PERCOLATION MODEL OF NUCLEAR MAGNETIC-RELAXATION IN POROUS-MEDIA

被引:42
作者
MENDELSON, KS
机构
[1] Physics Department, Marquette University, Milwaukee
来源
PHYSICAL REVIEW B | 1990年 / 41卷 / 01期
关键词
D O I
10.1103/PhysRevB.41.562
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
A random walk on a site percolation lattice with absorbing sites is used to simulate nuclear magnetic relaxation in a porous medium. The computed relaxation is compared to a sum of exponentials with relaxation rates proportional to the pore surface-to-volume ratios. Each isolated region of the pore space is treated as a single pore rather than as a collection of connected pores. Thus, above the percolation threshold, the pore space is essentially a single large pore. For fast diffusion this sum of exponentials gives excellent agreement with the computed results. It appears that measurements in the fast-diffusion range will give only an average surface-to-volume ratio of the pore space. © 1990 The American Physical Society.
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页码:562 / 567
页数:6
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