Abstract
The ice thermal storage performance would be enhanced by nano-additives to improve thermal conductivity and reduce supercooling degree of water. In this work, the solidification heat transfer characteristics of the magnetic Multi-walled Carbon Nanotube (MWCNT) Phase Change Material (PCM) under the applied magnetic field were investigated numerically. The supercooling degree was considered by dividing the whole solidification process into two stages of supercooling and phase change regions in the simulation model. Furthermore, the simulation results were verified by the experimental data. Specifically, the temperature distribution influenced by MWCNT under magnetic field and the development features of convection in the supercooling region were discussed. The results indicated that the solidification characteristics were enhanced by adding magnetic MWCNT, and the heat transfer was further enhanced with the aligned MWCNT under extra applied magnetic field. Consequently, the stable flow field was advanced by 37 %, the time of vortices distribution was reduced by 69.4 % for MWCNT PCM under magnetic field. Besides, there was 68.6 % reduction in supercooling, 76.6 % shorten in nucleation time and 36.2 % shorten in total solidification time compared to pure water.
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