本项目主要研究太阳能光解制氢等能量转化与传输过程中复杂多物理场作用下的多相相间作用和输运机理，特别是氢气泡的形成和发展动力学，基于光生电子-空穴的迁移构建"太阳能-氢能"体系内能质传输转化每个关键步的受限理论，揭示太阳能光解制氢能质传输过程中驱动力和阻力作用的机理并建立准确的计算模型；同时对气液两相与多相流引入多流场多相流模型，采用单群界面浓度输运方程考虑离散相粒子直径的变化，通过实验及理论研究建立三维气液两相流中相间由于夹带等现象引起的一系列质量交换计算模型；建立和发展普适性的完整的多流场三维多相流热物理模型；在相对较低的计算耗时下，实现对气液两相流的动态跟踪和三维数值预测模拟；建立关于存在相变的压力波传播的系统性认识并揭示其规律。紧密围绕能质输运及转化过程，解决复杂物理场作用下的多相相间互作用及能质输运机理与数理建模等关键科学问题，孕育多相流光热化学物理这一新型交叉学科分支理论。

In this reseach project we will focus on the interactions between or among multiphases and the transport mechanisms of the mass-energy transfer processes of multipase flow for solar photocatalytic hydrogen production under complex multi-physical fields, especially on the mechanism and dynamics of nucleation, bubble formation, motion and development of hydrogen gas bubbles.Based on the electron-hole transfer theory we will build up the mass-energy transfer mechanism model for every key steps in the solar-hydrogen production process and system. The action mechanisms of driving forces and resistances will be revealed and the numerical evaluation model for the mass-energy transfer process of solar photocatalytic hydrogen production will be founded in this project. The multi-field model is introduced in gas-liqud two-phase and multiphase flow calculation. And the change of diameter of the dispersed particles will be modelled by one-group interfacial area concentration transport equation. The closure relationships used in the numerical caculations, for example, the entrainment rate of the dispersed phase, will be studied theoretically and experimentally. And a general three-dimensional thermophysic model of multipahse flow will be established or developed to realize the dynamic prediction of gas-liqud two-pahse flow at a relatively low computational cost, and to analyze the phenomena of the pressure wave or sound wave propagation characteristics with pahse change and to reveal the underlying physical mechanisms. Focusing on the transportations of mass and energy, we will resolve the interphase interactions and transport problems in complex physical fields and develop a new field of photo-thermal-chemical multipahse flow in this project.