汞-水混合工质脉动热管实验研究

在恒定加热功率条件下，考察了不同倾斜角时蒸发段壁面温度的脉动情况，发现了汞-水脉动热管微倾角起振的特性;在相同充液比下，对比了汞-水混合工质与纯水工质脉动热管在微倾角时的运行特性;对比了不同倾斜角下汞-水脉动热管的传热性能。实验结果表明：工质汞的掺入能够有效辅助脉动热管的微倾角起振，增加了脉动热管应用的灵活性。传热热阻随加热功率的增加而减小，而在高加热功率下，热阻大小基本不受倾斜角影响。实验中还发现汞-水脉动热管起振的临界热通量与热载荷施加的历史有关。

Experimental study of pulsating heat pipe with mercury and water as working fluid

Experimental investigation was conducted on closed-loop pulsating heat pipe(CLPHP)working with a mixture of water and mercury.The temperature fluctuation of the evaporator section at different inclination angles was measured at constant heating load,and the phenomenon of start-oscillation in micro inclination angles was observed.Then the operation characteristics of Hg-H2O PHP and pure H2O PHP was compared in the same fill ratio.Lastly,a comparison of heat transfer performance of Hg-H2O PHP with different inclination angles was made.The results showed that the addition of mercury into water effectively assisted the start-oscillation in micro inclination angles which increased the application flexibility of the PHP system.Thermal resistance decreased as heating load increased.Up to a certain magnitude,different inclination angles had very close thermal resistance.It was discovered that the critical heat flux of start-oscillation was related to heating history.