Effect of small inclination angle on heat transfer performance of Ω-shaped bending heat pipe
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摘要:
为研究小倾角对Ω形槽道弯曲热管传热特性的影响，搭建了热管传热性能实验台，基于实验对不同小倾角下热管的温度分布、总热阻、当量导热系数和最大输入功率进行分析。结果表明：在相同输入功率下，倾角为0°和倾角为负的热管壁温均匀性优于倾角为正的热管；倾角为正的热管总热阻最大，倾角为0°和倾角为负的热管总热阻相近；热管倾角为0°时的最大输入功率最高。热管安装和应用中易出现重力倾角偏差，研究结果表明，较小倾角会对Ω形槽道弯曲热管的传热性能造成影响。
Abstract:An experimental platform for studying the heat transfer performance of heat pipes was set up to investigate the effect of a small inclination angle on the heat transfer performance of Ω-shaped bending heat pipes. The temperature distribution, total thermal resistance, thermal conductivity, and maximum heat transfer power of heat pipes with different small inclination angles were analyzed in the experiment. The results show that the wall temperature uniformity of heat pipes with zero and negative inclination angles is better than that of heat pipes with positive inclination angles at the same heating power. The heat pipe with a positive inclination angle has the largest total thermal resistance. The total thermal resistance of heat pipes with zero and negative inclination angles is similar. The maximum heat transfer power of heat pipes with zero inclination angle is the highest. In installation and application, the heat pipe will inevitably face gravity inclination angle deviation. The research results indicate that the small inclination angle can affect the heat transfer performance of Ω-shaped bending heat pipes.
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图 1 实验测试装置
1. 数据采集仪；2. 计算机；3. 实验热管；4. 陶瓷加热片；5. 直流稳压电源；6. 水冷板；7. 低温恒温槽；8. 热电偶。
Figure 1. Experimental setup
图 4 热管瞬态热响应的轴向温度变化
Figure 4. Axial temperature variation of transient thermal response for heat pipe
图 5 热管稳态时的轴向温度分布
Figure 5. Axial temperature distribution of heat pipe in steady state
图 6 120 W输入功率下不同倾角热管的轴向温度分布
Figure 6. Axial temperature distribution of heat pipe with different inclination angles under 120 W heating power
图 7 不同倾角热管的热阻
Figure 7. Thermal resistance of heat pipe with different inclination angles
图 8 不同倾角热管的当量导热系数
Figure 8. Thermal conductivity of heat pipe with different inclination angles
图 9 不同冷源温度下各倾角热管的最大输入功率
Figure 9. Maximum heat transfer power of heat pipe with different inclination angles at different cold source temperatures
图 10 不同倾角热管的液体工质积聚
Figure 10. Working fluid accumulation in heat pipe with different inclination angles
表 1 热管截面参数
Table 1. Cross-section parameters of heat pipe
横截面宽度$ {L_{\text{a}}} $/mm 横截面高度$ {L_{\text{b}}} $/mm 蒸汽腔直径$ {D_{\text{v}}} $/mm 吸液芯直径$ {D_{\text{l}}} $/mm 两孔圆心间距$ {L_{\text{c}}} $/mm 孔半径$ R $/mm 狭缝宽度$ w $/mm 狭缝高度$ h $/mm 单孔吸液芯通道数目 18.00 9.00 4.00 1.24 9.00 3.60 0.48 0.36 11 
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