摘要
本文重新分析了Taylor经典的剪切分散理论,指出了Taylor理论成立的主要物理机理在于:断面内扩散尺度和纵向扩散尺度之间存在着量级上的差别。为此将浓度方程进行无量纲化,采用摄动方法求得了非定常条件下的Taylor高阶剪切分散理论。其结果与Gill和Sankasubramanian等人的结果相一致,并且得到含边界吸收条件下的剪切分散系数。
Based on reanalysing Taylor's sheaz dispersion theory, the physical mechanism of Taylor's theory is the difference between the scales of sectional diffusion and longitudinal diffusion. By non-dimensionizing the diffusion equation and using the pertubation method, the author had obtained the higher-order theory of Taylor's shear dispersion for unsteady flows, which is concide with the Gill & Sankasubamanian's result. On the other hand, the shear dispersion coefficiences for unsteady flows with the boundary absorption hed been gotter.
出处
《水动力学研究与进展（A辑）》
CSCD
北大核心
1997年第3期372-378,共7页
Chinese Journal of Hydrodynamics
基金
国家自然科学基金资助项目
