基于热阻网络法的热管导热性能分析

Analysis of Heat Conduction Performance of Heat Pipe Based on Thermal Resistance Network Method

为了获得热管温度、传输功率等导热特性,基于热阻等效理论建立了考虑蒸汽腔区域传热的二维热管热阻网络模型,获得了热管瞬态及稳态传热性能,并与文献及本文实验数据进行了对比验证,其绝热段平均温度最大相对误差为7.6%。研究结果表明,模型对文献钠工质热管及本文水工质热管实验数据具有较高的计算精度;热管轴向各段温度均匀性较好,吸液芯径向热阻是热管导热热阻的主要影响因素;热管工作温度与传输功率随冷源参数变化趋势相反,热管传输热量是一个自适应的动态调节过程。因此,热阻网络模型可以作为实验分析和热管设计的工具,同时还可以进一步扩大工况研究范围,获得边界条件对热管传热过程的影响规律,进一步为多应用场景下热管设计提供参考。

In order to obtain the heat conduction characteristics such as heat pipe temperature and transmission power,a 2D heat pipe thermal resistance network model considering steam cavity heat transfer is established based on the thermal resistance equivalence theory,and the transient and steady-state heat transfer performance of the heat pipe are obtained.The literature and the experimental data of this paper are compared and verified.The maximum relative error of the average temperature in the adiabatic section is 7.6%.The results show that the model has a high accuracy for the experimental data of sodium working medium heat pipe in literature and hydraulic working medium heat pipe in this paper;The temperature uniformity of each axial section of the heat pipe is good,and the radial thermal resistance of the wick is the main factor affecting the thermal-conduction resistance of the heat pipe;The working temperature and transmission power of the heat pipe change with the cold source parameters in the opposite trend,and the heat transfer of the heat pipe is an adaptive dynamic regulation process.Therefore,the thermal resistance network model can be used as a tool for experimental analysis and heat pipe design.At the same time,it can further expand the research scope of working conditions,obtain the influence rules of boundary conditions on heat pipe heat transfer process,and further provide reference for heat pipe design in multiple application scenarios.