Experimental and numerical investigation of phase change progress for paraffin in hybrid aerogel of graphene and carbon nanotubes
Experimental and numerical investigation of phase change progress for paraffin in hybrid aerogel of graphene and carbon nanotubes
复制标题
石墨烯和碳纳米管杂化气凝胶中石蜡相变过程的实验和数值研究
DOI：
10.1016/j.applthermaleng.2020.115633
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发表时间：
2020-09
影响因子：
6.4
通讯作者：
Zhang Kai
中科院分区：
文献类型：
--
作者：
Feng Zhicheng;Yang Wenbin;Liu Xu;He Fangfang;Li Yongsheng;Zhou Yuanlin;Fan Jinghui;Zhang Kai
本文通过数值模拟研究了石蜡填充石墨烯/碳纳米管杂化气凝胶的相变过程。采用体积平均法和热平衡方程对熔化凝固过程进行了数值模拟。实验温度-时间曲线与模拟温度-时间曲线趋势具有较好的一致性。石墨烯气凝胶(GA)中石蜡的相变过程比石墨烯-碳纳米管气凝胶(GCA)中的石蜡相变过程慢得多。当石蜡/GCA(PGCA)相变复合材料的有效导热系数相差不大时，局部换热主要与有效导热系数有关。但孔隙率对整体换热影响较大。孔隙率越低，GCA骨架含量越高，石蜡含量越少。一方面，GCA骨架与石蜡的充分接触促进了传热。另一方面，石蜡相变潜热的降低使相变过程中的温度快速上升或下降。模拟结果表明，不同有效导热系数和孔隙率的GCA骨架的换热性能存在差异，可用于温度管理和加速换热。
In this work, the phase change progress of paraffin filled hybrid aerogel of graphene and carbon nanotubes was investigated by numerical simulation. Volume averaging method and thermal equilibrium equation were used to simulate melting and solidification process. The trend of experimental and simulated temperature–time curves had good consistency. The phase change process of paraffin in graphene aerogel (GA) was much slower than that in graphene-carbon nanotubes aerogel (GCA). When the effective thermal conductivity of paraffin/GCA (PGCA) phase change composites was not significantly different, the local heat transfer mainly related to the effective thermal conductivity. However, the overall heat transfer was greatly affected by porosity. Low porosity indicated more content of GCA skeleton and less paraffin. On one hand, sufficient contact between GCA skeleton and paraffin promoted heat transfer. On the other hand, the decrease of latent heat energy of paraffin made temperature rise or fall rapidly during phase change process. The simulation results demonstrated the discrepancies in the heat transfer performance of GCA skeleton with different effective thermal conductivity and porosity, which can be applied to temperature management and accelerated heat transfer.
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