EFFECTIVE DIFFUSION COEFFICIENT IN POROUS MEDIA

reportActive / Technical Report | Accession Number: AD0410160 | Open PDF

Abstract:

Recent calculations of upper bounds for the ef fective diffusion coefficient or conductivity in porous media, in terms of certain statistical parameters of the random geometry, are reformulated so as to apply specifically to a bed of spherical particles. The calculations are simplified by considering an idealized bed in which centers are randomly situated without restricting the spheres to nonoverlapping locations. The result, applicable to randomly overlapping spheres either uniform or nonuniform sizes, gives the upper bound for the effective diffusion coeffi cient. The result is compared with experimental results by various investigators for nonoverlapping spheres and also with the best upper bound that can be calculated without taking the sta tistics of a particular random geometry into account.

Author(s):
Weissberg, Harold L.
Author Organization(s):
UNION CARBIDE NUCLEAR CO OAK RIDGE TN
Supplementary Note:
In cooperation with Minnesota U., Minneapolis, Contract AF49 638 720.
Annotation:
The effective diffusion coefficient in porous media.
Pagination:
0014

Security Markings

DOCUMENT & CONTEXTUAL SUMMARY

Distribution:
Approved For Public Release
Distribution Statement:
Approved For Public Release; Distribution Is Unlimited.

RECORD

Collection: TR
Identifying Numbers
Report Number(s):
AFOSR-4684
Monitor Series:
4684, AFOSR
 Subject Terms
Joint Capability Areas:
JCA_3.2_Engagement; JCA_3_Force Application; JCA_1.2_Force Preparation; JCA_1_Force Support; JCA_3.2.1_Kinetic Means; JCA_1.2.3_Educating
Communities of Interest:
No COI(s) Identified
Descriptor(s):
*DIFFUSION, *POROUS MATERIALS, PARTICLE SIZE, EXPERIMENTAL DATA, SPHERES, STATISTICAL ANALYSIS, THERMAL CONDUCTIVITY, GEOMETRY, MATHEMATICS
Field(s)/Group(s):
Ceramics, Refractories and Glass, Physical Chemistry
Keyword(s):
VOID FRACTION
Report Date:
1963 Jan 01