Velocity Distribution of a Homogeneously Driven Two-Dimensional Granular Gas

Scholz, Christian; Pöschel, Thorsten

doi:10.1103/physrevlett.118.198003

Cited by 79 publications

(63 citation statements)

References 48 publications

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“…For ε ≥ 10, the magnetic repulsion constrains the horizontal motions perpendicular to the applied magnetic field, to favor the vertical motions and thus decreases the effective injected power. Finally, as reported for other quasi-two-dimensional vibrated granular gas experiments [11,20,21,[32][33][34][35], the distribution of particle velocities v for ε = 0 deviates from the Gaussian distribution expected for a molecular gas in equilibrium ( Fig. 2 (g)).…”

Section: Transition Towards a Collisionless Granular Gassupporting

confidence: 75%

Tuning the distance to equipartition by controlling the collision rate in a driven granular gas experiment

et al. 2020

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In a granular gas experiment of magnetized particles confined in a thin layer, the rate of dissipative collisions is tuned by adjusting the amplitude of an external magnetic field. The velocity statistics are analyzed using the dynamic and static structure factors of transverse velocity modes. Using the fluctuating hydrodynamics theory we measure the deviation from kinetic energy equipartition in this out-of-equilibrium system as a function of the dissipative collision rate. When the collision rate is decreased, the distance to equipartition becomes smaller meaning that the dynamical properties of this granular gas approach by analogy those of a molecular gas in thermal equilibrium.

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Section: Transition Towards a Collisionless Granular Gassupporting

confidence: 75%

Tuning the distance to equipartition by controlling the collision rate in a driven granular gas experiment

et al. 2020

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“…Following our recent work [32], unbounded fluidization [9] is simulated in a fully periodic domain with a square cross-section ( Fig. 1) via coupled computational fluid dynamics and discrete element method (CFD-DEM).…”

mentioning

confidence: 99%

“…The opensource solver MFiX [51] is used to perform the simulations. Details on the numerical method are available elsewhere [32]. In the simulations, the incompressible gas has density ρ g = 0.97 kg/m 3 and viscosity µ g = 1.8335×10 −5 Pa·s.…”

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confidence: 99%

Cluster-Induced Deagglomeration in Dilute Gravity-Driven Gas-Solid Flows of Cohesive Grains

Liu

Hrenya

2018

Phys. Rev. Lett.

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Clustering is often presumed to lead to enhanced agglomeration between cohesive grains due to the reduced relative velocities of particles within a cluster. Our discrete-particle simulations on gravity-driven, gas-solid flows of cohesive grains exhibit the opposite trend, revealing a new mechanism we coin "cluster-induced deagglomeration." Specifically, we examine relatively dilute gas-solid flows, and isolate agglomerates of cohesive origin from overall heterogeneities in the system i.e., agglomerates of cohesive origin and clusters of hydrodynamic origin. We observe enhanced clustering with an increasing system size (as is the norm for noncohesive systems) as well as reduced agglomeration. The reduced agglomeration is traced to the increased collisional impact velocities of particles at the surface of a cluster i.e., higher levels of clustering lead to larger relative velocities between the clustered and nonclustered regions, thereby serving as an additional source of granular temperature. This physical picture is further evidenced by a theoretical model based on a balance between the generation and breakage rates of agglomerates. Finally, cluster-induced deagglomeration also provides an explanation for a surprising saturation of agglomeration levels in gravity-driven, gas-solid systems with increasing levels of cohesion, as opposed to the monotonically increasing behavior seen in free-evolving or driven granular systems in the absence of gravity. Namely, higher cohesion leads to more energy dissipation, which is associated with competing effects: enhanced agglomeration and enhanced clustering, the latter of which results in more cluster-induced deagglomeration.arXiv:1804.08074v2 [cond-mat.soft]

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“…Furthermore, collisions between grains are dissipative so that external energy has to be injected permanently (often through vibrations) into the system in order to maintain a stationary gas like regime. Depending on the filling properties and driving mechanism of the system, granular gases exhibit intriguing phenomena such as anomalous scaling of pressure and non Gaussian velocity distribution (Rouyer and Menon 2000;Losert et al 1999;Tatsumi et al 2009;Falcon et al 2013;Scholz and Pöschel 2017). If one stops the external energy supply, the average energy in the system decays which is known as the cooling of a granular gas.…”

Section: Segregationmentioning

confidence: 99%