Presentation time: 10:00-11:00, November 26, 2022 (Saturday)
Report form: wechat video live: search "School of Mechanical Engineering, Yanshan University"
Speaker: LI Zhiwei
Li Zhiwei is a lecturer and postgraduate tutor in the School of Mechanical Engineering, Yanshan University. PhD graduated from Polytechnic University of Milan, Italy, mainly engaged in the research of heat transfer mechanism of composite phase change energy storage materials. To undertake one undergraduate course "Robotics". Presided over one Chunhui Talent Project of Hebei Natural Science Foundation. He has published 8 SCI papers and 1 conference paper, including 5 first authors and 2 SCI+TOP journal papers in the first District.
Solid-liquid phase change energy storage materials can use solid-liquid phase change to achieve constant temperature energy storage or energy release, which has the advantages of improving resource utilization, energy saving and environmental protection, and has broad application prospects in the fields of solar thermal utilization and building insulation. However, the low thermal conductivity of phase change materials is a bottleneck problem that restricts their application. This report focuses on the study of phase change heat transfer enhancement, using porous metal materials with high thermal conductivity and designability characteristics to design porous matrix composite phase change materials, the calculation model of phase change material-paraffin thermophysical properties was established, and the thermal conductivity regulation mechanism of porous matrix composite phase change materials with synergistic effect of thermal conductivity ratio and porosity was revealed. At the same time, a multi-scale numerical model of heat transfer with phase change materials as the core is established, and the effective application range of the macro-scale model in simulating heat conduction process is determined. According to the Rayley-Darcy number, a simplified mathematical model is derived to determine whether there is convective motion in the parafin-metal foam composite phase change materials. The regulation mechanism of the thermal properties, porous structure characteristics and heat source position on the heat transfer characteristics of the porous composite phase change materials is revealed, which provides a theoretical basis for the design and performance improvement of phase change energy storage materials.
School of Mechanical Engineering
25 November 2022
