Capillary forces on wet particles with a liquid bridge transition from convex to concave

Xiao, Fei; Jing, Jiaqiang; Kuang, Shibo; Yang, Lü; Yu, Aibing

doi:10.1016/j.powtec.2020.01.020

Cited by 38 publications

(15 citation statements)

References 69 publications

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“…Interestingly, with a large enough liquid volume, the solution that minimizes the surface energy is not anymore axisymmetric 21 , as it was also shown numerically and experimentally 19 . Moreover, when increasing the separation distance, it is possible to observe a transition from a convex to a concave profile 20 .…”

Section: Introductionmentioning

confidence: 99%

Capillary‐bridge forces between solid particles: Insights from lattice Boltzmann simulations

2021

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Liquid capillary-bridge formation between solid particles has a critical influence on the rheological properties of granular materials and, in particular, on the efficiency of fluidized bed reactors. The available analytical and semi-analytical methods have inherent limitations, and often do not cover important aspects, like the presence of non-axisymmetric bridges. Here, we conduct numerical simulations of the capillary bridge formation between equally and unequally-sized solid particles using the lattice Boltzmann method, and provide an assessment of the accuracy of different families of analytical models. We find that some of the models taken into account are shown to perform better than others. However, all of them fail to predict the capillary force for contact angles larger than π/2, where a repulsive capillary force attempts to push the solid particle outwards to minimize the surface energy, especially at a small separation distance. We then apply the most suitable model to study the impact of capillary interactions on particle clustering using a coupled lattice Boltzmann and Discrete Element method. 1This article has been accepted for publication and undergone full peer review but has not been through the copyediting, typesetting, pagination and proofreading process which may lead to differences between this version and the Version of Record. Please cite this article as

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Section: Introductionmentioning

confidence: 99%

Capillary‐bridge forces between solid particles: Insights from lattice Boltzmann simulations

2021

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“…However, the fluctuations show that the axisymmetric ellipsoidal shape of the formed droplet is permanently changing. Thus, the axes of the elliptical meridional cross-section of the jet are changed alternately under the action of capillary forces [19,20]. The amplitude of these oscillations gradually decreases, and the jet surface loses stability due to the unstable waves [21], surface tension-induced global instability [22], occurance of the Rayleigh-Plateau unstable modes [23], free-surface shear layer instabilities [24], and gas velocity oscillations [25], which ultimately leads to the decay of the liquid jet into droplets.…”

Section: Introductionmentioning

confidence: 99%

Effect of Superimposed Vibrations on Droplet Oscillation Modes in Prilling Process

et al. 2020

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This article was aimed to solve an urgent problem of ensuring quality for prilling processes in vibrational prilling equipment. During the research, the need for the application of vibrational prilling to create a controlled impact on the process of jet decay on droplets with the proper characteristics was substantiated. Based on the experimental and theoretical studies of the process of decay of a liquid jet into drops, axisymmetric droplet oscillation modes for the different frequencies were observed. Frequency ranges of transition between modes of decay of a jet into drops were obtained. As a result, the mathematical model of the droplet deformation was refined. The experimental research data substantiated this model, and its implementation allowed determining the analytical dependencies for the components of the droplet deformation velocity. The proposed model explains the existence of different droplet oscillation modes depending on the frequency characteristics of the superimposed vibrational impact. Based on an analytical study of the droplet deformation velocity components, the limit values of the characteristics defining the transition between the different droplet oscillation modes were discovered. Analytical dependencies were also obtained to determine the diameter of the satellites and their total number.

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“…During stretching, the bridge becomes longer and thinner, and the capillary force generally decreases. This interplay between the contact angle, relative bridge volume, and particle separation has been studied by many researchers [12][13][14][15][16] where multiple approaches are possible to calculate the bridge force. The Young-Laplace equation can be integrated from its differential form to obtain the bridge profile.…”

Section: Capillary Force and Influence Of Bridge Shapementioning

confidence: 99%

“…These convex bridges with contact angles below 90°, which exist for high relative volume or low interparticle separation, can transition to a concave shape upon stretching. Using the models of Alguacial and Gauckler and by solving the Laplace-Young equation, Xiao et al created a model for the capillary force and rupture distance that can take the convex-concave transition into account [15]. This transition can be seen in Figure 3 as the change from convex unduloid to cylindrical bridge and finally to a concave unduloid with increasing interparticle separation.…”

Section: Capillary Force and Influence Of Bridge Shapementioning

confidence: 99%

The behavior of capillary suspensions at diverse length scales: From single capillary bridges to bulk

Bindgen¹,

Allard²,

Koos

2022

Current Opinion in Colloid & Interface Science

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Liquid-liquid-solid systems are becoming increasingly common in everyday life with many possible applications. Here, we focus on a special case of such liquid-liquid-solid systems, namely, capillary suspensions. These capillary suspensions originate from particles that form a network based on capillary forces and are typically composed of solids in a bulk liquid with an added secondary liquid. The structure of particle networks based on capillary bridges possesses unique properties compared with networks formed via other attractive interactions where these differences are inherently related to the properties of the capillary bridges, such as bridge breaking and coalescence between adjacent bridges. Thus, to tailor the mechanical properties of capillary suspensions to specific requirements, it is important to understand the influences on different length scales ranging from the dynamics of the bridges with varying external stimuli to the often heterogeneous network structure.

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Capillary forces on wet particles with a liquid bridge transition from convex to concave

Cited by 38 publications

References 69 publications

Capillary‐bridge forces between solid particles: Insights from lattice Boltzmann simulations

Capillary‐bridge forces between solid particles: Insights from lattice Boltzmann simulations

Effect of Superimposed Vibrations on Droplet Oscillation Modes in Prilling Process

The behavior of capillary suspensions at diverse length scales: From single capillary bridges to bulk

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