Abstract In the current study, free convection heat transfer of a suspension of Nano–Encapsulated Phase Change Materials (NEPCMs) is simulated and discussed in an inclined porous cavity. The phase change materials are capsulated in nano-shells layers, while the core stores/releases large amounts of energy during melting/solidification in the vicinity of the hot/cold walls. The governing equations are introduced and transformed into non–dimensional form before being solved by using the finite element method. Simulation results are validated thoroughly. Thereafter, the consequences of the fusion temperature and the Stefan number on the distributions of streamlines, isotherms, and the heat capacity ratio, as well as the heat transfer characteristics, are analyzed for different inclination angles of the cavity. Inspection of the results demonstrates that the best heat transfer performance occurs for the non–dimensional fusion temperature of 0.5 and the inclination angle of 42°. It is found that a decrease in the Stefan number improves heat transfer. The results also show that the presence of the NEPCM particles generally leads to heat transfer improvement.

中文翻译：

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纳米封装相变材料 (NEPCMs) 在倾斜多孔腔中悬浮液的自由对流传热分析

摘要 在当前的研究中，纳米封装相变材料 (NEPCMs) 悬浮液在倾斜多孔腔中的自由对流热传递进行了模拟和讨论。相变材料被封装在纳米壳层中，而核心在热/冷壁附近的熔化/凝固过程中储存/释放大量能量。在使用有限元方法求解之前，将控制方程引入并转化为无量纲形式。仿真结果得到彻底验证。此后，分析了熔化温度和Stefan数对流线分布、等温线分布、热容比以及传热特性的影响，针对腔体的不同倾角。检查结果表明，最佳的传热性能出现在 0.5 的无量纲熔化温度和 42°的倾角。发现斯蒂芬数的减少改善了传热。结果还表明，NEPCM 颗粒的存在通常会导致传热改进。