Self-diffusion in unbounded rapid granular flows: a nonequilibrium approach

2000 ◽  
Vol 275 (3-4) ◽  
pp. 347-360 ◽  
Author(s):  
Payman Jalali ◽  
William Polashenski Jr ◽  
Piroz Zamankhan ◽  
Pertti Sarkomaa
Keyword(s):  
Granular Flows ◽  
Self Diffusion

scholarly journals Self-diffusion scalings in dense granular flows

Soft Matter ◽  
2021 ◽  
Author(s):  
Riccardo Artoni ◽  
Michele Larcher ◽  
James T. Jenkins ◽  
Patrick Richard
Keyword(s):  
Shear Rate ◽  
Solid Fraction ◽  
Granular Flows ◽  
The Self ◽  
Granular Temperature ◽  
Restitution Coefficient ◽  
Self Diffusion ◽  
Diffusivity Tensor ◽  
Dense Granular Flows

The self-diffusivity tensor in homogeneously sheared dense granular flows is anisotropic. We show how its components depend on solid fraction, restitution coefficient, shear rate, and granular temperature.

scholarly journals Shear-induced diffusion: the role of granular clusters

2021 ◽  
Vol 249 ◽  
pp. 03035
Author(s):  
Matthew Macaulay ◽  
Pierre Rognon
Keyword(s):  
Granular Flows ◽  
Plane Shear ◽  
Self Diffusion ◽  
Physical Mechanisms ◽  
Dem Simulations ◽  
Starting Point ◽  
Correlated Motion ◽  
Contact Adhesion ◽  
Dense Granular Flows

This paper is concerned with the physical mechanisms controlling shear-induced diffusion in dense granular flows. The starting point is that of the granular random walk occurring in diluted granular flows, which underpins Bagnold’s scaling relating the coefficient of self-diffusion to the grain size and shear rate. By means of DEM simulations of plane shear flows, we measure some deviations from this scaling in dense granular flows with and without contact adhesion. We propose to relate these deviations to the development of correlated motion of grains in these flows, which impacts the magnitude of grain velocity fluctuations and their time persistence.

Shear-induced diffusion in cohesive granular flows: effect of enduring clusters

2018 ◽  
Vol 858 ◽  
Author(s):  
Matthew Macaulay ◽  
Pierre Rognon
Keyword(s):  
Shear Flows ◽  
Granular Flows ◽  
Time Correlation ◽  
Plane Shear ◽  
Velocity Fluctuations ◽  
Self Diffusion ◽  
Cohesive Forces ◽  
Dense Granular Flows

We investigate the effect of intergranular cohesive forces on the properties of self-diffusion in dense granular flows. The study is based on a series of simulated plane shear flows at different inertial and cohesion numbers, in which transverse diffusivities are measured. Results evidence an increase in diffusivity by up to two orders of magnitude when introducing cohesion. This strong effect is analysed using the Green–Kubo framework, expressing the diffusivity in terms of instantaneous grain velocity fluctuations and their time correlation. This analysis shows that cohesion, by forming enduring clusters in the flow, enhances the velocity fluctuations and their time persistence, which both contribute to enhancing grain mixing and self-diffusion.

Self-Diffusion in Granular Flows

1991 ◽  
Vol 16 (3) ◽  
pp. 255-258 ◽  
Author(s):  
O Zik ◽  
J Stavans
Keyword(s):  
Granular Flows ◽  
Self Diffusion

Self-diffusion study of bile salt-monoolein micelles determination of the intermicellar bile salt concentration

1983 ◽  
Vol 80 ◽  
pp. 315-323 ◽  
Author(s):  
Marc Lindheimer ◽  
Jean-Claude Montet ◽  
Roselyne Bontemps ◽  
Jacques Rouviere ◽  
Bernard Brun
Keyword(s):  
Bile Salt ◽  
Salt Concentration ◽  
Diffusion Study ◽  
Bile Salt Concentration ◽  
Self Diffusion

DEFECTS AFTER NEUTRON CAFTURE AND INTRINSIC FLUORINE SELF-DIFFUSION IN CaF2

1976 ◽  
Vol 37 (C7) ◽  
pp. C7-538-C7-539
Author(s):  
M. GRUPP ◽  
H. ACKERMANN ◽  
D. DUBBERS ◽  
H. GRUPP ◽  
P. HEITJANS ◽  
...  
Keyword(s):  
Self Diffusion
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