Performance study for new type of three-dimensional pulsating heat pipe

doi:10.16085/j.issn.1000-6613.2016.08.10

Abstract

Abstract: A new three dimensional pulsating heat pipe was formed by improving traditional pulsating heat pipe cooling segment into a double helix structure. An experimental platform of a new three-dimensional pulsating heat pipe was established. In this paper,the influence for the start performance and heat transfer performance of the new type of three-dimensional pulsating heat pipe at various heating powers (20W to 700W)and various inclination angles(0°,50°,90°) were investigated. Acetone was used as working fluid with 54% fill ratio. The temperature of cooling water was 22℃. The start running features of pulsating heat pipe by temperature changes at heating period and cooling period were judged. Heat transfer effect of heat pipe by total thermal resistance was evaluated. Experimental results showed that the pulsating heat pipe could start up at 0°,50°and 90°. It was more conducive for the new type of pulsating heat pipe to start up and operate stably at 90°. At angle 90°,pulsating heat pipe started up at heat power 40W. Stable operation status at 100W as well as heat transfer limit at 700W were achieved. The tendency of the thermal resistance decreased first and then increased. The minimum heat resistance could reach 0.117℃/W. There was no significant difference for the heat resistance of pulsating heat pipe between the angle 90°and 50°. But at angle 0°,in the whole progress,it was easy to achieve heat transfer limit and the thermal resistance was much higher than that of 50°and 90°. Heat limit at 180W was achieved.

Key words: pulsating heat pipe, thermal resistance, heat transfer, gasification, transport, inclination angle

摘要： 把传统脉动热管冷却段改进成双螺旋结构，形成新型三维脉动热管，并建立实验平台，考察了以丙酮为工质，在充液率54%、冷却水温度22℃的条件下，不同加热功率（20~700W）、不同倾斜角度（0°、50°、90°）对新型三维脉动热管的启动以及传热性能的影响，通过加热段以及冷却段管壁温度变化判断脉动热管启动运行特性，通过总热阻评价热管传热效果。实验结果表明，脉动热管在0°、50°和90°倾斜角度下均可以启动，但90°倾斜角时更有利于新型脉动热管的启动和稳定运行。90°倾斜角时，脉动热管在加热功率40W时启动，100W达到稳定运行状态，700W时到达传热极限，脉动热管的总热阻呈现先减小后增大的趋势，总热阻最小可达0.117℃/W。脉动热管在90°和50°倾斜角度下传热总热阻没有明显差异，但在0°倾斜角时，极易达到传热极限且在整个过程中热阻要比50°和90°倾斜角条件下高很多，加热功率180W达传热极限。

关键词: 脉动热管, 热阻, 传热, 气化, 传递, 倾斜角

CLC Number:

TK124

WANG Yaxiong, DING Xiangyun. Performance study for new type of three-dimensional pulsating heat pipe[J]. Chemical Industry and Engineering Progree, 2016, 35(08): 2367-2372.

王亚雄, 丁祥云. 新型三维脉动热管的性能[J]. 化工进展, 2016, 35(08): 2367-2372.

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