Accession Number : AD0714642

Title :   Effect of Thermal Gradient on Ionic Diffusion in Frozen Earth Materials. II: Theoretical.

Descriptive Note : Research rept.,

Corporate Author : COLD REGIONS RESEARCH AND ENGINEERING LAB HANOVER N H

Personal Author(s) : Nakano,Yoshisuke ; Murrmann,Richard P.

Report Date : OCT 1970

Pagination or Media Count : 40

Abstract : The influence of a temperature gradient on the redistribution of chemicals by diffusion through thin films of interfacial water in frozen soil was predicted by two different methods. In one case, an exact solution of the diffusion equation with a distance-dependent diffusion coefficient was obtained. Secondly, a new approach based on the Monte Carlo method was developed. The advantage of the Monte Carlo method is that the dependence of the diffusion coefficient on distance may assume any functionality where one exponential form was used in obtaining the exact solution. The ionic concentration distributions computed using both approaches were in excellent agreement with experimental results. In all cases, the concentration distribution was virtually the same as that obtained in the absence of a thermal gradient, indicating that thermal gradients have little influence on the diffusion of ions in frozen soil. (Author)

Descriptors :   (*SOILS, DIFFUSION), (*CLAY MINERALS, *IONS), MONTE CARLO METHOD, TEMPERATURE, FREEZING, ICE, WATER, SALTS, THEORY

Subject Categories : Soil Mechanics

Distribution Statement : APPROVED FOR PUBLIC RELEASE