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Updated: May 31, 2026

An Analog Macroscopic Technique for Studying Molecular Hydrodynamic Processes in Dense Gases and Liquids

An Analog Macroscopic Technique for Studying Molecular Hydrodynamic Processes in Dense Gases and Liquids

Published on: December 4, 2017

Defining random loose packing for nonspherical grains.

Gary W Delaney¹, James E Hilton, Paul W Cleary

¹CSIRO Mathematics, Informatics and Statistics, Clayton South, VIC 3169, Australia.

Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics

|July 7, 2011

Summary

This summary is machine-generated.

Random loose packing (RLP) of ellipsoids, achieved through slow settling, reveals significant orientational ordering, challenging the definition of RLP for nonspherical grains. These ordered packings differ from random sphere packings.

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Area of Science:

Materials Science
Physics
Statistical Mechanics

Background:

The concept of random loose packing (RLP) is well-established for spherical grains.
RLP is typically defined as the loosest packing achievable by pouring grains.

Purpose of the Study:

To investigate the structural properties of packings of nonspherical grains (ellipsoids).
To determine if sedimentation or pouring techniques generate random loose packings for ellipsoids.
To analyze the impact of grain shape and interparticle friction on packing structure.

Main Methods:

Simulating slow settling of ellipsoids in a viscous liquid.
Analyzing the structural properties, including orientational order, of the resulting ellipsoid packings.
Comparing packing structures of ellipsoids with those of spheres.

Main Results:

Loosest ellipsoid packings are formed with high interparticle friction, similar to spheres.
Unlike spheres, ellipsoid packings exhibit significant orientational ordering.
This ordering increases with the aspect ratio of the ellipsoids.
Sedimentation or pouring methods do not produce random packings for ellipsoids.

Conclusions:

The commonly accepted definition of RLP, based on pouring spheres, is not applicable to nonspherical grains like ellipsoids.
Sedimentation of ellipsoids leads to ordered, non-random packings.
Further research is needed to redefine RLP for nonspherical granular materials.