两相闭式热虹吸管传热机理模拟研究

Simulation study on heat transfer mechanism of two-phase closed thermosyphon

为了研究两相闭式热虹吸管影响因素的传热机理,建立了两相闭式热虹吸管的物理模型并进行了数值求解分析。通过研究分析热流密度、倾角及工质对两相闭式热虹吸管换热性能的影响,得到了不同工况下蒸发段相体积分数云图、内部换热系数曲线图及温度场。结果表明:冷凝段的换热机理为相变膜状冷凝,蒸发段换热机理为沸腾换热;工质的种类对热管性能的影响很大,热管在运行中存在换热性能最佳的状况;各因素影响热管换热效率的主要机理是气泡的行为。

In order to study the heat transfer mechanism of two-phase closed thermosyphon, the physical model of two-phase closed thermosyphon was established and calculated by numerical analysis. The effects of heat flux, dip angle and working fluid on the heat transfer performance of two-phase closed thermosyphon were studied, and the evaporation phase volume fraction cloud chart, the internal heat transfer coefficient curve and temperature field under different conditions were obtained.. The results show that, the heat transfer mechanism of the condensation is the phase change film condensation and the evaporation section is boiling heat transfer. The working fluid has a great influence on the performance of the thermosyphon, and the optimal heat transfer performance exists in the heat pipes. Moreover, the main mechanism for each factor affecting the heat transfer efficiency is the behavior of the bubbles.