Methods for determining transverse dispersion coefficients of porous media in laboratory column experiments
Methods for determining transverse dispersion coefficients of porous media in laboratory column experiments
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实验室柱实验中多孔介质横向分散系数的测定方法
DOI：
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发表时间：
1989
期刊：
影响因子：
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通讯作者：
G. Robbins
中科院分区：
文献类型：
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作者：
G. Robbins
提出了用连续点源法和瞬时有限源法测定饱和多孔介质横向色散系数的方法。该方法需要从嵌入多孔介质的进样器中注入保守示踪剂，从示踪剂撞击柱壁处监测柱上梯度内浓度随时间的变化，并使用三维平流-弥散公式从相对浓度-时间数据中提取纵向和横向弥散系数值。这些方法在填充有玻璃珠的柱中进行了测试，以与报告的流量罐测试进行比较。用柱试验数据计算的横向弥散系数值与流槽试验结果吻合较好。所提出的方法为研究多孔介质中的色散现象提供了新的途径，特别是为确定未扰动岩心样品的横向和纵向色散系数提供了潜力。
Continuous point source and instantaneous finite source methods are presented for determining the transverse dispersion coefficient of saturated porous media in laboratory column experiments. The methods entail injecting a conservative tracer from an injector embedded in a porous medium, monitoring concentration variations with time within the column upgradient from where the tracer impinges on the column wall, and extracting longitudinal and transverse dispersion coefficient values from relative concentration-time data using three-dimensional advection-dispersion formulations. The methods were tested in a column packed with glass beads for comparison with reported flow tank tests. The transverse dispersion coefficient values calculated using column test data agree closely with flow tank results. The methods presented offer new approaches for investigating dispersion phenomena in porous media and especially offer the potential for determining the transverse as well as the longitudinal dispersion coefficient of undisturbed core samples.