Comparison of different capillary bridge models for application in the discrete element method

Gladky, Anton; Schwarze, Rüdiger

doi:10.1007/s10035-014-0527-z

Cited by 46 publications

(35 citation statements)

References 29 publications

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“…We assume the surface of particles to be homogeneous without defects, thereby neglecting the effect of pinning and only slipping occurs. [13] compares the macroscopic results for different liquid capillary bridge models and shows that they are in agreement, except the model of [32]. The rupture distance is proportional to V 1/3 b as stated in Eq.…”

Section: Liquid Bridge Capillary Force Modelsupporting

confidence: 52%

“…Earlier studies on wet granular materials have shown that the presence of liquid bridges between the particles results in an increasing steady-state cohesion of the materials [12,13,15,27]. Our earlier studies show that the steady-state cohesion c * increases non-linearly with increasing liquid bridge volume.…”

Section: Steady-state Cohesion and Its Correlation With Liquid Bridgementioning

confidence: 95%

“…When the particles are in contact, the attractive force is given by Eq. (13). This is independent of the liquid bridge volume and depends on the surface tension of the liquid, radius of particles, and contact angle.…”

Section: Liquid Bridge Contact Modelmentioning

confidence: 99%

“…The tensile forces generated at particle level result in cohesion at macroscopic scale. Earlier studies have been done for liquid bridge in the pendular regime to understand the effect of liquid bridge volume and contact angle on different macroscopic quantities like the steady-state cohesion, torque, and shear band properties [12][13][14][15][16]. Other studies for unsaturated granular media observe fluid depletion in shear bands [17,18].…”

Section: Introductionmentioning

confidence: 99%

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Micro–macro transition and simplified contact models for wet granular materials

et al. 2015

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Wet granular materials in a quasistatic steadystate shear flow have been studied with discrete particle simulations. Macroscopic quantities, consistent with the conservation laws of continuum theory, are obtained by time averaging and spatial coarse graining. Initial studies involve understanding the effect of liquid content and liquid properties like the surface tension on the macroscopic quantities. Two parameters of the liquid bridge contact model have been identified as the constitutive parameters that influence the macroscopic rheology (i) the rupture distance of the liquid bridge model, which is proportional to the liquid content, and (ii) the maximum adhesive force, as controlled by the surface tension of the liquid. Subsequently, a correlation is developed between these microparameters and the steady-state cohesion in the limit of zero confining pressure. Furthermore, as second result, the macroscopic torque measured at the walls, which is an experimentally accessible parameter, is predicted from our simulation results with the same dependence on the microparameters. Finally, the steady-state cohesion of a realistic non-linear liquid bridge contact model scales well with the steady-state cohesion for a simpler linearized irreversible contact model with the same maximum adhesive force and equal energy dissipated per contact. B Sudeshna Roy

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Section: Liquid Bridge Capillary Force Modelsupporting

confidence: 52%

Section: Steady-state Cohesion and Its Correlation With Liquid Bridgementioning

confidence: 95%

Section: Liquid Bridge Contact Modelmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Micro–macro transition and simplified contact models for wet granular materials

et al. 2015

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“…For smallest amounts of water used in experiments, it may be assumed that the water is distributed as binary liquid bridges between particles [11,12]. For the simulations, we also assume that the capillary forces act only at the contact points between particles and the contact angle is zero.…”

Section: Discrete Element Simulationsmentioning

confidence: 99%

Cohesive strength of iron ore granules

Contreras¹,

Berger

Izard

et al. 2017

EPJ Web Conf.

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Abstract. We present an experimental and numerical investigation of the mechanical strength of crude iron ore (Hematite) granules in which capillary bonds between primary particles are the source of internal cohesion. The strength is measured by subjecting the granules to vertical compression between two plates. We show that the behavior of the granules is ductile with a welldefined plastic threshold which increases with the amount of water. It is found that the compressive strength scales with capillary cohesion with a pre-factor that is nearly independent of size polydispersity for the investigated range of parameters but increases with friction coefficient between primary particles. This weak dependence may be attributed to the class of fine particles which, due to their large number, behaves as a cohesive matrix that controls the strength of the granule.

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Development of a Dynamic-Physical Process Model for Sieving

Markauskas

Kruggel‐Emden

2020

Dynamic Flowsheet Simulation of Solids Processes

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Comparison of different capillary bridge models for application in the discrete element method

Cited by 46 publications

References 29 publications

Micro–macro transition and simplified contact models for wet granular materials

Micro–macro transition and simplified contact models for wet granular materials

Cohesive strength of iron ore granules

Development of a Dynamic-Physical Process Model for Sieving

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