致密多孔介质内的相变传热与流动问题广泛存在于能源、环境工业及工程应用中，研究其内部物理机理对多孔隔热材料的开发、热管中的流动现象、油气开采等有重要指导意义。由于该问题跨越多个时空尺度，内部粒子相互作用复杂，以及包含流动、传热、传质、界面动力学物理化学过程，传统的数值方法在研究这类问题的微观机理时受到很大限制。而基于介观动理论的格子Boltzmann（LB）方法处理以上瓶颈有独特的优势。鉴于此，本项目将采用LB方法，并借助高性能计算技术，对致密多孔介质内的相变传热与流动微观机理进行研究，主要包括：发展考虑微尺度效应的耦合热质传输的气液两相流LB模型；构建准确刻画流体与壁面相互作用的润湿性边界条件及适用于多分叉结构的进出口边界条件；分析孔隙结构、密度比、润湿性、壁面温度等对多孔介质内气液流动特点和传热性能的影响，探索强化换热的方法与手段。

The issue of phase-change heat transfer and flow in tight porous media widely exists in the energy, environment, industrial and engineering application. The study of its internal physical mechanism has the guide meaning for the development of the porous insulation and heat pipe, oil and gas production. However, the problem overs large temporal and spatial scale, the interaction of the internal particle is complex, and contains complex physics and chemistry processes of flow, heat transfer, mass transfer，and interface dynamic. These features limit the traditional methods in studying its microscopic mechanism， while the lattice Boltzmann (LB) method that based on mesoscopic kinetic can overcome these bottlenecks. In view of this, LB method will be developed to study the phase-change heat transfer and flow in tight porous media, with high-performance computing technology. The research topics include: building two-phase LB model that includes micro-scale effect and couples with heat and mass transfer, designing wetting boundary condition that can accurately describe the interaction of the fluid and the solid and the inlet and outlet boundary condition that can apply to bifurcate channel, analyzing the impact of pore structure, density ratio, wettability, solid temperature on the flow characteristics and heat transfer performance, and exploring the ways and means in strengthening heat transfer..