EFFECTIVE DIFFUSION COEFFICIENT IN POROUS MEDIA

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.

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Document Details

Document Type
Technical Report
Publication Date
Jan 01, 1963
Accession Number
AD0410160

Entities

People

  • Harold L. Weissberg

Tags

DTIC Thesaurus Topics

  • Air Force
  • Coefficients
  • Conductivity
  • Contracts
  • Diffusion
  • Diffusion Coefficient
  • Electrical Conductivity
  • Electricity
  • Experimental Data
  • Geometry
  • Government Procurement
  • Probability
  • Scientific Research
  • Statistical Data
  • Statistics
  • Three Dimensional
  • X Ray Scattering

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