超薄热管启动特性和传热性能数值模拟  

Numerical simulation of start-up characteristics and heat transfer performance of ultra-thin heat pipe

作　　者：史方哲 甘云华[1] SHI Fangzhe;GAN Yunhua(School of Electric Power Engineering,South China University of Technology,Guangzhou 510641,Guangdong,China)

机构地区：[1]华南理工大学电力学院,广东广州510641

出　　处：《化工学报》2023年第7期2814-2823,F0002,共11页CIESC Journal

基　　金：广东省省级科技计划项目(2022A0505050004);广州市科技计划项目(2023B03J1282);广东省基础与应用基础研究基金项目(2020B1515020040)。

摘　　要：提出了一种简化的超薄热管三维瞬态模型,模拟热管由启动至稳定运行的过程,基于团队前期工作验证了模型的准确性,通过数值模拟研究了不同流道厚度、吸液芯类型及折弯段几何结构的热管,分析了各参数对蒸汽流动特性、温度分布特性及启动性能的影响,基于控制理论对不同结构热管的热响应特性进行了定量分析,最大均方根误差(RMSE)仅为0.385。研究表明:流道厚度过小将增大蒸汽流动阻力和能量损失,不同结构吸液芯主要通过蒸汽通道宽度差异影响蒸汽流动特性,流道厚度越小越易受折弯段折弯半径和折弯角度的影响。此外,流道厚度小于0.2 mm还将影响热管均温性,使气液循环受限,热管总热阻和启动时间主要受热负荷的影响。In this paper,a simplified three-dimensional transient model of ultra-thin heat pipe was proposed to simulate the process of heat pipe from start-up to stable operation.Based on the previous work of the team,the accuracy of the model was verified.Heat pipes with different vapor core thicknesses,types of wicks and bending section geometry were studied by numerical simulation.The influence of different parameters on the vapor flow characteristics,temperature distribution and start-up performance is analyzed.Based on the control theory,the thermal response characteristics of heat pipes with different structures are quantitatively analyzed.The maximum RMSE is only 0.385.The results show that the flow resistance and energy loss of vapor will increase if the vapor core thickness is too small.Different structures of wicks mainly affect the steam flow characteristics through the difference in the width of the steam channel.The smaller the vapor core thickness is,the more easily it is affected by the bending radius and bending angle of the bending section.In addition,if the thickness of the flow channel is less than 0.2 mm,it will also affect the temperature uniformity of the heat pipe and limit the vapor-liquid circulation.The total thermal resistance and start-up time of the heat pipe are mainly affected by the heat load.

关 键 词：超薄热管 数值模拟 相变 传热 启动性能 

分 类 号：TK172.4[动力工程及工程热物理—热能工程]