Metamaterials for Mechanical, Biomechanical and Multiphysical Applications Research Group, Ton Duc Thang University, Ho Chi Minh City 758307, Vietnam.
Faculty of Applied Sciences, Ton Duc Thang University, Ho Chi Minh City 758307, Vietnam.
Molecules. 2021 Mar 9;26(5):1496. doi: 10.3390/molecules26051496.
A wavy shape was used to enhance the thermal heat transfer in a shell-tube latent heat thermal energy storage (LHTES) unit. The thermal storage unit was filled with CuO-coconut oil nano-enhanced phase change material (NePCM). The enthalpy-porosity approach was employed to model the phase change heat transfer in the presence of natural convection effects in the molten NePCM. The finite element method was applied to integrate the governing equations for fluid motion and phase change heat transfer. The impact of wave amplitude and wave number of the heated tube, as well as the volume concertation of nanoparticles on the full-charging time of the LHTES unit, was addressed. The Taguchi optimization method was used to find an optimum design of the LHTES unit. The results showed that an increase in the volume fraction of nanoparticles reduces the charging time. Moreover, the waviness of the tube resists the natural convection flow circulation in the phase change domain and could increase the charging time.
采用波形结构来增强壳管式潜热蓄热（LHTES）单元中的热传递。该蓄热单元填充了氧化铜-椰子油纳米增强相变材料（NePCM）。在熔融 NePCM 中存在自然对流效应的情况下，采用焓-孔隙法来模拟相变传热。应用有限元法来整合流体运动和相变传热的控制方程。研究了加热管的波幅和波数以及纳米颗粒的体积浓度对 LHTES 单元完全充电时间的影响。采用田口优化方法来寻找 LHTES 单元的最佳设计。结果表明，纳米颗粒的体积分数的增加会缩短充电时间。此外，管的波纹结构可以抵抗相变区域中的自然对流循环，从而延长充电时间。
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