Magnetic resonance imaging study of the dissolution kinetics of octanol in porous media
Magnetic resonance imaging study of the dissolution kinetics of octanol in porous media
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DOI：
10.1006/jcis.1998.5950
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发表时间：
1999-02-15
影响因子：
9.9
通讯作者：
Gladden, LF
中科院分区：
文献类型：
--
作者：
Johns, ML;Gladden, LF
磁共振成像（MRI）用于通过移动的水相观察随机填充的玻璃球床孔隙内的辛醇包埋神经节或"团块"的溶解。MRI提供三维图像，能够区分固体、烃和水相，以及移动的水相的速度图。烃相的溶解已经使用一维对流-分散描述建模，该描述结合了烃和水相之间的传质项。该传质项的关键是描述烃相和水相之间的界面面积，该界面面积积极参与溶解，并且可以直接从图像中确定。最好的实验数据建模通过评估一个有效的界面面积项表征的烃/水边界，其中不包括在粒子间空间的最大收缩。MRI可视化的孔隙空间和流动过程中发生的结构，表明在流动中的不均匀性在颗粒间空间内的单个孔的长度尺度引起显着的不均匀性在溶解过程中，这变得显着在低烃饱和度。(C)北京：科学出版社.
Magnetic resonance imaging (MRI) is used to visualize the dissolution of entrapped ganglia or "blobs" of octanol within the pore space of a randomly packed bed of glass ballotini, by a mobile aqueous phase. MRI provides three dimensional images, able to distinguish the solid, hydrocarbon, and aqueous phases, as well as velocity maps of the mobile aqueous phase. Dissolution of the hydrocarbon phase has been modeled using a one dimensional advection-dispersion description incorporating a mass transfer term between the hydrocarbon and aqueous phases. Essential to this mass transfer term is a description of the interfacial area between the hydrocarbon and aqueous phases which is actively involved in dissolution and which can be determined directly from the images. The experimental data are best modeled by evaluating an effective interfacial area term characterizing the hydrocarbon/water boundary which excludes the narrowest constrictions within the interparticle space. MRI visualizations of the structure of the pore space and the flow processes occurring within it, demonstrate that heterogeneities in the flow at the length-scale of individual pores within the interparticle space cause significant heterogeneity in the dissolution process which becomes significant at low hydrocarbon saturations. (C) 1999 Academic Press.