姜 峰 ,景文玥 ,齐国鹏 ,沈 宇,李修伦
AuthorsHTML:姜 峰 ¹ ，景文玥 ¹ ，齐国鹏 ² ，沈 宇 ¹ ，李修伦 ¹
AuthorsListE:Jiang Feng,Jing Wenyue,Qi Guopeng ,Shen Yu,Li Xiulun
AuthorsHTMLE:Jiang Feng¹，Jing Wenyue ¹，Qi Guopeng ²，Shen Yu¹，Li Xiulun¹
Unit:1. 天津大学化工学院，天津 300072；
2. 天津职业大学生物与环境工程学院，天津 300410

Unit_EngLish:1. School of Chemical Engineering and Technology，Tianjin University，Tianjin 300072，China；
2. School of Biological and Environmental Engineering，Tianjin Vocational Institute，Tianjin 300410，China

Abstract_Chinese:三相闭式重力热管将流化床换热防垢节能技术和闭式重力热管相结合，操作简便，具有明显的强化传热效 果．为深入、全面地考察三相闭式重力热管的传热性能，设计并构建了一套蒸发段可变的三相闭式重力热管．选用玻 璃珠颗粒和水作为实验工质，通过改变加热功率、固含率和颗粒粒径等操作参数，分析了蒸发段长度对三相闭式重 力热管传热性能的影响．结果表明：在不同的蒸发段长度下，玻璃珠颗粒的加入均可以在一定的条件下强化传热， 但其强化传热效果不仅受固含率、加热功率和颗粒粒径等操作参数的影响，而且与蒸发段的长度密切相关．对于实 验中 3 种不同的蒸发段长度，总热阻的最大减少率分别为 16.5%、25.4%、13.5%．随着蒸发段长度的增加，三相闭式 重力热管的总热阻减小．在不同的蒸发段长度下，总热阻随着颗粒粒径的变化规律有所差异，并且受固含率和加热 功率等操作参数的影响．从强化传热的角度考虑，三相闭式重力热管蒸发段的长度应适中，所采用的玻璃珠颗粒粒 径不宜过小．研究中构建了不同的蒸发段设置下，操作参数对三相闭式重力热管传热性能影响的三维图和总热阻经 验关联式，以用于指导工业实践．模型数据与实验结果吻合较好．研究结果对于三相闭式重力热管的工业应用具有 一定的指导意义．
Abstract_English:By combining fluidized bed heat transfer technology with a closed thermosyphon，the resulting three-phase closed thermosyphon can significantly enhance the heat transfer with a simple operation. In this study，we designed and built a three-phase closed thermosyphon with a variable evaporation section to investigate its heat transfer performance. Pure water and glass beads were used as the working media. To analyze the effects of the length of the evaporation section on the heat transfer performance of the three-phase closed thermosyphon，we varied the operating parameters，including the heat input，solid holdup，and particle size. The results show that the addition of glass bead particles can enhance the heat transfer of the closed thermosyphon under different evaporation-section settings in certain conditions. In addition，the heat transfer effect is not only affected by these three operating parameters，but is also closely related to settings of the evaporation section. The maximum reduction rates of the total thermal resistance were 16.5%，25.4%，13.5% for the different evaporation section settings used in the experiments. The total thermal resistance of the three-phase closed thermosyphon decreased with increases in the length of the evaporation section. The variation trends of the total thermal resistance differed with particle size at different evaporation section lengths， depending on the solid holdup and heat input. To enhance the heat transfer，the length of the evaporation section ofthe three-phase closed thermosyphon should be moderate and the glass beads should not be too small. Based on three-dimensional diagrams of the thermal performance，we establish correlations for the overall thermal resistance. The model results agree well with the experimental data. These findings are beneficial for the industrial application of the three-phase closed thermosyphon.
Keyword_Chinese:三相闭式重力热管；强化传热；流化床换热；可变的蒸发段；玻璃珠；颗粒粒径
Keywords_English:three-phase closed thermosyphon；heat transfer enhancement；fluidized bed heat transfer；variable evaporation section；glass bead；particle size

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