dc.contributor.author Kumar, S.S.P. dc.contributor.author Vazquez-Quesada, A. dc.contributor.author Ellero, M. dc.date.accessioned 2021-01-04T15:45:59Z dc.date.available 2021-01-04T15:45:59Z dc.date.issued 2020-05-19 dc.identifier.issn 0377-0257 dc.identifier.uri http://hdl.handle.net/20.500.11824/1228 dc.description.abstract This paper presents a numerical approach to predict the rheology of dense non-colloidal suspensions with a biviscous matrix. A biviscous matrix is characterized as a fluid with two shear rate dependent viscosities i.e. one above and below a critical shear rate $\dot{\gamma}_c$ . The methodology is based on the lubrication dynamics which dominantly influence the suspension properties at high values of particle concentration. To efficiently handle the singular lubrication forces in the dense suspensions, a semi-implicit splitting integration scheme is employed. Using the presented approach, three dimensional simulations were performed and the predicted rheology of the suspension with a biviscous matrix is discussed under two regimes: (a) $\dot{\gamma}_c$ larger than the macroscopic applied shear rate where fluid slippage effect can be modeled in terms of the non-Newtonian properties of the matrix, and (2) $\dot{\gamma}_c$ smaller than the macroscopic applied shear rate where a biviscous model can be seen as a regularization of an apparent yield stress matrix. The results obtained at high $\dot{\gamma}_c$ show that the shear thinning of the biviscous matrix in the inter-particle gaps, which can be interpreted as an apparent fluid slipping on the particle surface, provides an alternative mechanism to explain the experimentally observed shear-thinning of non-colloidal suspension with Newtonian matrices. At low γ̇c values, the predicted suspension properties and its microstructure corroborates the available experimental results on suspensions with yield stress fluids. en_US dc.format application/pdf en_US dc.language.iso eng en_US dc.rights Reconocimiento-NoComercial-CompartirIgual 3.0 España en_US dc.rights.uri http://creativecommons.org/licenses/by-nc-sa/3.0/es/ en_US dc.subject Non-colloidal suspensions en_US dc.subject Biviscous matrix en_US dc.subject Yield stress fluids en_US dc.subject Shear thinning suspensions en_US dc.subject Lubrication dynamics en_US dc.subject Numerical simulation en_US dc.subject Semi-implicit integration en_US dc.title Numerical investigation of the rheological behavior of a dense particle suspension in a biviscous matrix using a lubrication dynamics method en_US dc.type info:eu-repo/semantics/article en_US dc.identifier.doi https://doi.org/10.1016/j.jnnfm.2020.104312 dc.relation.publisherversion https://doi.org/10.1016/j.jnnfm.2020.104312 en_US dc.relation.projectID ES/1PE/SEV-2017-0718 en_US dc.relation.projectID ES/2PE/RTI2018-094595-B-I00 en_US dc.relation.projectID EUS/BERC/BERC.2018-2021 en_US dc.relation.projectID EUS/ELKARTEK en_US dc.rights.accessRights info:eu-repo/semantics/openAccess en_US dc.type.hasVersion info:eu-repo/semantics/acceptedVersion en_US dc.journal.title Journal of Non-Newtonian Fluid Mechanics en_US
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