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Two phase flows of granular materials.

Arnarson, Birgir Orn.

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Two phase flows of granular materials.

Record Type:	Language materials, printed : Monograph/item
Title/Author:	Two phase flows of granular materials./
Author:	Arnarson, Birgir Orn.
Description:	144 p.
Notes:	Adviser: James T. Jenkins.
Contained By:	Dissertation Abstracts International60-08B.
Subject:	Applied Mechanics. -
Online resource:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=9941218
ISBN:	0599427507

Two phase flows of granular materials.
Arnarson, Birgir Orn.

Two phase flows of granular materials. - 144 p.

Adviser: James T. Jenkins.

Thesis (Ph.D.)--Cornell University, 1999.

The dissertation contains three projects. All three projects involve flows of two material phases with at least one phase being a granular material.

ISBN: 0599427507Subjects--Topical Terms:

1018410
Applied Mechanics.

Two phase flows of granular materials.
LDR:02708nam 2200301 a 45 001 932635
005 20110505
008 110505s1999 eng d
020 $a 0599427507
035 $a (UnM)AAI9941218
035 $a AAI9941218
040 $a UnM $c UnM
100 1 $a Arnarson, Birgir Orn. $3 1256376
245 1 0 $a Two phase flows of granular materials.
300 $a 144 p.
500 $a Adviser: James T. Jenkins.
500 $a Source: Dissertation Abstracts International, Volume: 60-08, Section: B, page: 4047.
502 $a Thesis (Ph.D.)--Cornell University, 1999.
520 $a The dissertation contains three projects. All three projects involve flows of two material phases with at least one phase being a granular material.
520 $a First, explicit constitutive relations for a binary mixture of nearly elastic disks are derived using a kinetic theory method called the Revised Enskog Theory. Comparison between the theoretical viscosity and viscosity found from numerical simulations is excellent up to moderate densities.
520 $a The second project involves a binary mixture of nearly elastic spheres. Existing constitutive relations derived from kinetic theory are corrected and then simplified for mixtures that differ only slightly in mass and diameter. A segregation study is then undertaken in a fully developed, steady, rectilinear flow. First, the thermal diffusion factor is defined and analyzed. It is a measure of local segregation and predicts that large particles tend to be in areas of low granular temperature. Following the local study, a boundary value problem is solved, giving a global picture of the segregation in a fully developed, steady, rectilinear flow between bumpy plates in relative motion. The results are compared with numerical simulations.
520 $a A specific model of a debris flow is considered in the third and last project. A two phase continuum model is devised for a mixture of an ideal fluid and uniformly sized particles. The constitutive relations for the particles are based on the idea of a bulk riding on a thin shear layer. The material behavior of the bulk is assumed to be governed by Mohr-Coulomb plasticity, but the shear layer is assumed to be a fully developed, steady, rectilinear flow with constitutive relations from kinetic theory. The shear layer determines the basal friction stress. A numerical solution of depth averaged equations shows some of the instabilities found in experiments.
590 $a School code: 0058.
650 4 $a Applied Mechanics. $3 1018410
690 $a 0346
710 2 0 $a Cornell University. $3 530586
773 0 $t Dissertation Abstracts International $g 60-08B.
790 $a 0058
790 1 0 $a Jenkins, James T., $e advisor
791 $a Ph.D.
792 $a 1999
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=9941218