Heat transfer characteristics of the oscillating flows of different working gases in U-shaped tubes of a Stirling engine
Heat transfer characteristics of the oscillating flows of different working gases in U-shaped tubes of a Stirling engine
复制标题
斯特林发动机U形管内不同工作气体振荡流传热特性
DOI：
10.1016/j.applthermaleng.2015.06.063
复制
发表时间：
2015-10
影响因子：
6.4
通讯作者：
Kefa Cen
中科院分区：
文献类型：
--
作者：
Mingjiang Ni;Bingwei Shi;Gang Xiao;Zhongyang Luo;Kefa Cen
振荡流的传热特性与定常流的传热特性有很大的不同，这使得用现有的经验公式很难预测斯特林发动机的有效输入热功率。在压力为0.2MPa ~ 0.9MPa、转速为150 r/min ~ 380 r/min、加热温度为332 °C ~ 516 °C的条件下，对氦气、氮气和二氧化碳在U形管内的振荡流动换热特性进行了实验研究。传热系数随压力和转速的增加而增大，随加热温度的升高而减小。讨论了不同工作介质的影响。氦气的传热系数最高，为115.2-192.1 W/（m2·K），管壁与工质之间的温差最小，为30.1 °C-54.0 °C。二氧化碳和氮气的传热系数略差于氦气，温差分别为45.2-80.7 ℃和41.0-70.1 ℃。提出了考虑工质、压力、转速和加热温度等因素影响的传热计算公式，当雷诺数在61.7 ~ 3184.6范围内时，计算公式的误差在5.2%~ 11.1%之间。
Oscillating flow heat transfer characteristics are quite different from those of steady flows, which make it difficult to predict the effective input heating power of a Stirling engine with existing empirical formulas. This paper reports the experimental study of oscillating flow heat transfer features of helium, nitrogen and carbon dioxide in U-shaped tubes when the pressure, revolving speed and heating temperature are in the ranges of 0.2 MPa–0.9 MPa, 150 r/min–380 r/min and 332 °C–516 °C, respectively. The heat transfer coefficient increases with the increase of the pressure or revolving speed, and it declines when the heating temperature increases. The influences of different working media are discussed. Helium has the highest heat transfer coefficient of 115.2–192.1 W/(m2·K) and the lowest temperature difference of 30.1 °C–54.0 °C between tube walls and the working medium. The heat transfer coefficients of carbon dioxide and nitrogen are slightly worse than those of helium, and the temperature differences are 45.2–80.7 °C and 41.0–70.1 °C, respectively. Heat transfer formulas were proposed, considering the working medium, pressure, revolving speed and heating temperature; the error of the formulas are within 5.2–11.1% when the Reynolds number ranges from 61.7 to 3184.6.
登录
查看更多内容
影响因子：
3.7
作者：
A. Bertelsen
通讯作者：
A. Bertelsen
影响因子：
6.4
作者：
Tie Li;D. Tang;Zhigang Li;Jinglong Du;Tianhao Zhou;Yu-Xiang Jia
通讯作者：
Tie Li;D. Tang;Zhigang Li;Jinglong Du;Tianhao Zhou;Yu-Xiang Jia
影响因子：
--
作者：
D. McEligot;P. Magee;G. Leppert
通讯作者：
D. McEligot;P. Magee;G. Leppert
影响因子：
11.2
作者：
Chin‐Hsiang Cheng;H. Yang
通讯作者：
Chin‐Hsiang Cheng;H. Yang
DOI：
10.1016/j.colsurfa.2014.03.062
发表时间：
2014-10
期刊：
Colloids and Surfaces A: Physicochemical and Engineering Aspects
影响因子：
--
作者：
M. Karbaschi;A. Javadi;Dariush Bastani;Reinhard Miller
通讯作者：
M. Karbaschi;A. Javadi;Dariush Bastani;Reinhard Miller