Correlation to predict heat transfer characteristics of a closed end oscillating heat pipe at critical state
Correlation to predict heat transfer characteristics of a closed end oscillating heat pipe at critical state
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DOI：
10.1016/j.applthermaleng.2005.01.009
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发表时间：
2005-10
影响因子：
6.4
通讯作者：
T. Katpradit;T. Wongratanaphisan;P. Terdtoon;P. Kamonpet;A. Polchai;A. Akbarzadeh
中科院分区：
文献类型：
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作者：
T. Katpradit;T. Wongratanaphisan;P. Terdtoon;P. Kamonpet;A. Polchai;A. Akbarzadeh
本文对封闭式振荡热管的临界传热特性进行了实验研究。研究的参数包括管段长度、工质和临界状态下传热特性的无量纲参数。本研究中使用了一组27个铜管CEOHP，内径分别为2.03、1.06和0.66 mm;由5、10和15个曲折转弯组成，截面长度分别为50、100和150 mm。每个CEOHP具有相等长度的冷凝器、绝热器和蒸发器部分。使用的工作流体是R123、乙醇和水，填充率为管总体积的50%。将CEOHP设置为在垂直和水平方向上操作，工作温度保持在60±5°C。结果表明，临界热流密度随截面长度的增加而减小，随工质汽化潜热的增加而增大。在水平加热模式下，影响换热特性的无量纲参数主要为Ku、Di/Le、Ja和Bo，而在垂直加热模式下，影响换热特性的无量纲参数主要为Ku、Di/Le、Ja、Bo和1+（ρv/ρl）0.25。表示垂直模式的淹没现象的附加无量纲参数为1+（ρl/ρv）0.25。在水平和垂直加热模式下，临界热流密度的关联式和临界热流密度的预测参数分别为：和，标准偏差（STD）分别为±18%和±29%。
This paper discusses experimental studies of the heat transfer characteristics at critical state of a closed end oscillating heat pipe (CEOHP). The parameters studied were the section lengths, working fluid and the dimensionless parameters of heat transfer characteristics at critical state. A set of 27 copper-tubed CEOHPs with internal diameters of 2.03, 1.06 and 0.66mm; consisting of 5, 10 and 15 meandering turns and section lengths of 50, 100 and 150mm was used in this study. Each CEOHP had a condenser, adiabatic and evaporator section of equal length. The working fluids used were R123, ethanol, and water with a filling ratio of 50% of total volume of the tube. The CEOHPs were set to operate at both vertical and horizontal orientations with a working temperature maintained at 60±5°C. The results show that the critical heat flux decreased as the section length increased, but increased with an increase in the latent heat of vaporization of the working fluid. The dominating dimensionless parameters on the heat transfer characteristics at horizontal heat mode were Ku, Di/Le, Ja and Bo while Ku, Di/Le, Ja, Bo and 1+(ρv/ρl)0.25dominated at vertical heat mode. An additional dimensionless parameter that represents flooding phenomenon for vertical mode was 1+(ρl/ρv)0.25. The correlations of critical heat flux and the parameters for prediction of the critical heat flux at the horizontal and the vertical heat mode were:andwith standard deviations (STD) of ±18% and ±29% respectively.