Accession Number : ADA316636

Title :   A Pore Structure Model for Coupling Subscale Reactions to the Macroscopic Transport.

Descriptive Note : Final rept. 28 Sep 94-27 Sep 96,

Corporate Author : SIMONS RESEARCH ASSOCIATES LYNNFIELD MA

Personal Author(s) : Simons, Girard A.

PDF Url : ADA316636

Report Date : 30 SEP 1996

Pagination or Media Count : 42

Abstract : The 'pore tree' model of pore structure (Simons and Finson, 1979; Simons, 1982) was developed for catalyst and sorbent grains to allow coupled diffusion and chemical reactions within porous media in the absence of convection through the media. The pore tree model has been extended to describe the permeable pore structure which characterizes the subsurface flow of gas and water in soil. The description of permeability required a statistical determination of the 'branches' that are common to several trees to allow percolation through the large scale (mobile) structure in addition to diffusion through the smaller scale (immobile) structure. Subsequently, the pore tree model has been adapted to describe hydrodynamic dispersion which represents a preliminary step in the description of the subscale convection necessary to relate macroscopic transport, subscale diffusion and chemical reactions. A methodology has been developed to couple sub scale convection, diffusion and chemical reactions to the macroscopic transport in order to accurately describe contaminant transport and in-situ remediation in (Ground Water Simulation codes.

Descriptors :   *PERMEABILITY, *TRANSPORT PROPERTIES, *POROUS MATERIALS, COUPLING(INTERACTION), SIMULATION, DISPERSING, STATISTICS, GROUND WATER, SCALE, CHEMICAL REACTIONS, TRANSPORT, CONTAMINANTS, CATALYSTS, HYDRODYNAMICS, PORE PRESSURE, SUBSURFACE, GAS FLOW, PERCOLATION.

Subject Categories : Physical Chemistry
      Fluid Mechanics

Distribution Statement : APPROVED FOR PUBLIC RELEASE