重力对树状肋相变储热换热器性能影响的数值研究

The Influence of Gravity on the Performance of Tree-Ribbed Phase Change Heat Storage Heat Exchangers Numerical Research

摘要: 为了揭示重力对树状肋相变储热换热器性能的影响，本文选择月桂酸作为相变材料，肋片的材料取铝合金6061，建立了相变传热数值计算模型，对相变储热器的温度变化、相变界面变化进行瞬时研究。分析了树状肋结构储热换热器的传热规律及重力加速度对储热单元的换热效果的影响。结果表明，肋片的加入对相变传热的影响显著，肋片强化了系统内部的传热过程，进而控制相界面的分布及演化过程。重力加速度对自然对流强度具有决定性的影响，重力加速度较大时能够有效强化热量传递，提升相变材料的相变速率，提升相变储热器的储放热速率。通过本文研究为空间相变储热器的研究提供了理论指导。

Abstract: To reveal the influence of gravity on the performance of tree-ribbed phase change heat storage heat exchangers, lauric acid was selected as the phase change material in this paper, and aluminum alloy 6061 was chosen as the material for the ribs. A numerical calculation model for phase change heat transfer was established, and the temperature changes and phase change interface changes of the phase change heat storage were studied instantaneously. The heat transfer law of the tree-ribbed structure heat storage heat exchanger and the influence of gravitational acceleration on the heat exchange effect of the heat storage unit were analyzed. The results show that the addition of fins has a significant impact on phase change heat transfer. Fins enhance the heat transfer process within the system, thereby controlling the distribution and evolution process of the phase interface. The acceleration due to gravity has a decisive influence on the intensity of natural convection. When the acceleration due to gravity is large, it can effectively enhance heat transfer, increase the phase change rate of phase change materials, and improve the heat storage and release rate of phase change heat storage devices. This paper provides theoretical guidance for the research on space phase change heat storage devices.