Effect of liquid volume fraction and shear rate on rheological properties and microstructure formation in ternary particle/oil/water dispersion systems under shear flow: two-dimensional direct numerical simulation

Ishigami, Toru; Karasudani, Taisei; Onitake, Shu; Shirzadi, Mohammadreza; Fukasawa, Tomonori; Fukui, Kiichi; Mino, Yasushi

doi:10.1039/d2sm00373b

Cited by 6 publications

(2 citation statements)

References 54 publications

(90 reference statements)

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“…On one hand, shear can induce the formation or re-aggregation of floc network structure and then the particle sizes increase, which leads to the increase of rheological properties of suspensions (Fan et al, 2020;Wu et al, 2022). On the other hand, shear can also disrupt the floc network structure when it exceeds the shear resistance of the structure and then the rheological properties will decrease (Farrokhpay, 2012;Ishigami et al, 2022). In order to study the effect of shear on flocculating suspensions, it is important to select reasonable shear parameters (Clark, 2016;Zhang et al, 2022).…”

Section: Introductionmentioning

confidence: 99%

Effect of shear ratio on rheological properties of suspension in two-step flocculation process for fine iron tailings

Yang

Wang³

et al. 2023

Front. Mater.

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In the two-step flocculation process, shear has a significant impact on the rheological properties of the flocculating slurry. In this study, the orthogonal experiments of two-step flocculation process for fine iron tailings were designed. Based on the change of shear ratio, different shear rates and shear time were designed, the yield stress, plastic viscosity and maximum packing fraction of the flocculated suspension in each group were measured and calculated with a rheometer. The result of range and variance analysis shows the shear rate in the primary broken phase was the biggest factor affecting the yield stress and plastic viscosity of the flocculated slurry in two-step flocculation process. When the shear rate increased from 100 s-1 to 400 s-1, the yield stress and the plastic viscosity of the flocculated slurry increased by 7.14% and 21.30%, respectively. When the shear rate changed from 400 s-1 to 800 s-1, they decreased by 23.27% and 33.17%, respectively. Since the shear ratio in a two-step flocculation process is also related to both shear action and floc structure parameter, the shear ratio was introduced into the first-order reversible kinetic rate equation. Through establishing the relationship between the shear ratio and the floc structural parameter of flocculating suspension, a theoretical model of the shear-dependent maximum packing fraction was established. The measured values and theoretical calculated values of the maximum packing fraction in two-step flocculation experiments were in good agreement and the error was within 5%. Last but not least, the internal mechanism of the theoretical model was discussed from the microscopic point of view.

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Section: Introductionmentioning

confidence: 99%

Effect of shear ratio on rheological properties of suspension in two-step flocculation process for fine iron tailings

Yang

Wang³

et al. 2023

Front. Mater.

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“…Studies on bubble motion include MB formation in microchannels by the volume of fluid (VOF) method, 35 mass transfer in bubble dissolution, 36 bubble motion under gravity by the lattice Boltzmann method (LBM), 37 Taylor bubble flow in the presence of surfactants by the level-set method, 38 Rayleigh bubble growth on the wall surface by the shock-interface capturing method, 39 MB cavitation by the boundary element method, 40 and rising motion of bubbles in viscous liquid 41 and viscoelastic fluid 42 by the coupled levelset and volume of fluid (CLSVOF) method. Studies on oil droplet motion include reports on the coalescence of droplets by VOF, 43 CLSVOF, 44,45 LBM, 46 and the phase-field model (PFM) [47][48][49][50][51] ; and structure formation between solid particles, water phase, and oil phase by LBM, 52 PFM, 53 and dissipative particle dynamics. 54 In recent years, simulations of three-phase flow with bubbles and water and oil phases have also been conducted.…”

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confidence: 99%

Numerical investigation of oil droplet detachment from wall surface by a microbubble using ternary phase‐field model

Yuhara,

Shirzadi,

Fukasawa

et al. 2023

AIChE Journal

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In this study, we investigated the detachment of an oil droplet from a wall surface by microbubbles (MBs) using the numerical simulation of a gas–liquid–liquid three‐phase flow based on a phase‐field model. A single MB was collided with an oil droplet adhered to a wall surface to determine whether the droplet would detach from the wall. It was confirmed that the oil droplet detached from the wall when the interfacial tension between the water and oil or between the bubble and oil was low. To clarify the mechanism, we theoretically calculated the balance of interfacial tension at the three‐fluid contact line. The lower the interfacial tension between the water and oil and between the bubble and oil, the smaller the contact angle of the oil droplet on the bubble. This increased wettability was the driving force that caused the oil droplet to detach from the wall surface.

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Development of edible nanoemulsions containing vitamin E using a low-energy method: Evaluation of particle size and physicochemical properties for food and beverage applications

Mohamadyan,

Yousefi,

Weisany

2024

Heliyon

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Effect of liquid volume fraction and shear rate on rheological properties and microstructure formation in ternary particle/oil/water dispersion systems under shear flow: two-dimensional direct numerical simulation

Abstract: We numerically studied the rheological properties and microstructure formation under shear flow in a ternary particle/oil/water dispersion system. Our numerical simulation method was based on a phase-field model for capturing...

Cited by 6 publications

References 54 publications

Effect of shear ratio on rheological properties of suspension in two-step flocculation process for fine iron tailings

Effect of shear ratio on rheological properties of suspension in two-step flocculation process for fine iron tailings

Numerical investigation of oil droplet detachment from wall surface by a microbubble using ternary phase‐field model

Development of edible nanoemulsions containing vitamin E using a low-energy method: Evaluation of particle size and physicochemical properties for food and beverage applications

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