优势通道对多孔介质中多相反应输运过程影响的孔隙尺度研究  

Pore-scale study of effects of preferential path on multiphase reactive transport process in porous media

作　　者：张闯德 陈黎 ZHANG Chuangde;CHEN Li(Key Laboratory of Thermal Fluid Science and Engineering of Ministry of Education,School of Energy and Power Engineering,Xi’an Jiaotong University,Xi’an 710049,Shaanxi,China)

机构地区：[1]西安交通大学能源与动力工程学院,热流科学与工程教育部重点实验室,陕西西安710049

出　　处：《化工学报》2025年第1期161-172,共12页CIESC Journal

基　　金：国家自然科学基金项目(42141011)。

摘　　要：多孔介质中多相流-溶质输运-化学反应-固相演变的多场耦合反应输运过程对于许多科学和工程问题至关重要。建立孔隙尺度多相反应输运模型,研究了优势通道对多孔介质中多相反应输运过程的影响。结果表明,相比于单相反应输运过程形成沿优势通道扩展的虫洞,两相流的存在会改变传质路径,当非反应流体增多时,会封堵优势通道,抑制横向传质,导致虫洞溶解消失,固体溶解突破延后。此外,两相流的存在会使可供反应界面长度减小,平均反应物浓度在溶解突破后显著增大。The multiple coupled reactive transport process of multiphase flow-solute transport-chemical reactionsolid phase evolution in porous media is crucial for many scientific and engineering problems.In this paper,a porescale multiphase reactive transport model is established to study the influence of preferential path on the multiphase reactive transport process in porous media.The results show that compared with the single-phase reaction transport process,where the wormhole extends along the preferential path,the presence of two-phase flow changes the mass transfer path.When the non-reactive fluid increases,the preferential path is blocked by the non-reactive fluid and the transverse mass transfer is limited,resulting in the absence of wormhole dissolution,and the delay of solid dissolution breakthrough.In addition,the existence of the two-phase stream will reduce the length of the reaction interface,and the average reactant concentration will increase significantly after dissolving breakthroughs.

关 键 词：多相反应 传递过程 多孔介质 固体溶解 格子BOLTZMANN方法 

分 类 号：TK121[动力工程及工程热物理—工程热物理]