通过实验研究了内置均匀加热板的垂直矩形通道入口段混合对流换热的温度场和阻力特性.实验分别针对同向流动和反向流动两种情况进行了研究,其中Re=329～5565,Gr=9.7×105～7.7×106.通过实验得到了矩形通道内混和对流换热的总体平均Nusselt数和压力损失的变化规律.实验表明固体壁面的导热对总体换热具有非常重要的作用.平均Nusselt数随Re的增加而增加;Re＜1000时反向流动的Nusselt数大于同向流动时Nusselt数,Re＞1800时二者相差很小.压力损失与Re近似为乘幂关系,且随热流密度变化很小.
参考文献
| [1] | B Metais;E R G Eckert .Forced,Mixed,and Free Convection Regimes[J].Transactions of the ASME Journal of Heat Transfer,1964,86(02):295-296. |
| [2] | J D Jackson;M A Cotton;B P Axcell .Studies of Mixed Convection in Vertical Tubes[J].International Journal of Heat and Fluid Flow,1989,10(01):2-15. |
| [3] | T. W. Gyves;T. F. Irvine Jr. .Laminar conjugated forced convection heat transfer in curved rectangular channels[J].International Journal of Heat and Mass Transfer,2000(21):3953-3964. |
| [4] | P J Heggs;D B Iigham;D J Keen .The Effects of Heat Conduction in The Wall on The Development of Recirculating Combined Convection Flows in Vertical Tubes[J].International Journal of Heat and Mass Transfer,1990,33(03):517-528. |
| [5] | W L Lin;Y T Ker;T F Lin .Experimental Observation and Conjugated Heat Transfer Analysis of Vortex Flow Development in Mixed Convection of Air in A Horizontal Rectangular Duct[J].International Journal of Heat and Mass Transfer,1996,39(17):3667-3683. |
| [6] | W. L. Lin;T. F. Lin .Observation and computation of vortex and/or reverse flow development in mixed convection of air in a slightly inclined rectangular duct[J].Journal of heat transfer: Transactions of the ASME,1997(4):691-699. |
| [7] | C K Brown;W H Gauvin .Combined Free and Forced Convection,Ⅰ,Ⅱ[J].Canadian Journal of Chemical Engineering,1965,43(06):306-320. |
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%