摘要
通过实验研究了加热功率变化时,铜-水和铜-乙醇振荡热管的传热性能及其壁温波动特征。结果表明:正常工作时,水热管均温性优于乙醇热管,传热热阻较乙醇热管小;低加热功率下,随加热功率增加,水热管壁温波动形式存在明显的转变,而乙醇热管无类似现象;高加热功率下,水热管热阻不断增大,而乙醇热管内局部出现工质过热现象,但依然能保持稳定的传热性能;温度波动振幅及频率大、波动稳定且均匀的热管传热性能较好。
The heat transfer performance and wall temperature variation of copperwater oscillating heat pipe （OHP） and copperethanol OHP at different heating powers was experimentally investi gated. The results show that, under normal conditions, the temperature difference between evapo ration and condensation section of water OHP is smaller than that of the ethanol OHP, and the heat transfer resistance of water OHP is also lower. Comparison of wall temperature fluctuation curves between the two OHPs indicates that, at low heating powers, there are clear shifts in the water OHP＇s wall temperature, with an increase in heating powerhowever, there＇s no such a situa tion in the ethanol OHP at high heating powers, the heat transfer resistance of water OHP in creases continuously,while inside local parts of the ethanol OHP, overheating occurs in working fluid, but the heat transfer performance maintains stable. Finally, the experiments imply that, the heat pipes with large temperature fluctuation amplitude,high vibration frequency, and stable and uniform fluctuation have better heat transfer performance.
出处
《热力发电》
CAS
北大核心
2014年第4期38-42,48,共6页
Thermal Power Generation
关键词
水
乙醇
振荡热管
传热性能
壁温波动
热阻
water ethanol oscillating heat pipe heat transfer performance wall temperature fluc-tuationheat transfer resistance
