1/<i>f</i>noise on the brink of wet granular melting

Huang, Keqing

doi:10.1088/1367-2630/17/8/083055

Cited by 11 publications

(9 citation statements)

References 49 publications

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“…Here, we focus on the case of a liquid film covering the solid bodies under impact, in order to shed light on the collective behavior of wet granular matter at a particle level. Recent investigations have revealed that clustering [24,25], phase transitions [26][27][28][29] as well as pattern formation [30,31] of wet granular matter are often related to the 'microscopic' particle-particle interactions, among which the wetting liquid plays an important role. Because the presence of a liquid film as thin as a few nanometers can be sufficient to influence the rigidity of granular matter substantially [32,33], it is essential to consider such an influence in the omnipresent applications.…”

Section: Introductionmentioning

confidence: 99%

Influence of the liquid film thickness on the coefficient of restitution for wet particles

Müller

Huang

2016

Phys. Rev. E

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The normal coefficient of restitution (COR) for a spherical particle bouncing on a wet plane is investigated experimentally and compared with a model characterizing the energy loss at impact. For fixed ratios of liquid film thickness δ to particle diameter D, the wet COR is always found to decay linearly with St −1 , where St, the Stokes number, measures the particle inertia with respect to the viscous force of the liquid. Such a dependency suggests a convenient way of predicting the wet COR with two fit parameters: A critical COR at infinitely large St and a critical St at zero COR. We characterize the dependency of the two parameters on δ/D and compare it with a model considering the energy loss from the inertia and the viscosity of the wetting liquid. This investigation suggests an analytical prediction of the COR for wet particles.

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Section: Introductionmentioning

confidence: 99%

Influence of the liquid film thickness on the coefficient of restitution for wet particles

Müller

Huang

2016

Phys. Rev. E

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“…Motivated by the fact that moisture is ubiquitous in nature and its influence on the collective behavior of granular matter is inevitable 42,43 , there has been a growing interest in partially wet granular matter [44][45][46] . Due to the cohesive interactions induced by liquid bridges formed between adjacent particles, the transitions between different stationary states in wet granular matter exhibit interesting features such as phase separation and surface melting in comparison to its dry counterpart [47][48][49][50][51][52][53][54] . For the same reason, an oscillated wet granular layer has a different pattern forming scenario: Instead of instabilities reminiscent of Faraday crispations 32,34,36 , period tripling induced rotating spirals and propagating kink-wave fronts were found to dominate in a wet granular liquid [55][56][57] .…”

Section: Introductionmentioning

confidence: 99%

Density-wave fronts on the brink of wet granular condensation

Zippelius

Huang

2017

Sci Rep

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Density-wave fronts in a vibrofluidized wet granular layer undergoing a gas-liquid-like transition are investigated experimentally. The threshold of the instability is governed by the amplitude of the vertical vibrations. Fronts, which are curved into a spiral shape, propagate coherently along the circular rim of the container with leading edges. They are stable beyond a critical distance from the container center. Based on an analysis of the emerging time and length scales, we propose a model for the pattern formation by considering the competition between the time scale for the condensation of wet granular particles from a gas-like state and that of the energy injection resisting this process.

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“…A class of models of 1/f noise relevant for driven nonequilibrium systems involves the self-organized criticality (SOC) [18][19][20][21]. SOC refers to the tendency of nonequilibrium systems driven by slow constant energy input to organize themselves into a correlated state where all scales are relevant [19].…”

Section: Introductionmentioning

confidence: 99%

1/fnoise from point process and time-subordinated Langevin equations

Ruseckas¹,

Kazakevičius²,

Kaulakys³

2016

J. Stat. Mech.

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Abstract. Internal mechanism leading to the emergence of the widely occurring 1/f noise still remains an open issue. In this paper we investigate the distinction between internal time of the system and the physical time as a source of 1/f noise. After demonstrating the appearance of 1/f noise in the earlier proposed point process model, we generalize it starting from a stochastic differential equation which describes a Brownian-like motion in the internal (operational) time. We consider this equation together with an additional equation relating the internal time to the external (physical) time. We show that the relation between the internal time and the physical time that depends on the intensity of the signal can lead to 1/f noise in a wide interval of frequencies. The present model can be useful for the explanation of the appearance of 1/f noise in different systems.

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1/fnoise on the brink of wet granular melting

Cited by 11 publications

References 49 publications

Influence of the liquid film thickness on the coefficient of restitution for wet particles

Influence of the liquid film thickness on the coefficient of restitution for wet particles

Density-wave fronts on the brink of wet granular condensation

1/fnoise from point process and time-subordinated Langevin equations

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