超细粉体在增强复合材料性能上具有显著的作用，其在基体中的分散状态直接影响最终制品的性能。然而超细粉体极易团聚且在高粘度流体中难以均匀分布，这给高性能复合材料的制备提出了新的挑战。为此，本项目探索采用高强度声频振动及其通过声振耦合在流体域内衍生声波的协同作用来促进超细粉体在高粘度流体中均匀分散。首先，研究高强度声频振动下流体域中流场、声场和温度场等的时空分布规律和能量传递过程，以及超细粉体团聚破解的动力学行为。其次，从宏观和微观尺度分别揭示声振激励下颗粒间以及颗粒与流体间的作用规律，阐明高粘度流体中超细粉体团聚破解和均匀分布的声频振动作用机制。进而研究频率、振幅和振型等激励参数以及粒径、固含量和粘度等物性参数对超细粉体在高粘度流体中分散过程的影响规律，提出分散过程强化方法。本项目的实施对于发展高粘度流体中超细粉体分散理论、指导分散装备的设计和工艺优化以及促进高性能复合材料开发具有重要的意义。

The incorporation of superfine powders into basic materials has obvious effects on enhancing the performances of composite materials. The dispersion states of superfine powders affect the final product performances directly. However, the superfine powders aggregate easily and they are hard to distribute uniformly in high viscosity fluids, which brings challenges to the preparation of high performance composite materials. In this study, the synergic effects of high intensity acoustic vibrations and acoustic waves which are derived by acoustic-vibration coupling in the fluid domain are proposed to promote the uniform distribution of superfine powders in high viscosity fluids. Firstly, the distribution of flow field, acoustic field, and temperature field in fluid domain, energy transfer process, and the cracks dynamic behaviors of superfine powders will be studied. The interactions within particles and those between particles and the fluids under the acoustic-vibration excitation will also be studied from macro-to-micro scales. Then the acoustic-vibration mechanism of cracking and uniformly distributing superfine powders in high viscosity fluids will be clarified. The effects of excitation parameters such as frequency, amplitude and vibration mode and physical parameters such as diameter, solid content, and viscosity to the superfine powders dispersion process in high viscosity fluids will be studied and the process intensification method will be proposed finally. This study has great significances in developing the theory of superfine powders dispersion in high viscosity fluids, guiding the design of dispersion equipment and process optimization, and further promoting the development of high performance composite materials.