Effects of medium and pore‐fluid compressibility on chemical‐dissolution front instability in fluid‐saturated porous media
Effects of medium and pore‐fluid compressibility on chemical‐dissolution front instability in fluid‐saturated porous media
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DOI：
10.1002/nag.1052
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发表时间：
2012-06
影响因子：
4
通讯作者：
Chong-bin Zhao;B. Hobbs;A. Ord
中科院分区：
文献类型：
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作者：
Chong-bin Zhao;B. Hobbs;A. Ord
通过理论分析和数值模拟，研究了介质和孔隙流体的可压缩性对化学溶解前沿传播的影响，这是一个孔隙度、孔隙流体压力、孔隙流体密度和反应性化学物质在可变形和流体饱和多孔介质中迁移的完全耦合的非线性问题。当完全耦合的非线性系统处于亚临界状态时，已经推导出了化学物种的平衡浓度与固体摩尔密度之比接近于零的特殊情况下的一些解析解。为了研究介质可压缩性或孔隙流体可压缩性对超临界化学溶解系统中化学溶解前沿演化的影响，还提出了数值算法和程序。相关的理论和数值计算结果表明：（1）孔隙流体的可压缩性不仅影响亚临界和超临界体系中化学溶解前沿的传播速度，而且影响超临界体系中不规则化学溶解前沿的增长和振幅;介质的可压缩性对化学溶解前沿的传播速度影响不大，但它可能对超临界系统中不规则化学溶解前沿的增长和幅度产生重大影响;（iii）介质和孔隙流体的可压缩性可能会稳定超临界化学溶解系统中的不规则化学溶解前沿。版权所有© 2011约翰威利父子有限公司.
Theoretical analysis and computational simulations have been carried out to investigate how medium and pore‐fluid compressibility affects the chemical‐dissolution front propagation, which is associated with a fully‐coupled nonlinear problem between porosity, pore‐fluid pressure, pore‐fluid density and reactive chemical‐species transport within a deformable and fluid‐saturated porous medium. When the fully‐coupled nonlinear system is in a subcritical state, some analytical solutions have been derived for a special case, in which the ratio of the equilibrium concentration to the solid molar density of the chemical species is approaching zero. To investigate the effect of either medium compressibility or pore‐fluid compressibility on the evolutions of chemical dissolution fronts in supercritical chemical dissolution systems, numerical algorithms and procedures have been also proposed. The related theoretical and numerical results have demonstrated that: (i) not only can pore‐fluid compressibility affect the propagating speeds of chemical dissolution fronts in both subcritical and supercritical systems, but also it can affect the growth and amplitudes of irregular chemical dissolution fronts in supercritical systems; (ii) medium compressibility may have a little influence on the propagating speeds of chemical dissolution fronts, but it can have significant effects on the growth and amplitudes of irregular chemical dissolution fronts in supercritical systems; and (iii) both medium and pore‐fluid compressibility may stabilize irregular chemical‐dissolution‐fronts in supercritical chemical dissolution systems. Copyright © 2011 John Wiley & Sons, Ltd.