以去离子水作为工质,在当量直径300～1570 μm的微圆管(1Cr18Ni9Ti)内进行层流流动与换热特性的实验研究.实验结果表明当壁面粗糙度超过1%时摩擦系数随着壁面相对粗糙度的增加而增加.在给定外壁面热流密度的条件下,当雷诺数小于100时,管壁轴向导热对换热特性的影响随着壁厚与内径比的增加而增大;当雷诺数大于100时,轴向导热的影响随着雷诺数的增加逐渐减弱,充分发展区的Nu数接近常规值4.36.
参考文献
| [1] | Gh. Mohiuddin Mala;Dongqing Li .Flow characteristic of water in microtubes[J].International journal of heat and fluid flow,1999(2):142-148. |
| [2] | Li Z X;Du D X;Guo Z Y.Experimental Study on Flow Characteristics of Liquid in Circular Microtubes[A].New York:Begell House,2000:162-168. |
| [3] | H. Herwig;O. Hausner .Critical view on "new results in micro-fluid mechanics' an example[J].International Journal of Heat and Mass Transfer,2003(5):935-937. |
| [4] | Zeng-Yuan Guo;Zhi-Xin Li .Size effect on microscale single-phase flow and heat transfer[J].International Journal of Heat and Mass Transfer,2003(1):149-159. |
| [5] | 唐桂华 .微尺度气体流动与换热特性研究及格子-Boltzmann方法分析[D].西安:西安交通大学,2004. |
| [6] | Shah R K;London A L.Laminar Flow Forced Convection in Ducts[A].Academic Press New York,San Francisco,London,1978:17-36. |
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%