Pore‐scale modeling and upscaling of nonaqueous phase liquid mass transfer
Pore‐scale modeling and upscaling of nonaqueous phase liquid mass transfer
复制标题
非水相液体传质的孔隙尺度建模和升级
DOI：
10.1029/2000wr900274
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发表时间：
2001
影响因子：
5.4
通讯作者：
M. Celia
中科院分区：
文献类型：
--
作者：
R. Held;M. Celia
建立了一个孔隙尺度模型来模拟多孔介质中两相流体之间的传质过程。该方法使用了对孔隙空间的网络描述，并建立在对孔隙网络中流体-流体界面的显式跟踪的基础上。传质采用局部质量流经各界面的形式进行计算，并用特征线法求解孔网络中的传输方程。采用停滞层扩散的概念来描述界面传质，计算出的局部浓度控制传质速率。模型结果预测了在多孔介质的柱状实验中最初在剩余非水相饱和度时形成的溶解前沿。研究了宏观传质系数的定义，并对严格增加的量进行了比较。
A pore‐scale model is developed to simulate mass transfer between two fluid phases in a porous medium. The approach uses a network description of the pore space and builds on explicit tracking of the fluid‐fluid interfaces in the pore network. Mass transfer is computed as local mass fluxes across each interface, and transport equations are solved in the pore network by a characteristic method. The concept of stagnant‐layer diffusion is used to describe the interface mass transfer, where calculated local concentrations control the rates of mass transfer. The model results predict dissolution fronts developed in column experiments of porous media initially at residual nonaqueous phase saturation. The definition of macroscopic mass transfer coefficients is investigated, and comparisons are made for rigorously upscaled quantities.