Show simple item record

dc.contributor.authorKumar, S.S.P.
dc.contributor.authorVazquez-Quesada, A.
dc.contributor.authorEllero, M.
dc.description.abstractThis 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.rightsReconocimiento-NoComercial-CompartirIgual 3.0 Españaen_US
dc.subjectNon-colloidal suspensionsen_US
dc.subjectBiviscous matrixen_US
dc.subjectYield stress fluidsen_US
dc.subjectShear thinning suspensionsen_US
dc.subjectLubrication dynamicsen_US
dc.subjectNumerical simulationen_US
dc.subjectSemi-implicit integrationen_US
dc.titleNumerical investigation of the rheological behavior of a dense particle suspension in a biviscous matrix using a lubrication dynamics methoden_US
dc.journal.titleJournal of Non-Newtonian Fluid Mechanicsen_US

Files in this item


This item appears in the following Collection(s)

Show simple item record

Reconocimiento-NoComercial-CompartirIgual 3.0 España
Except where otherwise noted, this item's license is described as Reconocimiento-NoComercial-CompartirIgual 3.0 España