倾角对不同充液率重力热管性能的影响  

Influence of Inclination Angle on Performance of Gravity Heat Pipes with Different Liquid Filling Ratio

作　　者：张瑞瑛 郑庆红[1] 贾雷雷 张梦远 ZHANG Rui-ying;ZHENG Qing-hong;JIA Lei-lei;ZHANG Meng-yuan(School of Building Services Science and Engineering,Xi’an University of Architecture and Technology)

机构地区：[1]西安建筑科技大学建筑设备科学与工程学院

出　　处：《建筑热能通风空调》2021年第3期14-18,共5页Building Energy & Environment

摘　　要：基于不锈钢—水重力热管,实验研究了变倾角在不同充液率(15%,30%和45%)下对传热的影响。分析讨论了倾角对壁温时间响应特性,上下壁面温差分布及传热系数等传热性能的影响。研究表明:倾角对重力热管的壁温特性及传热特性有显著影响。在倾角为65°时热管的启动速度快于其余角度,所有实验倾角下热管内蒸汽流动随着加热功率的增加趋于稳定,壁温波动振幅减小。管壁上下表面间的温差随着倾角的增加而减小,最大温差发生在液池高度附近可达7.23℃左右。蒸发段和冷凝段管壁上下表面传热系数均随倾角增大呈先增后减的趋势,最佳传热倾角在55°~65°左右。Based on the stainless steel-water gravity heat pipe, the effect of the inclination angle on the heat transfer at different filling rates(15%, 30% and 45%) was studied experimentally. The effects of inclination angle on wall temperature, wall temperature difference distribution and heat transfer coefficient are discussed. The results have shown that the inclination angle has a significant effect on the wall temperature characteristics and heat transfer characteristics of the gravity heat pipe.The inclination angle at 65° is the fastest starting speed of the experiment angles.Under all the experimental inclination angles, the steam flow in the heat pipe tends to be stable with the increase of the heating power,and the wall temperature fluctuation amplitude decreases. The temperature difference between the upper and lower surfaces of the pipe wall decreases with the increase of the inclination angle. The maximum temperature difference can reach 7.23 ℃ near the height of the liquid pool.The heat transfer coefficients of the upper and lower surfaces of the evaporation section and the condensation section increase first with the increase of the inclination angle. The trend of post-reduction, the best heat transfer inclination angle is at around 55°~ 65°.

关 键 词：重力热管 倾角 充液率 壁温特性 传热特性 

分 类 号：TK172.4[动力工程及工程热物理—热能工程]