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The physics of dense granular matter.

Wambaugh, John.

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The physics of dense granular matter.

Record Type:	Language materials, printed : Monograph/item
Title/Author:	The physics of dense granular matter./
Author:	Wambaugh, John.
Description:	201 p.
Notes:	Adviser: Robert Behringer.
Contained By:	Dissertation Abstracts International68-07B.
Subject:	Physics, Fluid and Plasma. -
Online resource:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3271009
ISBN:	9780549109532

The physics of dense granular matter.
Wambaugh, John.

The physics of dense granular matter. - 201 p.

Adviser: Robert Behringer.

Thesis (Ph.D.)--Duke University, 2006.

Granular materials range in size from micron-sized pharmaceuticals to mountain-sized asteroids. Despite this great range of scales, certain aspects of their underlying physics are universal. In the case of dense, dry granular materials the physics is dominated by interparticle contacts. Because the mobilization of friction introduces an element of history dependence, the actual state of a granular system is not necessarily apparent without a careful study of how that state came to be. Additionally, the distribution of forces carried by interparticle contacts has been shown to be highly irregular, even for regularly packed grains. In dense granular matter there are large force fluctuations, many times greater than the mean, that are carried long distances over filament-like chains of contacts, forming complicated force networks. Features such as this are due to the non-equilibrium nature of granular matter. Because the influence of temperature is negligible even for micron-sized particles, the smallest push can potentially cause a system-wide avalanche. Since non-equilibrium physics of any type is in its infancy, the study of dense granular matter is an attempt to explore potential approaches to understand any non-equilibrium system. I have adapted experimental and analytic techniques to the exploration of this physics. I have evaluated the applicability of soil mechanics-based continuum approaches to describe the non-linear phenomena of dense granular flows. I have also investigated continuum descriptions of static granular matter under gravity. In both cases, I have examined the influence of large fluctuations on their behavior and in the case of static systems I have proposed describing those fluctuations in the language of percolation theory. I have found that certain regimes exist in which the discrete nature of granular matter can be smoothed over by a continuum description, but more importantly I have found many places where granular phenomena cannot be ignored.

ISBN: 9780549109532Subjects--Topical Terms:

1018402
Physics, Fluid and Plasma.

The physics of dense granular matter.
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005 20110517
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020 $a 9780549109532
035 $a (UMI)AAI3271009
035 $a AAI3271009
040 $a UMI $c UMI
100 1 $a Wambaugh, John. $3 1264027
245 1 4 $a The physics of dense granular matter.
300 $a 201 p.
500 $a Adviser: Robert Behringer.
500 $a Source: Dissertation Abstracts International, Volume: 68-07, Section: B, page: 4560.
502 $a Thesis (Ph.D.)--Duke University, 2006.
520 $a Granular materials range in size from micron-sized pharmaceuticals to mountain-sized asteroids. Despite this great range of scales, certain aspects of their underlying physics are universal. In the case of dense, dry granular materials the physics is dominated by interparticle contacts. Because the mobilization of friction introduces an element of history dependence, the actual state of a granular system is not necessarily apparent without a careful study of how that state came to be. Additionally, the distribution of forces carried by interparticle contacts has been shown to be highly irregular, even for regularly packed grains. In dense granular matter there are large force fluctuations, many times greater than the mean, that are carried long distances over filament-like chains of contacts, forming complicated force networks. Features such as this are due to the non-equilibrium nature of granular matter. Because the influence of temperature is negligible even for micron-sized particles, the smallest push can potentially cause a system-wide avalanche. Since non-equilibrium physics of any type is in its infancy, the study of dense granular matter is an attempt to explore potential approaches to understand any non-equilibrium system. I have adapted experimental and analytic techniques to the exploration of this physics. I have evaluated the applicability of soil mechanics-based continuum approaches to describe the non-linear phenomena of dense granular flows. I have also investigated continuum descriptions of static granular matter under gravity. In both cases, I have examined the influence of large fluctuations on their behavior and in the case of static systems I have proposed describing those fluctuations in the language of percolation theory. I have found that certain regimes exist in which the discrete nature of granular matter can be smoothed over by a continuum description, but more importantly I have found many places where granular phenomena cannot be ignored.
590 $a School code: 0066.
650 4 $a Physics, Fluid and Plasma. $3 1018402
690 $a 0759
710 2 $a Duke University. $3 569686
773 0 $t Dissertation Abstracts International $g 68-07B.
790 $a 0066
790 1 0 $a Behringer, Robert, $e advisor
791 $a Ph.D.
792 $a 2006
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3271009