Atypical plug formation in internal elastoviscoplastic fluid flows over a non-smooth topology
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.
Keywords
Cite
@article{arxiv.2301.09100,
title = {Atypical plug formation in internal elastoviscoplastic fluid flows over a non-smooth topology},
author = {Miguel E. Villalba and Masoud Daneshi and Emad Chaparian and D. Mark Martinez},
journal= {arXiv preprint arXiv:2301.09100},
year = {2023}
}