Experimental research on influence of abnormal shape on heat transfer performance of copper-water heat pipe

doi:10.11949/0438-1157.20210484

Abstract

Abstract:

In order to study the influence of abnormal shape on the performance of heat pipes, three copper-water heat pipes were experimentally studied. The heating temperature range is 50—90℃, and the cooling water flow range is 40—104 L/h. Comparing the starting performance and isothermal performance under different working conditions, the results show that abnormal-shaped pipes may appear “temperature hysteresis” phenomenon when the heating temperature is low, which significantly increases the start-up time, but the start-up time of all working conditions is within 4 min; the abnormal shape makes the isothermal performance of the heat pipe worse but it is still within the acceptable range. The maximum heat transfer power, the heat transfer resistance of the evaporation section, and the overall thermal resistance under different application conditions have been studied. The experiment shows that when the heating temperature is low， the special shape has a greater influence on the maximum heat transfer power and heat transfer resistance. When the heating temperature is greater than 80℃， the maximum heat transfer power difference between the special shape tube and the straight tube is reduced to 30%， and the heat transfer resistance at this time reaches the level of 10^-2.

Key words: heat pipe, abnormal shape, heat transfer, thermal resistance, evaporation, condensation

摘要：

为了研究异型对于热管性能的影响，对三支铜-水热管进行了实验研究。加热温度范围为50~90℃，冷却水流量范围为40~104 L/h，对比不同工况下的启动性能、等温性能，结果表明，异型管在加热温度较低时可能出现“温度滞后”现象，从而使启动时间显著增加；异型使得热管等温性能变差但仍在可接受的范围内。对不同应用条件下的最大传热功率、蒸发段传热热阻、整体热阻进行了研究，实验表明：加热温度较低时，异型对于最大传热功率及传热热阻的影响较大，当加热温度大于80℃时，异型管与直管之间最大传热功率的差值缩小到30%以内，且此时的传热热阻达到10^-2量级水平。

关键词: 热管, 异型, 传热, 热阻, 蒸发, 凝结

CLC Number:

TK 172.4

Lei ZHANG,Ye DAI,Xingwei CHEN,Jie ZHANG,Yang ZOU. Experimental research on influence of abnormal shape on heat transfer performance of copper-water heat pipe[J]. CIESC Journal, 2021, 72(10): 5132-5141.

张磊,戴叶,陈兴伟,张洁,邹杨. 折弯异型对铜-水热管传热性能影响的实验研究[J]. 化工学报, 2021, 72(10): 5132-5141.

Figures/Tables 13

Fig.1 Design drawing of heat pipes

Fig.2 Experimental setup

Fig.3 Layout position of temperature sensors

Fig.4 Temperature change during start-up at 50℃ heating temperature

Fig.5 Start-up time of heat pipes

Fig.6 Isothermal temperature after steady state

Fig.7 Comparison of isothermal temperature after steady state

Fig.8 Heat transfer power of heat pipes

Fig.9 Comparison of maximum heat transfer power

Fig.10 Heat transfer resistance of the evaporation section

Fig.11 Comparison of heat transfer resistance

Fig.12 Total thermal resistance of heat pipes

Fig.13 Comparison of total thermal resistance

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