Transport of adsorbing, radioactive species in a medium with porous structure defined by a distribution function

Technical Report · Thu Nov 01 04:00:00 EST 1973

OSTI ID:4940128

Rodliffe, R S

The transport of adsorbing, radioactive species by gaseous and surface diffusion is formulated for a porous medium described by a capillary type model with a distribution of pore sizes and orientations. The two cases considered are (1) laminar flow in the pores; transition and Knudsen diffusion effects absent; and (2) no flow in the pores; transition and Knudsen diffusion effects present. Adsorption is described by a Henry's law isotherm. Conservation equations are derived for the two cases and the resulting tensor diffusion coefficients are shown to be symmetric for arbitrary anisotropic, non-uniform porous media described by the distribution function. The analysis is applied to the simple case of an isotropic, non-uniform porous medium so that experimental results may be evaluated and theoretical predictions made from a knowledge of the pore size distribution of the material under consieration. (auth)

• Research Organization: Central Electricity Generating Board, Berkeley (UK). Berkeley Nuclear Labs.
• Sponsoring Organization: Sponsor not identified
• NSA Number: NSA-29-031657
• OSTI ID: 4940128
• Report Number(s): RD/B/N--2786; RPC/M3FPR/P--(74)2
• Country of Publication: United Kingdom
• Language: English

Related Subjects

ADSORPTION
DISTRIBUTION FUNCTIONS
FISSION PRODUCTS
FLOW MODELS
GASEOUS DIFFUSION
GASES
KNUDSEN FLOW
LAMINAR FLOW
N50330 --Metals
Ceramics
& Other Materials--Plastics & Other Materials-- Properties
Structure & Phase Studies
N80740* --General & Miscellaneous--Physics & Engineering
POROSITY
SURFACES