期刊
PHYSICAL REVIEW FLUIDS
卷 4, 期 6, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevFluids.4.064302
关键词
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资金
- Universite Grenoble Alpes
- Rhone-Alpes region [CPER07_13 CIRA]
The rheology of dense suspensions is studied by discrete-element method simulation, focusing on the interplay of the solid fraction, confining pressure, shear rate, and viscosity. Using a minimal model based on lubrication and contact forces, we are able to recover experimental results available in the literature, in a very large range of solid fractions. We show that bulk friction is only weakly dependent on contact friction when a normalized shear rate, the so-called viscous number I-v is kept constant. In contrast, contact friction has a strong influence on the jamming solid fraction (empty set)(m). We provide empirical proof that all the rheology could be accounted for using I-v and phi/phi(m). By separating the contributions of lubrication and contact forces on the total shear stress, it is shown that contacts dominate at a solid fraction above 0.77 of jamming solid fraction. Universal expressions of macroscopic friction and solid fraction as functions of the viscous number are finally offered.
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