Granular packing as model glass formers

Wang, Yujie

doi:10.1088/1674-1056/26/1/014503

Cited by 9 publications

(7 citation statements)

References 116 publications

(216 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…From a homogeneous excited-state, the system enters into an initial period of homogeneous energy loss, and later grains can spontaneously cluster. [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17] Theoretical modeling, [18][19][20][21][22][23][24][25][26][27][28][29] and simulation investigations [20][21][22]24,28,[30][31][32][33][34][35][36][37][38][39] are based on simplifications and assumptions of grain properties. Quantitative experiments are very much needed for better understanding of fundamental features of such ensembles.…”

Section: Introductionmentioning

confidence: 99%

Experimental and numerical study on energy dissipation in freely cooling granular gases under microgravity

et al. 2018

View full text Add to dashboard Cite

Energy dissipation is one of the most important properties of granular gas, which makes its behavior different from that of molecular gas. In this work we report our investigations on the freely-cooling evolution of granular gas under microgravity in a drop tower experiment, and also conduct the molecular dynamics (MD) simulation for comparison. While our experimental and simulation results support Haff's law that the kinetic energy dissipates with time t as E(t) ∼ (1 + t/τ) −2 , we modify τ by taking into account the friction dissipation during collisions, and study the effects of number density and particle size on the collision frequency. From the standard deviation of the measured velocity distributions we also verify the energy dissipation law, which is in agreement with Haff's kinetic energy dissipation.

show abstract

Section: Introductionmentioning

confidence: 99%

Experimental and numerical study on energy dissipation in freely cooling granular gases under microgravity

et al. 2018

View full text Add to dashboard Cite

show abstract

“…For further estimations, [14][15][16][17] we can take the coordinate number Z = 2 √ 3φ / (1−φ ) and its value at the random loose pack Z lp = 4 = 2 √ 3φ lp / 1−φ lp . Parameters for glass are as follows: ρ glass = 2600 kg/m 3 , ν g = 0.2, and µ g = 10 GPa.…”

Section: Theorymentioning

confidence: 99%

Ultrasound wave propagation in glass-bead packing under isotropic compression and uniaxial shear

2017

View full text Add to dashboard Cite

The axial-stress dependence of sound wave velocity in granular packing is experimentally investigated with tri-axial and uni-axial devices. Preparing samples by repetitive loadings and unloadings in a range of 20 kPa-1000 kPa, we find that the axial-stress dependence of sound wave velocity approaches the Hertz scaling with an exponent of 1/6 for large axial stresses (> 400 kPa). Weak deviation from the Hertz scaling is seen at low stresses. Repetitive axial loadings slightly reduce this deviation, and sound velocities increase nonlinearly approaching some saturated values. Velocities for uni-axial case are found slightly to be bigger than those for tri-axial isotropic compression case. These effects are discussed in the frameworks of granular solid hydrodynamics (GSH) and effective medium theory (EMT), which indicate that they cannot be explained with density nor Janssen ratio only. Dissipation occurring during wave propagation may be a non-negligible factor.

show abstract

“…Dynamical heterogeneity is considered to be one of the key features of structural relaxation in supercooled liquids and glasses. [1][2][3] As the temperature of a glass-forming liquid is rapidly lowered, the motion of particles within the liquid becomes spatially and temporally heterogeneous. [2,[4][5][6] While the overall motions within the liquid slow down, particles in some regions exhibit faster dynamics than the rest, and over time these mobile regions can appear and disappear throughout the system.…”

Section: Introductionmentioning

confidence: 99%

Nonperturbative effects of attraction on dynamical behaviors of glass-forming liquids*

Sun¹,

Zhang²,

Wang³

et al. 2020

Chinese Phys. B

View full text Add to dashboard Cite

We investigate systematically the effects of the inter-particle attraction on the structure and dynamical behaviors of glass-forming liquids via molecular dynamics simulations. We find that the inter-particle attraction does not influence the structure, but greatly affects the dynamics and dynamical heterogeneity of the system. After the system changes from a purely repulsive glass-forming liquid to an attractive one, the dynamics slows down and the dynamical heterogeneity becomes greater, which is found interestingly to be associated with larger cooperative rearrangement regions (CRRs). Additionally, the structures of CRRs are observed to be compact in attractive glass-forming liquids but string-like in purely repulsive ones. Our findings constitute an important contribution to the ongoing study of the role of attractions in properties of glasses and glass-forming liquids.

show abstract

Granular packing as model glass formers

Cited by 9 publications

References 116 publications

Experimental and numerical study on energy dissipation in freely cooling granular gases under microgravity

Experimental and numerical study on energy dissipation in freely cooling granular gases under microgravity

Ultrasound wave propagation in glass-bead packing under isotropic compression and uniaxial shear

Nonperturbative effects of attraction on dynamical behaviors of glass-forming liquids*

Contact Info

Product

Resources

About