Particle Dynamics at the Onset of the Granular Gas-Liquid Transition

Noirhomme, Martial; Cazaubiel, Annette; Falcon, Éric; Fischer, David G.; Garrabos, Yves; Lecoutre-Chabot, Carole; Mawet, Sébastien; Opsomer, Eric; Palencia, Fabien; Pillitteri, Salvatore; Vandewalle, Nicolas

doi:10.1103/physrevlett.126.128002

Cited by 12 publications

(8 citation statements)

References 42 publications

(49 reference statements)

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“…1 Similarly, granular matter also exhibits a plethora of spontaneous symmetry-breaking instabilities. 9,10 Both granular hydrodynamics and direct molecular dynamics simulations [11][12][13] show that the coexistence of the granular phase close to the critical point is strikingly similar to the spinodal decomposition of molecular gas-liquid transition. However, both theoretical analyses and experiments for phase coexistence in dense fluidization, as a system far from the critical point, are few.…”

Section: Introductionmentioning

confidence: 93%

“…It provides a novel tool to understand abundant characteristics in granular media such as gas-solid bifurcation 9 and hysteresis. 10 From the comparison of the experiment and granular state equation in Figure 4B, although the solid volume fraction of the two phases (emulsion and bubbles) obtained from the experiment is not completely in accordance with the binodal line derived from the granular state equation, it is scattered in the section between binodal and spinodal line.…”

Section: Negative Compressibility In Granular Mediamentioning

confidence: 99%

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Phase coexistence in fluidization

Zhang

Wang

et al. 2021

AIChE Journal

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The coexistence and interaction of a granular liquid-like phase (emulsion) and a gas-like phase (bubbles) in fluidization is a spontaneous symmetry-breaking dissipative state, contributing to excellent mixing behavior in fluidized beds. In the present study, a universal granular state equation to describe the phase coexistence at far away from the critical point is developed by taking both the inelastic solid collision and asymmetrical instability into consideration. Besides, a cold-flow experiment using particles of the Geldart's A group at 0.1-1 MPa pressure is performed to verify the granular state equation, where the solid volume fraction (ε s ) and solid pressure (p s ) are obtained by a dual optical probe and a special pressure transducer, respectively. Based on both theoretical analysis and experimental study, a phase diagram is produced to serve as a useful guide for the design and operation of efficient fluidized-bed reactors.

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Section: Introductionmentioning

confidence: 93%

Section: Negative Compressibility In Granular Mediamentioning

confidence: 99%

Phase coexistence in fluidization

Zhang

Wang

et al. 2021

AIChE Journal

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“…Physics of matter: Research on board parabolic flights tries to investigate the structure of matter and its modification at macroscopic or microscopic scales. Physics of fluid [3][4][5][6], physics of granular media [7], test of principle of equivalence and atomic clocks [8], combustion [9,10]. .…”

Section: Why Do Research In Microgravity?mentioning

confidence: 99%

30 years of CNES parabolic flights for the benefit of the scientific community

Rouquette¹

2023

Comptes Rendus. Mécanique

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Parabolic flights allow short microgravity investigations in Physical and Life Sciences, technology and instrumentation tests. The use of parabolic flights is complementary to other microgravity carriers, and preparatory to manned space missions onboard the International Space Station and other manned spacecraft, around the Earth or beyond, to the Moon for example.The main advantages of parabolic flights for microgravity investigations are the short turn-around time, the relatively low cost, the flexibility of experimental approach, the possibility of direct intervention by investigators on board the aircraft during and between parabolas, and the possibility of modifying the experiment set-up between flights.

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“…In molecular systems, phase transitions result from the competition between thermal agitation and the interaction between the particles. In granular systems, the macroscopic counterpart to phase transitions [1,3,4] can be obtained by varying the number of particles [5][6][7], inducing interactions between particles [8,9] or tuning the confinement [10]. In particular, thin and vibrated layers of grains [2,[11][12][13][14][15] are of fundamental interest because they allow using particle tracking techniques, yielding the dynamics of each grain individually and over durations far exceeding those accessible through molecular dynamics simulations.…”

Section: Introductionmentioning

confidence: 99%

Wave spectroscopy in a driven granular material

et al. 2022

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Driven granular media constitute model systems in out-of-equilibrium statistical physics. By assimilating the motions of granular particles to those of atoms, by analogy, one can obtain macroscopic equivalent of phase transitions. Here, we study fluid-like and crystal-like two-dimensional states in a driven granular material. In our experimental device, a tunable magnetic field induces and controls remote interactions between the granular particles. We use high-speed video recordings to analyse the velocity fluctuations of individual particles in stationary regime. Using statistical averaging, we find that the particles self-organize into collective excitations characterized by dispersion relations in the frequency-wavenumber space. These findings thus reveal that mechanical waves analogous to condensed matter phonons propagate in driven granular media. When the magnetic coupling is weak, the waves are longitudinal, as expected for a fluid-like phase. When the coupling is stronger, both longitudinal and transverse waves propagate, which is typically seen in solid-like phases. We model the dispersion relations using the spatial distribution of particles and their interaction potential. Finally, we infer the elastic parameters of the granular assembly from equivalent sound velocities, thus realizing the spectroscopy of a granular material.

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Particle Dynamics at the Onset of the Granular Gas-Liquid Transition

Cited by 12 publications

References 42 publications

Phase coexistence in fluidization

Phase coexistence in fluidization

30 years of CNES parabolic flights for the benefit of the scientific community

Wave spectroscopy in a driven granular material

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