不同加热功率条件下钠钾合金热管启动和传热性能

以钠钾合金（NaK-55）为工质进行实验，分别在800、1000、1200、1400、1600W的加热功率条件下对钠钾合金热管的启动和传热性能进行研究。实验结果表明:在800~1600W加热功率范围内，在冷却水冷却条件下，该钠钾合金热管可以完全启动并进入稳定工作状态。随着加热功率的提高，热管外壁面温度整体略有增加，冷凝段启动时间缩短，钠钾合金热管的当量传热系数、蒸发区表面传热系数、冷凝区表面传热系数随加热功率的提高成线性增加。 

Start-up and heat transfer performance of a sodium-potassium alloy heat pipe under different conditions of heating power

A sodium-potassium ally (45-wt.%-Na and 55-wt.%-K) heat pipe was experimentally tested to investigate the effect of heating powers (800, 1000, 1200, 1400, and 1600W) on start-up and heat transfer performances. The results showed that under the tested operation conditions, the sodium-potassium ally heat pipe presented an optimal start-up performance with the heating power. Within the range of 800-1600W of heating power, the heat pipe could achieve a dynamic equilibrium state of heat transfer as the heat was carried away by cooling water in time, and the heat transfer coefficient of the sodium-potassium ally heat pipe, convective heat transfer coefficients of evaporator and condenser sections almost linearly increased with the heating power.