Rheology of bentonite dispersions: Role of ionic strength and solid content

Lin, Yuan; Qin, Huaitao; Guo, Jin; Chen, Jiawang

doi:10.1016/j.clay.2021.106275

Cited by 13 publications

(5 citation statements)

References 33 publications

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“…These, however, require a much larger computation domain as well as the time cost. Furthermore, particles in the bentonite sediment are cohesive, which results in particle aggregation and promotes settling of the sediment [29,30]. This property has not been considered in the present numerical simulation.…”

Section: Resultsmentioning

confidence: 98%

Simulation Study on the Sediment Dispersion during Deep-Sea Nodule Harvesting

Lin

Weng

Guo

et al. 2022

JMSE

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During the harvesting of polymetallic nodules on the seabed, the sediment plume due to disturbance on the seabed impacts the benthic ecosystem. A numerical simulation based on the SPH (smooth particle hydrodynamics) method is used to estimate the time and length scale of the plume impact near the seabed during a small-scale harvesting process. The simulation result considerably agrees with the one from the lab-scale water-channel experiment. It is found that, in the sediment plume, the traced sub-plume with iso-surface of lower sediment concentration travels a longer distance, and spends a longer time to achieve the stable state. Moreover, with the increase of the releasing rate of the disturbed sediment, the sub-plume spreads over greater distance, which also needs more time to achieve the stable state.

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Section: Resultsmentioning

confidence: 98%

Simulation Study on the Sediment Dispersion during Deep-Sea Nodule Harvesting

Lin

Weng

Guo

et al. 2022

JMSE

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“…In a previous study, the model predicting the yield stress that evaluates the gel strength of clay dispersions was developed from DLVO theory [ 11 ]. The yield stress,

, of the gel system can be estimated using the following equation [ 39 ]:

where

is the effective radius of the suspending particles,

is the volume fraction of the clay particles in the system,

is the distance between clay particles, and

is the distance between clay particles at the yield point of the system.…”

Section: Resultsmentioning

confidence: 99%

“…In a previous study, the model predicting the yield stress that evaluates the gel strength of clay dispersions was developed from DLVO theory [11]. The yield stress, τ y , of the gel system can be estimated using the following equation [39]:…”

Section: Theoretical Modelmentioning

confidence: 99%

“…Substituting Equation (11) into Equation ( 9), the models describing YP as a function of the particle concentration, as well as the temperature, can be obtained.…”

Section: Theoretical Modelmentioning

confidence: 99%

“…With an applied stress above the yield stress, the system becomes liquid-like and shows a significant shear-thinning behavior, i.e., the viscosity decreases with an increasing shear rate applied to the system, which is due to the disaggregation and orientation of the structure from the micro- to the nano-scale [ 6 , 7 , 8 , 9 ]. The rheological behavior of the clay dispersions is sensitive to the change in the clay’s concentration, ionic strength, and temperature, as well as the pH of the system [ 4 , 10 , 11 , 12 ].…”

Section: Introductionmentioning

confidence: 99%

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Effect of Nanoparticles on Rheological Properties of Water-Based Drilling Fluid

et al. 2023

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Nano-water-based drilling fluids (NWBDFs) are prepared using nano-copper oxide (CuO) and multiwalled carbon nanotubes (MWCNTs) as modification materials. The effects of the temperature and concentration of the nanoparticles (NPs) on the rheological properties are studied using a rotational rheometer and viscometer. Also, the influence of two NPs on the filtration properties is studied using a low-pressure and low-temperature filtration apparatus, as well as a scanning electron microscope (SEM). It is found that MWCNTs with a concentration of 0.05 w/v% have the most obvious influence on the NWBDFs, which improve the stability of the gel structure against temperature and also decrease the filtration rate. Finally, a theoretical model predicating the yield point (YP) and the plastic viscosity (PV) as a function of the temperature considering the influence of the NPs is developed based on DLVO theory.

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