Preparation and properties of paraffin-based phase change materials with different magnetically regulated Fe3O4 arrangement
The composite phase change material(PCM)was prepared by using paraffin as substrate and self-made Fe3O4 nanoparticles as thermal conductive nano-filler.In order to investigate the effect of nano-filler ar-rangement on the thermal conductivity of PCM,the composite PCM with different characteristics of nano-filler arrangement was prepared under the control of magnetic field.The chemical structure and microstructure of Fe3O4 nanoparticles and PCM composites were characterized by XRD,FTIR and SEM,and the thermal proper-ties of PCM composites were measured.The arrangement of nano-filler was observed by image measuring in-strument.According to the actual arrangement which were displayed by image measuring instrument and EDS,the finite element model of PCM with different arrangement of nano-fillers was constructed.The influence of different arrangements of nano-fillers on the thermal conductivity of PCM was calculated as well.The results show that the size of Fe3O4 nanoparticles is 40-50 nm,and their magnetic response performance is excellent.The phase change temperature is small,and the phase change latent heat is in the range of 134.3-148.1 J/g.The higher the height and the larger the area of the"mountain"arrangement region formed by the nano-fillers,the greater the thermal conductivity of the composite PCM.The thermal conductivity has been increased by up to 34％.Moreover,the finite element simulation explored the temperature field of the heat transfer process and further verified that the thermal conductivity of the phase change composites can be improved by optimizing the distribution of Fe3O4 nanofillers.
phase changenanoparticlesfiller arrangementmagnetic regulationheat conductionfinite element simulation
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