Dissipation behaviors of granular balls in a shaken closed container

Zhang, Kai; Zhong, Huajia; Chen, Tianning; Kou, Farong; Chen, Yan; Bai, Changan

doi:10.1016/j.ymssp.2022.108986

Cited by 23 publications

(2 citation statements)

References 49 publications

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“…30 for the details of this method. Granular system used in this work is the same one employed in our recent studies 3,31 , i.e., a quasi-2D closed container of internal dimensions L x ×L y ×L z = 60 mm×5 mm×120 mm which is partially lled with 279 spherical beads of diameter 4 mm. The density of the container and granular balls are set to 1190 kg/m 3 and 2500 kg/m 3 respectively.…”

Section: Modelingmentioning

confidence: 99%

Uncertainty of vibrated granular balls in dynamical behavior

Zhang

2023

Preprint

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There is a known granular motion pattern where a dense upper region is supported on a fluidized low-density region underneath, i.e., so-called density inversion which is regarded as a precursor to granular Leidenfrost effect1-2. In this work, we show another possible granular motion pattern by discrete element simulation, i.e., the granular wave-solid state3 which reflects the uncertainty of density inversion. The occurrence probability of density inversion or wave-solid state is presented by vibrating granular systems of random packing with constant excitation parameters. Moreover, our simulations further reproduce the well-known Butterfly effect that indicates the sensitivity of nonlinear systems to initial conditions. Based on the phenomena revealed by our simulations, we believe that density inversion which is highly influenced by initial packing state of granular balls is not the only path to granular Leidenfrost effect. In addition, we argue that the granular system that undergone one dynamic test is no longer the original one due to the change of granular packing state, which should not be ignored in the experimental studies of granular dynamics.

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Section: Modelingmentioning

confidence: 99%

Uncertainty of vibrated granular balls in dynamical behavior

Zhang

2023

Preprint

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“…Depending on the dominant motion type that governs particle movements, the operating motional phase is identified at a given loading condition for a granular medium (11). As it can change with the loading condition, granular motional phase maps, on which the identified motional phases are shown in an amplitude-frequency plane, are considered useful for granular damper design (7,12). However, the derivation of motional phase maps requires time-consuming visual observations of simulations and experiments of a particulate system.…”

Section: Introductionmentioning

confidence: 99%

Construction of motional phase maps for granular dampers

2023

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Harmonically vibrated granular media exhibit a variety of motional behaviours depending on amplitude, frequency, and vibration-to-gravity directional orientation. Motional behaviour defines the physical interactions of particles in the granular media and therefore the energy dissipation performance. A "phase map" that describes motional behaviour over broad ranges of frequency and amplitude is therefore a very useful tool in damper design. However, at present, identification of the operating motional conditions within the granular media has only been conducted by visual observation of the particles following a particle-level simulation or a specifically designed experiment. Because of this, design optimisation over a broad range of amplitude and frequency becomes costly. This paper aims to help reduce this cost through the development of approximate phase maps based on expected dissipative interactions of particles. Three-dimensional discrete element method simulations are conducted over a wide range of excitation intensities under two different vibration-to-gravity directional orientations (i.e., perpendicular, and parallel to the standard gravity direction) to allow the observation of as many motional phases as possible. The effect of particle size, volume filling ratio and particle shape on granular energy dissipation sources are also investigated.

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