Accession Number : ADA290725

Title :   Extension of the 'Pore Tree' Model to Describe Convection.

Descriptive Note : Technical rept.,

Corporate Author : SIMONS RESEARCH ASSOCIATES LYNNFIELD MA

Personal Author(s) : Simons, Girard A.

PDF Url : ADA290725

Report Date : 18 NOV 1994

Pagination or Media Count : 18

Abstract : The 'pore tree' model of pore structure was developed for catalysts and sorbents to allow diffusion within a porous media in the absence of convection through the media. The pore tree model is extended herein to describe the permeable pore structure which characterizes the subsurface flow of water in soil, the dispersion of contaminants and the in-situ remediation of contaminated sites. Permeability requires 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. While permeability is dominated by the largest pores, it is important to determine the level of convection that is occurring at the intermediate scales in order to accurately describe transport. (AN)

Descriptors :   *MATHEMATICAL MODELS, *CONVECTION, *SOIL CHEMISTRY, WATER FLOW, PERMEABILITY, DISPERSING, CHEMICAL CONTAMINATION, POROSITY, ABSORBERS(MATERIALS), CATALYSTS, DIFFUSION, SOIL POLLUTION, SUBSURFACE, DISTRIBUTION FUNCTIONS, POROUS MATERIALS, ADSORBENTS, PERCOLATION.

Subject Categories : Fluid Mechanics
      Soil Mechanics
      Statistics and Probability

Distribution Statement : APPROVED FOR PUBLIC RELEASE