Atypical plug formation in internal elastoviscoplastic fluid flows over non-smooth topologies
Villalba, Miguel E. and Daneshi, Masoud and Chaparian, Emad and Martinez, D. Mark (2023) Atypical plug formation in internal elastoviscoplastic fluid flows over non-smooth topologies. Journal of Non-Newtonian Fluid Mechanics, 319. 105078. ISSN 0377-0257 (https://doi.org/10.1016/j.jnnfm.2023.105078)
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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.
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Item type: Article ID code: 85867 Dates: DateEvent30 September 2023Published7 June 2023Published Online3 June 2023AcceptedSubjects: Technology > Mechanical engineering and machinery Department: Faculty of Engineering > Mechanical and Aerospace Engineering Depositing user: Pure Administrator Date deposited: 20 Jun 2023 14:14 Last modified: 06 Aug 2024 01:50 URI: https://strathprints.strath.ac.uk/id/eprint/85867