In this study, the effect of the gas-liquid phase separation caused by seawater boiling on the carbonate crack dissolution process was investigated using the lattice Boltzmann (LB) method at the pore scale. The gas-liquid two-phase flow with phase change, heat transfer, and solute transport is described by a single-component multiphase LB model, thermal LB model, and mass transport LB model, respectively. In addition, the dissolved solid mass is calculated via the Volume of Pixel method. The main conclusions are as follows: the phase separation negatively affects dissolution, especially in the upper boundary of the crack. Moreover, the negative effect is strengthened with the increase in inlet velocity and the decrease in crack width while the influence of wettability on dissolution is non-linear and its degree depends on the phase distribution of the two phases. In addition, slug flow greatly hinders solute transport but may accelerate the dissolution reaction near the inlet.

在这项研究中，使用格氏玻尔兹曼（LB）方法在孔隙尺度上研究了海水沸腾引起的气液相分离对碳酸盐裂化过程的影响。具有单相多相LB模型，热LB模型和传质LB模型分别描述了具有相变，传热和溶质传递的气液两相流。另外，通过像素体积法计算溶解的固体质量。主要结论如下：相分离对溶解有负面影响，特别是在裂纹的上边界。而且，随着入口速度的增加和裂纹宽度的减小，负面影响进一步增强，而润湿性对溶解的影响则是非线性的，其程度取决于两相的分布。此外，团状流动大大阻碍了溶质的运输，但可能会加速入口附近的溶解反应。