Mass Transfer From Nonaqueous Phase Organic Liquids in Water-Saturated Porous Media.
Mass Transfer From Nonaqueous Phase Organic Liquids in Water-Saturated Porous Media.
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DOI：
10.1029/92wr02581
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发表时间：
1993-04
影响因子：
5.4
通讯作者：
J. Geller;James R. Hunt
中科院分区：
文献类型：
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作者：
J. Geller;James R. Hunt
利用传质分析模拟了非水相液体(NAPLS)溶解实验结果。该模型将NAPL表示为随着溶解而收缩的孤立球体，并使用文献中报道的溶解球形固体的传质系数关联式。该模型考虑了残余NAPL区域的渗透率相对于周围清洁介质的渗透率的降低，这导致流动的水部分绕过残余NAPL。甲苯和苯-甲苯混合物的溶解实验是在水饱和的均质玻璃微珠柱中进行的，达西速度范围从0.5到10md(-1)。当NAPL完全溶解时，该模型可以表示观察到的出水浓度。在NAPL重新配置的初始阶段之后，预测了柱上的变化压降。拟合出的NAPL球直径为0.15~0.40 cm，与前人观察到的NAPL神经节的大小一致，且在最大流速时最小。
Results of dissolution experiments with trapped nonaqueous phase liquids (NAPLs) are modeled by a mass transfer analysis. The model represents the NAPL as isolated spheres that shrink with dissolution and uses a mass transfer coefficient correlation reported in the literature for dissolving spherical solids. The model accounts for the reduced permeability of a region of residual NAPL relative to the permeability of the surrounding clean media that causes the flowing water to partially bypass the residual NAPL. The dissolution experiments with toluene alone and a benzene-toluene mixture were conducted in a water-saturated column of homogeneous glass beads over a range of Darcy velocities from 0.5 to 10 m d(-1). The model could represent the observed effluent concentrations as the NAPL underwent complete dissolution. The changing pressure drop across the column was predicted following an initial period of NAPL reconfiguration. The fitted NAPL sphere diameters of 0.15 to 0.40 cm are consistent with the size of NAPL ganglia observed by others and are the smallest at the largest flow velocity.