Apparent slip mechanism between two spheres based on solvent rheology: Theory and implication for the shear thinning of non-Brownian suspensions

作     者：A. Vázquez-Quesada Pep Español M. Ellero 

作者机构：Zienkiewicz Centre for Computational Engineering (ZCCE) Swansea University Bay Campus Swansea SA1 8EN United Kingdom Department of Theoretical Condensed Matter Physics Universidad Autónoma de Madrid Madrid 28049 Spain Departamento de Física Fundamental UNED Apartado 60141 Madrid 28080 Spain Basque Center for Applied Mathematics (BCAM) Alameda de Mazarredo 14 Bilbao 48400 Spain IKERBASQUE Basque Foundation for Science Calle de María Díaz de Haro 3 Bilbao 48013 Spain 

出 版 物：《Physical Review Fluids》 (Phys. Rev. Fluids)

年 卷 期：2018年第3卷第12期

页      面：123302-123302页

核心收录：

基　　金：Welsh Government and Higher Education Funding Council for Wales Ministerio de Economía y Competitividad, MINECO, (FIS2013-47350-C5-1-R, FIS2013-47350-C5-3-R) Ministerio de Ciencia e Innovación, MICINN, (FIS2017-86007-C3-1-P, FIS2017-86007-C3-3-P) 

主　　题：Shear thinning Wall slip Suspensions 

摘      要：Analytical results for the apparent slip between two spheres in a simple biviscous model of a shear-thinning fluid are presented. Velocity profiles and apparent slip lengths along the surfaces are analyzed in order to characterize the physical mechanism. It is shown that in this non-Newtonian model, the effect of shear thinning limited to high-shear rates in the interstitial regions between close spheres can be alternatively interpreted as the onset of an apparent shear-rate-dependent slippage effect. The results of the theory compare well with experiments from the literature showing the presence of surface slip on a particle approaching a planar wall. In terms of implications for suspensions rheology, the present results bridge the “hidden solvent shear-thinning theory [Vázquez-Quesada et al., Phys. Rev. Lett. 117, 108001 (2016)] with slip-based models presented recently [Kroupa et al., Phys. Chem. Chem. Phys. 19, 5979 (2017)] as a possible explanation for the mechanism behind the shear thinning in hard-sphere non-Brownian suspensions.