关键词: 相变材料微胶囊, 力学性能, 纳米压痕法, 显微操作法, 破损率

Abstract: When microencapsulated phase change materials (MicroPCM) slurry is used as heat transfer fluid, the slurry has smaller temperature difference of heat transfer, higher heat carrier density, shorter heat storage/release time than common heat transfer fluid. However, during research and practical application, MicroPCM particles may be severely deformed, sunk or even damaged after a certain number of pumping cycles, which further causes PCM leakage, coalescence, sticky wall, clogging pipes and other consequences, and thus, leads to a significant deterioration in slurry performance. To make this slurry have more stable performance and longer cycle life, some experimental and theoretical researches, on both the mechanical properties of MicroPCM themselves and their circulation flow stability in slurry, are carried out at home and abroad. In this paper, related research progresses are reviewed. It is believed that the mechanical properties of MicroPCM themselves and the pumping effects are the intrinsic and external factors of circulation flow stability respectively. This paper also summarizes problems that exist in both aspects and puts forward that relevant researches should be implemented to develop standardized testing and characterization methods, to expand the scope of research object, to take full advantage of numerical simulation technology.

Key words: microencapsulated phase change materials, mechanical properties, nanoindentation method, micromanipulation method, breakage rate