振荡热管当量导热系数数值模拟与试验研究

Investigation on Effective Thermal Conductivity of Oscillating Heat Pipes by Numerical Simulation and Experiments

提出了利用求解导热反问题的方法来测量振荡热管的当量导热系数。首先利用试验手段测得振荡热管上某些点的温度及其随时间的变化,然后通过模型数值计算得到选取点温度的模拟值,最后通过比较试验值和模拟值求得了振荡热管的当量导热系数。以铜-水闭合回路振荡热管作为研究对象,利用电加热和自然对流冷却,采用红外热像仪测量振荡热管的温度场。数值建模在Thermal Desktop软件中完成,除了考虑自然对流散热外,还考虑了辐射散热以及保温层的热损失。在给定试验条件下得到振荡热管的当量导热系数为65000 W/(m.℃)。

A method of solving inverse problem was presented that is different from traditional calculation method to investigate the effective thermal conductivity of oscillating heat pipes （OHPs）. First,the wall temperature of an OHP was measured experimentally. Second,the model was created in thermal analysis software or though numerical method such as FDM and FEM. Finally, the effective thermal conductivity was acquired by comparing the experimental results and simulation results. In the given example,a copper-water OHP was heated by DC power supply and cooled by air free convection. Thermal camera was used to capture the temperature field of the working OHP. In the numerical modeling, the radiation transfer and heat loss from insulation lay- er was considered besides air free convection. Under the given conditions, the effective conductivity of the OHP is about 65 000 W/（m·℃）.