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Fluidization of a vertically vibrated two-dimensional hard sphere packing : A granular meltdown

Title data

Götzendorfer, Andreas ; Tai, Chi-Hwang ; Krülle, Christof A. ; Rehberg, Ingo ; Hsiau, Shu-San:
Fluidization of a vertically vibrated two-dimensional hard sphere packing : A granular meltdown.
In: Physical Review E. Vol. 74 (July 2006) Issue 1 . - no. 011304.
ISSN 1550-2376
DOI: https://doi.org/10.1103/PhysRevE.74.011304

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Abstract in another language

We report measurements of the fluidization process in vertically vibrated two-dimensional granular packings. An initially close packed granular bed is exposed to sinusoidal container oscillations with gradually increasing amplitude. At first the particles close to the free surface become mobile. When a critical value of the forcing strength is reached the remaining crystal suddenly breaks up and the bed fluidizes completely. This transition leads to discontinuous changes in the density distribution and in the root mean square displacement of the individual particles. Likewise the vertical center of mass coordinate increases by leaps and bounds at the transition. It turns out that the maximum container velocity v0 is the crucial driving parameter determining the state of a fully fluidized system. For particles of various sizes the transition to full fluidization occurs at the same value of v20/gd, where d is the particle diameter and g is the gravitational acceleration. A discontinuous fluidization transition is only observed when the particles are highly elastic.

Further data

Item Type: Article in a journal
Refereed: Yes
Keywords: Porous materials; Granular materials; Nonequilibrium and irreversible thermodynamics; Phase transitions: general studies; Order-disorder transformations.
Institutions of the University: Faculties > Faculty of Mathematics, Physics und Computer Science > Department of Physics > Chair Experimental Physics V > Chair Experimental Physics V - Univ.-Prof. Dr. Ingo Rehberg
Profile Fields > Advanced Fields > Nonlinear Dynamics
Faculties
Faculties > Faculty of Mathematics, Physics und Computer Science
Faculties > Faculty of Mathematics, Physics und Computer Science > Department of Physics
Faculties > Faculty of Mathematics, Physics und Computer Science > Department of Physics > Chair Experimental Physics V
Profile Fields
Profile Fields > Advanced Fields
Result of work at the UBT: Yes
DDC Subjects: 500 Science > 530 Physics
Date Deposited: 08 Jan 2019 08:06
Last Modified: 20 Feb 2019 09:59
URI: https://eref.uni-bayreuth.de/id/eprint/46794