Developing turbulent convective heat transfer in helical pipes
Developing turbulent convective heat transfer in helical pipes
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DOI：
10.1016/s0017-9310(97)00042-2
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发表时间：
1997-10-01
影响因子：
5.2
通讯作者：
Ebadian, MA
中科院分区：
文献类型：
--
作者：
Lin, CX;Ebadian, MA
对有限螺距螺旋管内三维湍流发展对流换热进行了全椭圆数值研究。湍流计算采用k-epsilon标准两方程湍流模型。控制方程采用控制体积有限元方法求解。数值计算结果与已有的实验数据进行了比较，取得了较好的一致性。结果表明，雷诺数范围为2.5×10(4)与1.0×10(5)相似，螺距范围为0.0至0.6，曲率比范围为0.025至0.050。给出并讨论了有效导热系数和温度场以及局部和平均Nusselt数的发展。研究发现，所考察的参数对螺旋管内的热场发展和换热有复杂的影响。螺旋管的Nusselt数在流动完全发展之前是振荡的，特别是在曲率比较大的情况下。(C)1997年爱思唯尔科学有限公司。
A fully elliptic numerical study has been carried out to investigate three-dimensional turbulent developing convective heat transfer in helical pipes with finite pitches. The k-epsilon standard two-equation turbulence model is used to simulate turbulent flow. The governing equations are solved by a control-volume finite element method. Numerical results have been compared to the existing experimental data and a good agreement has been obtained. The results presented in this paper cover a Reynolds number range of 2.5 x 10(4) similar to 1.0 x 10(5), a pitch range of 0.0 similar to 0.6 and a curvature ratio range of 0.025 similar to 0.050. The developments of effective thermal conductivity and temperature fields and local and average Nusselt numbers are given and discussed. It has been found that the examined parameters exert complex effects on developing thermal fields and heat transfer in the helical pipes. The Nusselt numbers for the helical pipes are oscillatory before the flow is fully developed, especially for the case of relatively large curvature ratio. (C) 1997 Elsevier Science Ltd.