A METHOD OF DISPERSION COEFFICIENT MEASUREMENT

Abstract

A new method of dispersion coefficient measurement is proposed, based on the measurement of mean first-passage time from an internal position to either boundary of the control region. The features of the method are as follows:
1. It can be applied to a system where the dispersion phenomenon is controlled by random motion of material.
2. Mean dispersion coefficient of a local region in a non-homogeneous system can be evaluated. There exists an optimal scale of control region for the method, and four times the scale of phenomena is recommended for the size of control region.