摘要
为了研究混沌特性对脉动热管传热性能的影响,搭建了闭式脉动热管传热性能的实验台.通过实验测量了以水为工质的管式脉动热管在风冷条件下不同倾角(30°、45°、60°、90°)与不同加热功率(15 W、30 W、45 W、60 W、75 W、90 W、105 W)下各测温点处的壁面温度,研究了倾角与加热功率对脉动热管传热性能的影响规律,并通过对蒸发段与冷凝段管壁温度(θ_(4)和θ_(13))的时间序列进行相空间重构,用Matlab程序绘制了混沌吸引子图,计算了各工况的最大李雅普诺夫指数,分析了脉动热管混沌特性对传热性能的影响.结果表明:在30°~90°倾角范围内,随着加热功率的增加,脉动热管的总热阻逐渐减小,蒸发段传热系数增大;在较大加热功率下,倾角对脉动热管传热性能的影响很小,而最大李雅普诺夫指数随着加热功率的增加而增大,混沌性越强传热性能越好.
In order to study the influence of chaotic characteristics on the heat transfer performance of pulsating heat pipes,an experimental platform for the heat transfer performance of closed pulsating heat pipe was built.The heat transfer performance of tabular pulsating heat pipe with water as working medium was measured under air-cooled conditions with different inclination angles(30°,45°,60°and 90°)and different heating power rates(15 W,30 W,45 W,60 W,75 W,90 W and 105 W)were measured under air-cooled conditions.The effects of inclination angles and heating powers on the heat transfer performance of pulsating heat pipe were studied.By reconstructing the phase space of the time series of wall temperature in evaporation section and condensation section(θ_(4),θ_(13)),the chaotic attractor diagram was drawn with Matlab program,and the maximum Lyapunov index of each working condition was calculated.The effect of chaotic characteristics of pulsating heat pipe on the heat transfer performance was analyzed.The results show that with the increase of heating power,the total thermal resistance of the pulsating heat pipe gradually decreases and the heat transfer coefficient of the evaporation section increases within the range of inclination angle of 30°~90°.Under higher heating power,the inclination angle has little effect on the heat transfer performance of the pulsating heat pipe,while the maximum Lyapunov index increases with the increase of heating power,and the stronger the chaos,the better the heat transfer performance.
作者
战洪仁
史胜
张倩倩
王立鹏
才月
吴霖
于胜利
ZHAN Hong-ren;SHI Sheng;ZHANG Qian-qian;WANG Li-peng;CAI Yue;WU Lin;YU Sheng-li(Shenyang University of Chemical Technology,Shenyang 110142,China)
出处
《沈阳化工大学学报》
CAS
2022年第3期221-228,共8页
Journal of Shenyang University of Chemical Technology
基金
国家自然科学基金(61473056)。
关键词
脉动热管
传热热阻
倾角
李雅普诺夫指数
pulsating heat pipe
heat transfer resistance
inclination angle
Lyapunov index
