以常压去离子水为工质,对自然循环工况下上升加热段内单相水的摩擦阻力及对流传热特性进行了实验研究.结果表明,自然循环工况下加热段内由浮升力引起的自由流动对摩擦阻力及对流传热特性有重要影响,自然循环与强制循环二种工况下加热段内的摩阻系数及对流换热系数存在明显差别;并且,自然循环工况下加热段内的摩擦阻力存在滞后现象.通过实验提出了计算自然循环工况下加热段内单相水的摩阻系数及对流换热系数的经验关系式.
参考文献
| [1] | W M 罗森诺;等;齐欣.传热学基础手册[M].北京:科学出版社,1992 |
| [2] | 杨世铭;陶文铨.传热学[M].北京:高等教育出版社,1998 |
| [3] | B Metais;E R G Eckert .Forced,Mixed,and Free Con vection Regimes[J].Journal of Heat Transfer,1964,86:295-296. |
| [4] | B S Petkhov;A F Polyakov.Heat Transfer in Turbulent Mixed Convection[M].New York:Hemisphere Publishing Corporation,1988 |
| [5] | P K Vijayan;S K Mehta;A W Date .On the Steady State Performance Of Natural Circulation Loops[J].International Journal Heat Mass and Transfer,1991,34(09):2219-2230. |
| [6] | W Churchill.Combined Free and Forced Convection in Channels[A].Begell-House,1992 |
| [7] | T Aicher;H Martin .New Correlation for Mixed Turbulent Natural and Forced Convection Heat Transfer in Vertical Tubes[J].International Journal Heat Mass and Transfer,1997,40(15):3617-3626. |
| [8] | V Gnielinski .New Equations for Heat and Mass Transfer in Turbulent Pipe and Channel Flows[J].International Chemical Engineering,1976,16:403-368. |
上一张
下一张
上一张
下一张
计量
- 下载量()
- 访问量()
文章评分
- 您的评分：
-
10%
-
20%
-
30%
-
40%
-
50%