Simulation of dissolution and precipitation in porous media
Simulation of dissolution and precipitation in porous media
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DOI：
10.1029/2003jb002504
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发表时间：
2003-10
影响因子：
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通讯作者：
Q. Kang;Dongxiao Zhang;Shiyi Chen
中科院分区：
文献类型：
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作者：
Q. Kang;Dongxiao Zhang;Shiyi Chen
[1]我们应用格子-Boltzmann方法模拟了多孔介质中流体在反应固相中的流动、溶解和析出。同时考虑了对流和扩散以及孔隙空间中的时间几何变化。数值结果表明，在较高的Peclet数和Peclet-Damkohler数下，由于溶解过程，形成了虫洞，渗透率大大增加。在低Peclet数和高Peclet-Damkohler数下，反应主要发生在入口边界，导致界面溶解，溶解过程中渗透率增加最慢。在中等Peclet数和Peclet-Damkohler数时，反应通常是不均匀的，上游反应较多，下游反应较少。在很小的Peclet-Damkohler数下，溶解或沉淀是高度均匀的，这两个过程可以近似地相互逆转。这些数值算例尚未得到物理实验的证实。然而，我们相信这些模拟结果可以用来估计反应流体流动过程中溶解和沉淀的影响。
[1] We apply the lattice-Boltzmann method to simulate fluid flow and dissolution and precipitation in the reactive solid phase in a porous medium. Both convection and diffusion as well as temporal geometrical changes in the pore space are taken into account. The numerical results show that at high Peclet and Peclet-Damkohler numbers, a wormhole is formed and permeability increases greatly because of the dissolution process. At low Peclet and high Peclet-Damkohler numbers, reactions mainly occur at the inlet boundary, resulting in the face dissolution and the slowest increase of the permeability in the dissolution process. At moderate Peclet and Peclet-Damkohler numbers, reactions are generally nonuniform, with more in the upstream and less in the downstream. At very small Peclet-Damkohler number, dissolution or precipitation is highly uniform, and these two processes can be approximately reversed by each other. These numerical examples have not been yet confirmed by physical experimentation. Nevertheless, we believe that these simulation results can serve to estimate the effects of dissolution and precipitation during reactive fluid flow.