中文摘要：

发展数值模拟模型有助于深入了解多孔介质内溶质弥散规律。目前尚没有准确的数值模型能用于具有随机孔隙连接性的多孔介质内的溶质弥散过程描述。文中构造了一个颗粒填充柱单元体结构,并应用体积平均方法与数值模拟相结合计算得到了对应颗粒填充柱内溶质的弥散系数。计算获得了单元体结构内部的速度场与不同平均流速下的弥散系数,并提出了一个预测颗粒填充柱内溶质弥散系数的经验关联式。预测结果与实验数据、数值模拟结果的对比表明：采用文中构造的颗粒填充柱单元体模型与体积平均方法可以定性预测实际颗粒填充柱内的溶质弥散行为。

英文摘要：

Establishing numerical simulation models contribute to the understanding of the solute dispersion behavior in porous media. Currently, there are seldom accurate numerical models that can be used to predict the solute dispersion behavior in porous media with random pore connectivity. A hypothetical particle packed column was constructed by a numerical method and the solute dispersion coefficient in the column was predicted by the volume averaging method. The velocity distributions in the unit cell and dispersion coefficients for various average velocity values were obtained. A correlation for the prediction of the dispersion coefficient was proposed. The predicted longitudinal dispersion coefficient was compared with the available experimental data and a reasonable agreement was observed, which indicates that the solute dispersion behavior in real particle packed columns can be predicted by the volume averaging method and numerically generated particle packed column geometry.