Call number:
ZSP-202-285
In:
Effect of thermal gradient on ionic diffusion in frozen earth materials
Description / Table of Contents:
CONTENTS: Introduction. - Part I. - Formulation of problem. - Solution of the Laplace transform equation. - Inverse transformation. - Computation of concentration distribution. - Results of computation. - Part II. - Introduction. - Numerical solution of initial-value problems for linear parabolic partial differential equations. - Application. - Computation of the diffusion process [Xi]t. - Results of computation. - Literature cited. - Abstract.
Description / Table of Contents:
The influence of a temperature gradient on the redistribution of chemicals by diffusion through thin films of interfacial water in frozen sedl 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.
Type of Medium:
Series available for loan
Pages:
iii, 35 Seiten
,
Illustrationen
Series Statement:
285
URL:
http://www.worldcat.org/oclc/5976449
Language:
English
Branch Library:
AWI Library
