Effect of geometrical parameters on flow and heat transfer performances in multi-stream spiral-wound heat exchangers
Effect of geometrical parameters on flow and heat transfer performances in multi-stream spiral-wound heat exchangers
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DOI：
10.1016/j.applthermaleng.2015.04.084
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发表时间：
2015-10
影响因子：
6.4
通讯作者：
Xing Lu;Gaopeng Zhang;Yi-Tung Chen;Qiuwan Wang;M. Zeng
中科院分区：
文献类型：
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作者：
Xing Lu;Gaopeng Zhang;Yi-Tung Chen;Qiuwan Wang;M. Zeng
通过数值模拟，研究了间隔条厚度、第一层管间距、管外径、层数和中心芯径等几何参数的变化对多股流螺旋缠绕换热器流动和传热性能的影响。壳程和管程单位长度的努塞尔数和压降随层数、中心芯直径和管外径的增加而增加，随第一层间隔棒厚度和管间距的增加而减小。利用田口方法对这5个几何参数的影响性能进行了定量估计，结果表明，它们的贡献率都在5%以上。因此，考虑的主要几何参数的多元相关性开发壳侧努塞尔数和摩擦系数。
The influences of the changes in geometrical factors, including the space bar thickness, the tube pitch in the first layer, the tube external diameter, the number of layers and the centre core diameter on flow and heat transfer performances in multi-stream spiral-wound heat exchangers are numerical investigated. The shell-side and tube-side Nusselt number and pressure drop per unit length increase with the increase of number of layers, centre core diameter, and tube external diameter, but decrease with the increase of space bar thickness and tube pitch in the first layer. Quantitatively estimation of the affecting performances of these five geometrical parameters is implemented by using the Taguchi method, and the result shows that the contribution rate of them are more than 5%. Thus, the multivariate correlations with the main geometrical parameters considered are developed for shell-side Nusselt number and friction coefficient.