Granular wave-solid state: an accident of density inversion?

Zhang, Kai; Kou, Farong; Sun, Fugui; Zhong, Huajia; Chen, Meng

doi:10.1007/s10035-022-01266-y

Cited by 5 publications

(2 citation statements)

References 14 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%

“…A comprehensively experimental work was carried out on a shallow, vertically vibrated granular bed by Eshuis et al 22 , providing the complete phase diagram of various patterns consisting of solid bed, bouncing bed, sub-harmonic undulations, Leidenfrost effect, convection and granular gas. For a review on the dynamical behaviors of vibrated granular materials as well as to know the speci c contributions of various research groups, we refer the readers to the review articles 3,4 and recent reports [23][24] .…”

Section: Introductionmentioning

confidence: 99%

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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%