Lattice Boltzmann modelling of salt precipitation during brine evaporation
Lattice Boltzmann modelling of salt precipitation during brine evaporation
复制标题
DOI：
10.1016/j.advwatres.2023.104542
复制
发表时间：
2023-10
影响因子：
4.7
通讯作者：
Junyu Yang;Timan Lei;Geng Wang;Qianghui Xu;Jin Chen;K. H. Luo
中科院分区：
文献类型：
--
作者：
Junyu Yang;Timan Lei;Geng Wang;Qianghui Xu;Jin Chen;K. H. Luo
多孔介质中卤水蒸发过程中的盐沉淀是各种自然和工程场景中的重要现象。本文建立了一种相变多相多分量晶格玻尔兹曼（LB）方法，用于模拟盐水蒸发过程中的盐沉淀。在所提出的LB模型中，同时考虑了气卤多相流动、卤水蒸发、盐浓度演化、盐沉淀成核和长大等过程。首先对Stefan问题进行了模拟，以验证所提出的数值模型，并确定了盐水蒸汽的扩散系数。一旦晶格玻尔兹曼模型得到验证，模拟盐水蒸发过程中的盐沉淀，研究盐沉淀成核和生长反应之间的竞争机制。结果表明，该方法可以成功再现现有实验观测中典型的盐降水模式，包括环状和薄饼状模式。根据本研究，盐沉淀模式的差异可以用沉淀生长和成核之间的竞争机制来解释。进一步研究了微流控芯片注气过程中的盐析出现象。盐和盐水饱和度的演化规律与已有实验结果相似，并阐明了注气速率对盐析出性能的影响。本文的LB模型可以综合考虑多相卤水蒸发、盐种质量输运、沉淀成核和生长等因素，模拟盐降水，这是以往研究没有实现的。数值模拟结果表明，所提出的多孔介质盐沉降模拟模型具有良好的性能，有望指导二氧化碳封存等实际工程应用。
Salt precipitation during brine evaporation in porous media is an important phenomenon in a variety of natural and engineering scenarios. This work establishes a multiphase multicomponent lattice Boltzmann (LB) method with phase change for simulating salt precipitation during brine evaporation. In the proposed LB models, the gas–brine multiphase flow, brine evaporation, salt concentration evolution, salt precipitate nucleation and growth are simultaneously considered. Simulations of the Stefan problem are first conducted to verify the proposed numerical models and determine the diffusion coefficient of brine vapour. Once the lattice Boltzmann models have been validated, salt precipitation during brine evaporation is simulated to investigate the competition mechanisms between salt precipitate nucleation and growth reaction. The results show that the typical salt precipitation patterns in existing experimental observation can be successfully reproduced, including the ring-like and pancake-like patterns. The difference in the salt precipitation patterns is explained by the competition mechanism between precipitate growth and nucleation according to the present study. Furthermore, the salt precipitation during gas injection into a microfluidic chip is investigated. The evolution of salt and brine saturation shows similar patterns to existing experimental results, and the effects of the gas injection rate on salt precipitation performance are clarified. The LB models in the present work can simulate salt precipitation with comprehensive consideration of multiphase brine evaporation, salt species mass transport, precipitate nucleation and growth, which have not been realized in previous studies. The numerical showcases demonstrate the excellent performance of the proposed models for the simulation of salt precipitation in porous media, which promise to guide practical engineering applications like CO2sequestration.