文中数值模拟了套管的导热系数、纵向长度和肋数对纵向导热的影响,随着纵向长度的增大,纵向导热的影响急剧减小.导热系数和肋数的增加都会使纵向导热的影响增加.对纵向长度小于 100 mm 短管来说,纵向导热越大热短路造成的损失越大,使整个换热芯传热效率相应幅度地降低;对管长大于 100 mm,材料导热系数小于 46 W/(m·K) 的回热器及换热介质为气体的来说,可以忽略纵向导热的影响.
In this paper, a conjugated heat transfer problem of conduction and convection in concentric tubes with longitudinal fins is studied by means of numerical simulation. 3D temperature and fluid flow fields are simulated for three-split concentric tube recuperator with longitudinal fins for gas fluid flow. The numerical simulation results show that the ratio of longitudinal heat conduction amount with the total heat transfer amount decreases quickly as longitudinal length increasing. If the conduit is long enough about 100mm,and with solid thermal conductivity about 46 W/(m·K),and the heat transfer media of gas, the longitudinal heat conduction could be neglected.
参考文献
| [1] | 刘明会,杨茉,徐之平,卢玫,章立新,余敏.复合肋套管导热和对流耦合换热的数值模拟[J].工程热物理学报,2005(01):98-100. |
| [2] | A Campo;J Chang .Correlation Equations for Friction Factors and Convective Coefficients in Tubes Containing Bundles of Internal,Longitudinal Fins[J].Heat and Mass Transfer,1997,33:225-232. |
| [3] | O. Zeitoun;A. S. Hegazy .Heat transfer for laminar flow in internally finned pipes with different fin heights and uniform wall temperature[J].Heat and mass transfer,2004(3/4):253-259. |
| [4] | Colin F .McDonald,Low-Cost Compact Primary Surface Recuperator Concept for Microturbines[J].Applied Thermal Engineering,2000,20:471-497. |
| [5] | TAO Wen-Quan.Numerical Heat Transfer[M].Xi'an:Xi'an Jiaotong University Published,2001 |
- 下载量()
- 访问量()
- 您的评分：
-
10%
-
20%
-
30%
-
40%
-
50%