热管等效导热系数的数值模拟

Numerical Simulation on Effective Thermal Conductivity of Heat Pipes

摘要:

为了分析热管简化模型的准确性，采用CFD(Computational Fluid Dynamics)软件Fluent对热管的等效导热系数进行了模拟，在导热系数的三种设定方式下，将简化模型热阻的模拟值与实验值进行了对比，结果表明各向异性模型比各向同性模型具有更高的精度。蒸发段和冷凝段的长度是影响模拟精度的主要因素，当蒸发段和冷凝段长度增大时，简化模型非传热方向上的导热热阻减小，适当减小该方向上的导热系数能更准确地模拟真实热管。

Abstract:

In order to analyze the accuracy of a simplified model of heat pipes, simulations were carried out on effective thermal conductivity of heat pipes with the Fluent CFD(Computational Fluid Dynamics)software. For the three setting methods of thermal conductivity, comparisons of the simulation results with the experimental results show that the anisotropic models tend to be more accurate than the isotropic one. The length of evaporation and condensation sections is the main factor affecting the simulation accuracy. Properly decreasing the thermal conductivity out the direction of heat transfer will better simulate the real heat pipe when the corresponding conductive resistance of simplified model decreases due to the length increase of evaporation and condensation sections.