| 一种新型环路重力热管的数值模拟和性能优化 |
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| 引用本文： | 陈建勋,刘金平,许雄文,余银豪.一种新型环路重力热管的数值模拟和性能优化[J].化工学报,2023,74(2):721-734. |
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| 作者姓名： | 陈建勋 刘金平 许雄文 余银豪 |
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| 作者单位： | 1.华南理工大学电力学院，广东 广州 510640;2.华南理工大学广东省高效清洁能源利用重点实验室，广东 广州 510640;3.华南理工大学亚热带建筑科学国家重点实验室，广东 广州 510640 |
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| 基金项目： | 国家自然科学基金项目(51976063);广东省自然科学基金项目(2019A1515011253) |
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| 摘 要： | 研究了一种新型的环路重力热管(LGHP)，并提出一种基于VOF方法的简化两相流数值模型，能够有效地模拟热管蒸发器内部气泡的产生和干涸区的位置，从而研究蒸发器内部工质的流动特性。在数值模拟的基础上改进了蒸发器的流道结构，以延缓水平放置时蒸发器干涸区的出现。通过实验验证发现改进后蒸发器的传热性能得到了很大的提高，蒸发器中制冷剂的液相积存量得以提升，使其极限热通量(CHF)提高到140 kW/m2(加热功率2000.7 W)，为改进前CHF的两倍。证明该简化模型在模拟干涸区位置方面具有准确性，可以为进一步的设计和改进平板蒸发器流道结构提供参考。
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| 关 键 词： | 环路重力热管 极限热通量 干涸区 池沸腾 |
| 收稿时间： | 2022-11-23 |
Numerical simulation and performance optimization of a new loop gravity heat pipe |
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| Jianxun CHEN,Jinping LIU,Xiongwen XU,Yinhao YU.Numerical simulation and performance optimization of a new loop gravity heat pipe[J].Journal of Chemical Industry and Engineering(China),2023,74(2):721-734. |
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| Authors: | Jianxun CHEN Jinping LIU Xiongwen XU Yinhao YU |
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| Affiliation: | 1.School of Electric Power, South China University of Technology, Guangzhou 510640, Guangdong, China;2.Guangdong Province Key Laboratory of Efficient and Clean Energy Utilization, South China University of Technology, Guangzhou 510640, Guangdong, China;3.State Key Laboratory of Subtropical Building Science, South China University of Technology, Guangzhou 510640, Guangdong, China |
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| Abstract: | A new loop gravity heat pipe (LGHP) is researched and a simplified two-phase flow numerical model based on VOF method is proposed to study the flow characteristics of the working fluid in the evaporator, which can effectively simulate the generation of bubbles and the location of the dry area in the evaporator of LGHP. Based on the numerical simulation, the channel structure of the evaporator is improved to delay the appearance of the dry zone of the evaporator when it is placed horizontally. Through experimental verification, it is found that the heat transfer performance of the improved evaporator has been greatly improved, and the liquid phase storage capacity of the refrigerant in the evaporator has been improved, which double its critical heat flux (CHF) to 140 kW/m2 (heating power 2000.7 W). It is proved that the simplified model is accurate in simulating the location of the dry area, and can provide a reference for further design and improvement of the flow channel structure of the flat evaporator. |
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| Keywords: | loop gravity-assisted heat pipe critical heat flux dry area pool boiling |
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