Inclusion of DLVO forces in simulations of non-Brownian solid suspensions: Rheology and structure

被引:6
|
作者
Srinivasan, Sudharsan [1 ,2 ,3 ]
Van den Akker, Harry E. A. [1 ,2 ,3 ,4 ]
Shardt, Orest [1 ,2 ,3 ]
机构
[1] Univ Limerick, Synth & Solid State Pharmaceut Ctr SSPC, Limerick V94 T9PX, Ireland
[2] Univ Limerick, Bernal Inst, Limerick V94 T9PX, Ireland
[3] Univ Limerick, Sch Engn, Limerick V94 T9PX, Ireland
[4] Delft Univ Technol, Transport Phenomena Lab, Dept Chem Engn, Maasweg 9, NL-2629 HZ Delft, Netherlands
基金
爱尔兰科学基金会;
关键词
Rheology; Suspensions; Aqueous electrolyte; Lubrication corrections; DLVO forces; Immersed boundary-Lattice Boltzmann method; LATTICE BOLTZMANN METHOD; DIRECT NUMERICAL SIMULATIONS; PARTICULATE SUSPENSIONS; DENSE; PARTICLES; MICROSTRUCTURE; DYNAMICS; EQUATION; CONTACT; MODEL;
D O I
10.1016/j.ijmultiphaseflow.2021.103929
中图分类号
O3 [力学];
学科分类号
08 ; 0801 ;
摘要
The understanding of the rheological behaviour of suspensions in aqueous electrolytes is necessary for the optimal design of hydraulic transport lines. In these applications, particle size is at least 10 micron, and the particle Reynolds number, Re-p, is finite: O(10(-1)). Although there are some experimental and numerical data on the rheology of such suspensions, the number of detailed analyses is limited. Therefore, 3-D direct numerical simulations of dense suspensions in aqueous electrolytes are conducted to assess the dynamics of the relative apparent viscosity and particle structures. The solid-liquid interfaces are resolved, and the flow is simulated, employing an in-house immersed boundary-lattice Boltzmann method code. In addition to the hydrodynamics resolved in the computational grid, our simulations include unresolved sub-grid scale lubrication corrections and non-contact electric double layer (EDL) and Van der Waals forces for a wide range of particle volume fractions, phi(v), at a single Re-p = 0.1. Under these conditions, the contribution of the Van der Waals force was found to be weak. With an increase in phi(v), the effect of EDL forces decreased the relative apparent viscosity. Particle layering and structural arrangements were analysed for phi(v) = 43 and 52%. As the Debye length (i.e., the thickness of EDL) decreases, the particle layers near the walls weakened. The analyses reveal how at these high volume fractions, chain-like assemblies are transformed into hexagonal arrangements.
引用
收藏
页数:15
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