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本文从化学剂在多孔介质中运移的对流-扩散方程出发,研究了溶质二维输运问题。采用的计算方法是特征线和有限差分相结合的方法。在此方法中,先用特征线法求出由对流项产生的浓度即所谓对流浓度,然后把对流浓度作为已知量,通过求解差分方程,解出同一个时段由弥散项及方程中其它项产生的浓度称为弥散浓度,二者相加,就得到了该时段的总浓度。通过选取不同的参数,我们研究了弥散、吸附对溶质浓度的影响。结果表明,本文采用的方法是可行的。本文的解,对于解决三次采油中的表面活性剂驱油、聚合物驱油以及处理地下水污染中的问题,都有一定的实用价值。
Based on the convection-diffusion equation of chemical migration in porous media, the problem of two-dimensional solute transport is studied. The calculation method used is a combination of feature line and finite difference. In this method, firstly, the characteristic line method is used to find the concentration produced by the convection term, the so-called convection concentration, and then the convection concentration is taken as the known quantity. By solving the difference equation, the solution of the diffusion term and other terms The resulting concentration is called the diffuse concentration, and the sum of the two gives the total concentration for that time period. By choosing different parameters, we studied the effect of dispersion and adsorption on solute concentration. The results show that this method is feasible. The solution of this paper has certain practical value for solving the problems of surfactant flooding, polymer flooding and groundwater pollution treatment in tertiary recovery.