蒸发段长度对钠钾合金热管启动性能影响

Effect of the Evaporator Length on Start-up Performance of Sodium-Potassium alloy Heat Pipe

启动特性是衡量热管可靠性的重要指标。重力热管启动特性受工作角度、蒸发段与冷凝段长度等因素的影响。本文研究了蒸发段长度和冷凝段长度对钠钾合金重力热管启动特性的影响。实验测得变蒸发段和冷凝段长度时,钠钾合金热管的外壁面温度分布曲线。研究表明,增加蒸发段长度利于热管外壁面温度分布趋于均匀,但沿热管蒸发段轴向液池区域范围内仍存在一定的温差。

The start-up performance is an important indicator to measure the reliability of heat pipes. The factors, such as the operating angles, evaporator section and condenser section length, affect the start-up characteristic of the thermosiphon. In this study, impacts of the evaporator section and condenser section length on start-up characteristic of a sodium-potassium （Na-K） alloy heat pipe was experimentally investigated. Outside wall temperature distributions of the Na-K alloy heat pipe operating in different length of the evaporator section and condenser section were measured. The results showed that it is beneficial to a uniform temperature distribution to increase the evaporator section length. However, an axial temperature difference was still existed in the region of the liquid pool, placed in the bottom of the evaporator section.