期刊
COMPUTERS & FLUIDS
卷 230, 期 -, 页码 -出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.compfluid.2021.105115
关键词
Suspensions; Rheology; Shear reversal; Time-varying shear; Immersed boundary-lattice Boltzmann method
资金
- Synthesis and Solid State Pharmaceutical Centre (SSPC) - Science Foundation Ireland (SFI)
- European Regional Development Fund [14/SP/2750]
- Irish Centre for High-End Computing (ICHEC)
- Science Foundation Ireland (SFI) [14/SP/2750] Funding Source: Science Foundation Ireland (SFI)
The research utilized an immersed boundary-lattice Boltzmann method to study the response of dense granular suspensions to time-varying shear rates and flow reversals. The results showed that the contribution of tangential lubrication corrections to shear stress is dominant when solid concentration exceeds 30%. Weak shear-thinning was found for intermediate solids fractions, while weak shear-thickening was observed for solid concentrations above 40%.
Using an immersed boundary-lattice Boltzmann method, we investigated the response of dense granular suspensions to time-varying shear rates and flow reversals. The evolution of the relative apparent viscosity and particle structures was analysed. The concentration of solids (phi(v)) and particle Reynolds numbers (Re-p) were varied over the ranges 6% <= phi(v) <= 47% and 0.105 <= Re-p <= 0.529. The simulations included sub-grid scale corrections for unresolved lubrication forces and torques (normal and tangential). When phi(v) surpasses 30%, the contribution of the tangential lubrication corrections to the shear stress is dominant. While for intermediate solids fractions we find weak shear-thinning, we see weak shear-thickening for phi(v) > 40%. We show how the structure and apparent viscosity of a suspension evolves after a reversal of the shear direction. For 47% solids, simulations with step changes in the shear rate show the effects of the previous shear history on the viscosity of the suspension.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据