Enhanced thermal properties of ternary chloride composites for thermal energy storage: Insights from molecular simulation

As a promising phase change material, molten salt has been used extensively for thermal energy storage. It is important to explore the microstructure change in the working temperature range to improve thermal properties of molten salt. In this study, the molecular dynamics simulation method was empl...

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Veröffentlicht in:International communications in heat and mass transfer 2024-12, Vol.159, p.108221, Article 108221
Hauptverfasser: Tian, Heqing, Zhang, Wenguang, Kou, Zhaoyang, Guo, Chaxiu, Yu, Yinsheng, Zhou, Junjie
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Sprache:eng
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Zusammenfassung:As a promising phase change material, molten salt has been used extensively for thermal energy storage. It is important to explore the microstructure change in the working temperature range to improve thermal properties of molten salt. In this study, the molecular dynamics simulation method was employed to examine how SiO2 and Al2O3 nanoparticles enhance the thermal properties of NaCl-KCl-MgCl2 molten salts. The results indicate that both SiO2 and Al2O3 nanoparticles have enhanced the thermal properties of NaCl-KCl-MgCl2 salt. Al2O3 nanoparticles exhibit a more significant enhancement in the density and specific heat capacity of pure salt, increasing them by 4.22 % and 4.18 %, respectively. However, SiO2 nanoparticles have a larger enhancement effect on the viscosity and thermal conductivity of molten salt, with increases of 63.88 % and 9.33 % respectively at 870 K. The nanoparticles adjust the viscosity of molten salt by modifying the distance between cations and anions, as well as the diffusion capability of system. Additionally, they regulate the thermal conductivity and specific heat capacity of molten salt by forming compressed interface layer.
ISSN:0735-1933
DOI:10.1016/j.icheatmasstransfer.2024.108221