviscoplastic fluids over non-smooth topologies is presented in two complimentary studies. In the first study, we visualize the creeping flow of a Carbopol gel over a cavity embedded in a thin slot using Optical Coherence Tomography (OCT) and confocal microscopy. We measure the size and shape of the plug as a function of Bingham and Weissenberg numbers. An asymmetry in the plug shape is observed which is also evident in our second study—numerical simulations using adaptive finite element method based upon an augmented Lagrangian scheme. We quantify the asymmetry and present the results as a function of the product of the Weissenberg and Bingham numbers which collapse onto a single curve for each of these geometries. These findings underscore the theoretical underpinnings of the synergy between elasticity and plasticity of these complex fluids.
Original languageEnglish
Article number105078
JournalJournal of Non-Newtonian Fluid Mechanics
Volume319
Early online date7 Jun 2023
DOIs
Publication statusPublished - 30 Sept 2023

Keywords

  • elastoviscoplastic fluids
  • creeping flow
  • non-smooth topologies
  • plug formation

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