This article investigates the effect of rim charges on the macroscopic flow behavior of platelike particle suspensions in Couette flow. Fluid-solid coupling is achieved using the lattice spring direct-forcing immersed boundary lattice Boltzmann method. Platelike particles are equipped with rim charges to simulate the inhomogeneous charge distribution commonly observed in clay particles. By examining suspensions with varying numbers of platelike particles, it has been found that rim charges induce particle clustering in shear flow. At low shear rates, inter-particle electrostatic forces drive the formation of large clusters, resulting in higher suspension viscosity. As the shear rate increases, hydrodynamic forces break large clusters into smaller ones, leading to a decrease in shear viscosity. Orientation correlation function calculations indicate that rim charges on platelike particles promote the formation of house-of-cards (HoC) microstructures in suspensions, and these microstructures transform from HoC-dominant to overlapping coins-dominant as shear flow grows stronger. Additionally, investigations of suspensions with larger aspect ratios reveal that the average cluster volume is the primary factor influencing the viscosity of rim-charged platelike particle suspensions, especially under conditions where electrostatic forces dominate. Our results provide insights into the relationship between particle clusters and macroscopic flow properties in clay systems.
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Research Article|
March 17 2025
Microstructure and rheology of rim-charged platelike particle suspensions: A numerical study
Jinhe Wang
;
Jinhe Wang
State Key Laboratory of Fluid Power and Mechatronic Systems and Department of Engineering Mechanics, Zhejiang University
, Hangzhou 310027, China
and Innovation Center of Yangtze River Delta, Zhejiang University
, Jiaxing 314102, China
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Dingyi Pan
Dingyi Pan
a)
State Key Laboratory of Fluid Power and Mechatronic Systems and Department of Engineering Mechanics, Zhejiang University
, Hangzhou 310027, China
and Innovation Center of Yangtze River Delta, Zhejiang University
, Jiaxing 314102, China
a)Author to whom correspondence should be addressed; electronic mail: [email protected]
Search for other works by this author on:
Jinhe Wang
Dingyi Pan
a)
State Key Laboratory of Fluid Power and Mechatronic Systems and Department of Engineering Mechanics, Zhejiang University
, Hangzhou 310027, China
and Innovation Center of Yangtze River Delta, Zhejiang University
, Jiaxing 314102, China
a)Author to whom correspondence should be addressed; electronic mail: [email protected]
J. Rheol. 69, 267–280 (2025)
Article history
Received:
July 08 2024
Accepted:
February 23 2025
Citation
Jinhe Wang, Dingyi Pan; Microstructure and rheology of rim-charged platelike particle suspensions: A numerical study. J. Rheol. 1 May 2025; 69 (3): 267–280. https://doi.org/10.1122/8.0000899
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