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单回路脉动热管温度振荡特性实验研究 被引量:2

Experimental Study on Temperature Oscillation Characteristic of Single-loop Pulsating Heat Pipe
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摘要 通过对单回路紫铜-水脉动热管壁温振荡特性的实验研究,揭示传热功率、充液率和管径对热管启振及传热性能的影响。实验采用风冷却方式和定热流加热,测试稳定运行时加热段和冷却段外壁温的波动特性曲线,得到温度振荡与热管传热功率之间的的内在关系;同时研究了充液率和管径对管壁温振荡特性的影响。结果显示,随加热功率的增加,管壁温振荡呈现四种状态,无振荡、启振、大幅振荡和小幅均匀振荡;频率呈现由小到大和高位稳定振荡的特点。充液率和管径对热管的启振功率、振幅和频率都有影响;中间管径和中间充液率热管的启振功率最小;管内径越小,充液率越大,热管的温度振幅越大;中间管径、中间充液率的热管的平均振荡频率最大,而大管径、小充液率管子的平均振荡频率最小。当传热功率达到一定值时,振荡转变为小幅均匀振荡,充液率和管内径对热管振幅和频率的影响变小。 Through the experimental study on the characteristics of wall temperature oscillation of copper-water single-loop pulsating heat pipe, this paper reveals the influence of heat transfer rate, charging ratio and pipe diameter on start-up and heat transfer performance of heat pipe. The experiment used air-cooled under constant heat flux input for testing the wall temperature characteristics curve of heating section and cooling section of heat pipe in the stable operation condition. The internal relation between temperature oscillation and heat transfer rate of heat pipe was obtained, and the influences of charging ratio and pipe diameter on wall temperature characteristics curve of heat pipe were studied. The results indicated that wall temperature oscillation of heat pipe presented four states under the situation of increasing heating power: non-oscillatory, oscillation starting, sharply oscillation and small uniform oscillation. The oscillation frequency changed from low to high and placed in high stable oscillation. Charging ratio and pipe diameter affected start-up power, amplitude and frequency of heat pipe. The start-up power of heat pipe which had intermediate value in charging ratio and pipe diameter was minimum. The smaller pipe inner diameter was, the larger charging ratio and temperature amplitude of heat pipe were. The average oscillation frequency of heat pipes which had intermediate value in charging ratio and pipe diameter was maximum, while heat pipes which had larger pipe diameter and smaller charging ratio had the minimum average oscillation frequency. The temperature oscillation changed into small uniform oscillation when the heat transfer rate reached a certain value, and the influence of charging ratio and pipe diameter on amplitude and frequency became smaller.
作者 苏磊 张红 丁锐 丁雷江 SU Lei, ZHANG Hong, DING Rui, DING Leijiang (College of Energy, Nanjing University of Technology, Nanjing 210009, Jiangsu Province, China)
出处 《中国电机工程学报》 EI CSCD 北大核心 2011年第20期67-74,共8页 Proceedings of the CSEE
关键词 单回路脉动热管 管壁温度 振荡特性 紫铜-水 single-loop pulsating heat pipe pipe wall temperature oscillation characteristics red copper-water
作者简介 苏磊(1969-),女,副教授,博士研究生,主要从事高效传热传质设备研究,sulei69@sohu.com。
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