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Shear thickening and history-dependent rheology of monodisperse suspensions with finite inertia via an immersed boundary lattice Boltzmann method

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dc.contributor.author Srinivasan, Sudharsan
dc.contributor.author Van den Akker, Harry E.A.
dc.contributor.author Shardt, Orest
dc.date.accessioned 2020-04-09T15:21:53Z
dc.date.issued 2020
dc.identifier.uri http://hdl.handle.net/10344/8714
dc.description This the pre-print of an article submitted to International Journal of Multiphase Flow,Volume 125, April 2020, 103205. The final published version is available at http://dx.doi.org/10.1016/j.ijmultiphaseflow.2019.103205
dc.description.abstract Three-dimensional direct numerical simulations of dense suspensions of monodisperse spherical particles in simple shear flow have been performed at particle Reynolds numbers between 0.1 and 0.6. The particles translate and rotate under the influence of the applied shear. The lattice Boltzmann method was used to solve the flow of the interstitial Newtonian liquid, and an immersed boundary method was used to enforce the no-slip boundary condition at the surface of each particle. Short range spring forces were applied between colliding particles over sub-grid scale distances to prevent overlap. We computed the relative apparent viscosity for solids volume fractions up to 38% for several shear rates and particle concentrations and discuss the effects of these variables on particle rotation and cluster formations. The apparent viscosities increase with increasing particle Reynolds number (shear thickening) and solids fraction. As long as the particle Reynolds number is low (0.1), the computed viscosities are in good agreement with experimental measurements, as well as theoretical and empirical equations. For higher Reynolds numbers, we find much higher viscosities, which we relate to slower particle rotation and clustering. Simulations with a sudden change in shear rate also reveal a history (or hysteresis) effect due to the formation of clusters. We quantify the changes in particle rotation and clustering as a function of the Reynolds number and volume fraction. en_US
dc.language.iso eng en_US
dc.publisher Elsevier en_US
dc.relation.ispartofseries International Journal of Multiphase Flow;125, 103205
dc.relation.uri http://dx.doi.org/10.1016/j.ijmultiphaseflow.2019.103205
dc.rights This the pre-print of an article submitted to International Journal of Multiphase Flow,Volume 125, April 2020, 103205. The final published version is available at http://dx.doi.org/10.1016/j.ijmultiphaseflow.2019.103205 en_US
dc.subject rheology en_US
dc.subject suspensions en_US
dc.subject immersed boundary method en_US
dc.subject shear flow en_US
dc.title Shear thickening and history-dependent rheology of monodisperse suspensions with finite inertia via an immersed boundary lattice Boltzmann method en_US
dc.type info:eu-repo/semantics/article en_US
dc.type.supercollection all_ul_research en_US
dc.identifier.doi 10.1016/j.ijmultiphaseflow.2019.103205
dc.date.embargoEndDate 2022-01-11
dc.embargo.terms 2022-01-11 en_US
dc.rights.accessrights info:eu-repo/semantics/embargoedAccess en_US


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