摘要
针对多通路并联回路板式脉动热管搭建试验台，选用无水乙醇作为工质，在不同的充液率、倾斜角度和加热功率情况下，观测工质的流型以及流动方式的变化，分析脉动热管的启动特性。结果表明，工质的流型为泡状流，汽液塞间隔分布的塞状流，塞状流与环状流并存的混合流，整个通道中不存在完全是环状流的流型；充液率为10％时，工质主要分布在脉动热管的中间部位，充液率为35％-85％，工质分布的均匀性增强；运行过程中工质以塞状流（靠近冷凝端）和环状流（靠近加热端）并存的混合流形式存在，随着加热功率的增加，环状流的平衡位置逐渐向冷凝端移动；启动方式为温度渐进式，启动时间随着加热功率的升高而缩短，倾角的减少而增加，在竖直状态下，脉动热管能够较快启动，正常启动范围为60°-90°，倾角为45°和30°时不能稳定启动。
The Visualization and start up performance of closed-loop plate pulsating heat pipe （PHP） with parallel channels with ethanol as the working fluid under different working conditions is experimentally studied. The influences of liquid filled ratio, inclination angle and heating power on flow pattern and start up performance are analyzed. Results show that flow pattern of working fluid include bubble flow, slug flow, mixed flow（slug flow and annular flow）, but there is not complete annular flow in channels. Working fluid mainly distributed in medial position at filling ratio of 10%, and uniform is improved at filling ratio from 35% to 85%. There are slug flow （close to cooling end） and annular flow（close to heating end） in every channel during operating, and equilibrium position of annular flow moved to cooling end with power increasing. Pattern of PHP is smooth temperature increasing, and start up time decreases with heating power and inclination increasing, but it can not start up with 45°and 30°.
出处
《机械工程学报》
EI
CAS
CSCD
北大核心
2014年第4期155-161,共7页
Journal of Mechanical Engineering
基金
供热供燃气通风及空调工程北京市重点实验室研究基金(NR2013K07)
2013年热能动力工程专业建设(04720413003)资助项目
关键词
多通路并联回路型
板式脉动热管
可视化
倾角
启动特性
closed-loop with parallel channels
plate pulsating heat pipe
visualization
inclination
start-up performance
