Segregation effects on flow’s mobility and final morphology of axisymmetric granular collapses

Martínez, Francisco J.; Tamburrino, Aldo; Casis, Valentina; Ferrer‐Gallego, P. Pablo

doi:10.1007/s10035-022-01273-z

Cited by 4 publications

(5 citation statements)

References 34 publications

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“…This effect is enhanced when the size ratio between big and small grains increases, and when the column is immersed (He, Shi & Yu 2021). The mobility of columns is also affected by the heterogeneity of grain layers of different sizes, leading to an increase in the runout distance of initially segregated columns (Degaetano, Lacaze & Phillips 2013;Martinez et al 2022). For polydisperse systems, numerical studies have indicated that mobility increases with polydispersity (Watanabe, Moriguchi & Terada 2022) and have suggested that small grains enhance mobility because they lubricate the system (Lai et al 2017).…”

Section: Introductionmentioning

confidence: 99%

Polydispersity effect on dry and immersed granular collapses: an experimental study

Polanía,

Estrada,

Azéma

et al. 2024

J. Fluid Mech.

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The column collapse experiment is a simplified version of natural and industrial granular flows. In this set-up, a column built with grains collapses and spreads over a horizontal plane. Granular flows are often studied with a monodisperse distribution; however, this is not the case in natural granular flows where a variety of grain sizes, known as polydispersity, is a common feature. In this work, we study the effect of polydispersity, and of the inherent changes that polydispersity causes in the initial packing fraction, in dry and immersed columns. We show that dry columns are not significantly affected by polydispersity, reaching similar distances at similar times. In contrast, immersed columns are strongly affected by the polydispersity and packing fraction, and the collapse sequence is linked to changes of the basal pore fluid pressure $P$ . At the collapse initiation, negative changes of $P$ beneath the column produce a temporary increase of the column strength. The negative change of $P$ lasts longer in polydisperse columns than in monodisperse columns, delaying the collapse sequence. Conversely, during the column spreading, positive changes of $P$ lead to a decrease of the shear strength. For polydisperse collapses, the excess of $P$ lasts longer, allowing the material to reach farther distances, compared with the collapses of monodisperse materials. Finally, we show that a mobility model that scales the final runout with the collapse kinetic energy remains true for different polydispersity levels in a three-dimensional configuration, capturing the scaling between the micro to macro controlling features.

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Section: Introductionmentioning

confidence: 99%

Polydispersity effect on dry and immersed granular collapses: an experimental study

Polanía,

Estrada,

Azéma

et al. 2024

J. Fluid Mech.

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“…Staron & Hinch (2005 further investigated two-dimensional granular column collapses with the DEM, and found that the interparticle frictional coefficient played an important role in the run-out distance, but did not quantify such frictional effects. Previous research also studied the complexity of granular column collapses when the system was subjected to different realistic conditions, such as particle size polydispersity (Cabrera & Estrada 2019;Martinez et al 2022), fluid saturation or immersion (Rondon, Pouliquen & Aussillous 2011;Fern & Soga 2017;Bougouin, Lacaze & Bonometti 2019), complex particle shapes and erodible boundaries (Wu, Wang & Li 2021). However, no matter how complex the granular system was, the interparticle friction was often set constant and unique.…”

Section: Introductionmentioning

confidence: 99%

“…Previous research also studied the complexity of granular column collapses when the system was subjected to different realistic conditions, such as particle size polydispersity (Cabrera & Estrada 2019; Martinez et al. 2022), fluid saturation or immersion (Rondon, Pouliquen & Aussillous 2011; Fern & Soga 2017; Bougouin, Lacaze & Bonometti 2019), complex particle shapes (Zhang et al. 2018) and erodible boundaries (Wu, Wang & Li 2021).…”

Section: Introductionmentioning

confidence: 99%

Axisymmetric column collapses of bi-frictional granular mixtures

et al. 2023

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The behaviour of granular column collapses is associated with the dynamics of geohazards, such as debris flows, landslides and pyroclastic flows, yet their underlying physics is still not well understood. In this paper, we explore granular column collapses using the sphero-polyhedral discrete element method, where the system contains two types of particles with different frictional properties. We impose three different mixing ratios and multiple different particle frictional coefficients, which lead to different run-out distances and deposition heights. Based on our previous work and a simple mixture theory, we propose a new effective initial aspect ratio for the bi-frictional granular mixture, which helps unify the description of the relative run-out distances. We analyse the kinematics of bi-frictional granular column collapses and find that deviations from classical power-law scaling in both the dimensionless terminal time and the dimensionless time when the system reaches the maximum kinetic energy may result from differences in the initial solid fraction and initial structures. To clarify the influence of initial states, we further decrease the initial solid fraction of granular column collapses, and propose a trial function to quantitatively describe its influence. Due to the utilization of a simple mixture theory of contact occurrence probability, this study can be associated with the friction-dependent rheology of granular systems and friction-induced granular segregations, and further generalized to applications with multiple species of particles in various natural and engineering mixtures.

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“…They found out that the mixing ratio and the contact occurrence probability play a crucial role in determining the run-out distance. Martinez et al [91] investigated the effects of size segregation on the flow dynamics of the collapse. They found out that the granular column containing polydisperse granular material usually achieves a larger run-out distance.…”

Section: Introductionmentioning

confidence: 99%

“…Similar findings were also presented by Linares et al [92] in the context of granular avalanches a decade ago. Moreover, Martinez et al [91] also suggested that basal friction and particle friction are not the only controlling parameters for the granular collapse but also the interplay of different layers of granular columns containing particles of different sizes is a key factor to understand the dynamics of the avalanches. Recently, Huet et al [93] investigated the collapse behavior of non-convex particles using experiments and simulations with the Discrete Element Method (DEM).…”

Section: Introductionmentioning

confidence: 99%

Dynamical behaviour of non-spherical grains in granular rapid flows

Hanif

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Bio 1.1. INTRODUCTION 19 1.2. EXPERIMENTAL SETUP 21 1.2. EXPERIMENTAL SETUP 23 4 1.3. ANALYSIS AND RESULTS 25 1.3. ANALYSIS AND RESULTS 27 1.3. ANALYSIS AND RESULTS 29 1.3. ANALYSIS AND RESULTS 31 1.3. ANALYSIS AND RESULTS 1.3. ANALYSIS AND RESULTS 35 1.3. ANALYSIS AND RESULTS 39 1.3. ANALYSIS AND RESULTS 41 42 CHAPTER 1. FLOW DYNAMICS OF QUASI-2D SILO 1.3. ANALYSIS AND RESULTS 43 1.4. CONCLUSION 45Gaussian fluctuations seem to be related to the collective movement of the particles through the orifice.

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Segregation effects on flow’s mobility and final morphology of axisymmetric granular collapses

Cited by 4 publications

References 34 publications

Polydispersity effect on dry and immersed granular collapses: an experimental study

Polydispersity effect on dry and immersed granular collapses: an experimental study

Axisymmetric column collapses of bi-frictional granular mixtures

Dynamical behaviour of non-spherical grains in granular rapid flows

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