为了研究脉动热管放置方式对其传热性能的影响，以超纯水作为工质，对水平及倾角为30°放置的脉动热管的传热性能进行研究，用壁面温度振荡性能和传热热阻来描述其传热能力。在不同的放置条件下，着重分析不同加热功率和充液率（35％，50％，70％）对其传热性能的影响。研究表明：水平放置时，充液率为35％和50％时脉动热管不能启动，充液率70％时可以启动运行；脉动热管在运行时存在临界热量输入值，倾角为30°时，临界值为60 W，但水平放置条件下临界值为90 W；水平放置下的脉动热管传热热阻在不同加热功率下，显著高于倾角为30°的情况；倾角为30°，充液率为35％时的脉动热管适合在低加热功率范围运行，此时传热热阻要低于充液率为50%的情况，但传热范围很窄，传热极限低；30°倾角时，与充液率35%和50%相比，高充液率70%的脉动热管整体传热性能最优。

In order to study the influence of pulsating heat pipe (PHP) placement mode on the its heat transfer performance,taking the ultrapure water as working fluid,the heat transfer performance of PHP arranged in the horizontal position and the inclination angle of 30° was studied in this paper.The heat transfer performance is described by wall temperature oscillating performance and heat transfer resistance.Under different placement modes,and the effects of different heat power and filling ratios of 35%,50% and 70% on its heat transfer performance were emphatically analyzed.The research results show that PHP with lower filling ratios of 35% and 50% can′t start up in the horizontal position,but it can start up and operate normally with the filling ratio of 70%.There is a critical value of heat input for the pulsating heat pipe in operation,and the critical value is 60 W at the inclination angle of 30° and 90 W in the horizontal position.And it is found that the heat transfer resistance of PHP in the horizontal position at different heat power is significantly higher than that of PHP at 30°inclination angle.The PHP at 30° inclination angle and with 35% filling ratio is available to operate at lower heat power,and its heat transfer resistance is lower than that of PHP with 50% filling ratio,but the disadvantages are the narrow range and the low limit of heat transfer.And the overall heat transfer performance of PHP at 30° inclination angle and with 70% filling ratio is optimal,compared with 35% and 50% filling ratios.

TK172.4

国家自然科学基金（52000008），北京建筑大学市属高校基本科研业务费专项资金（X20058）