Abstract
We study the Poiseuille flow of a soft-glassy material above the jamming point, where the material flows like a complex fluid with Herschel–Bulkley rheology. Microscopic plastic rearrangements and the emergence of their spatial correlations induce cooperativity flow behavior whose effect is pronounced in presence of confinement. With the help of lattice Boltzmann numerical simulations of confined dense emulsions, we explore the role of geometrical roughness in providing activation of plastic events close to the boundaries. We probe also the spatial configuration of the fluidity field, a continuum quantity which can be related to the rate of plastic events, thereby allowing us to establish a link between the mesoscopic plastic dynamics of the jammed material and the macroscopic flow behaviour.
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Notes
For the Voronoi analysis we used the tools included in the voro++ libraries available at http://math.lbl.gov/voro++/.
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Acknowledgments
The authors kindly acknowledge funding from the European Research Council under the European Community’s Seventh Framework Programme (FP7/2007-2013)/ERC Grant Agreement No. 279004.
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Scagliarini, A., Sbragaglia, M. & Bernaschi, M. Mesoscopic Simulation Study of Wall Roughness Effects in Micro-channel Flows of Dense Emulsions. J Stat Phys 161, 1482–1495 (2015). https://doi.org/10.1007/s10955-015-1374-y
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DOI: https://doi.org/10.1007/s10955-015-1374-y