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Experimental and 3-D Numerical Analysis of the Thermal-Hydraulic Characteristics of Elliptic Finned-Tube Heat Exchangers

机译:椭圆形翅片管换热器热工水力特性的实验和3D数值分析

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摘要

Fluid flow and heat transfer over a 4-row, elliptic, finned-tube heat exchanger having an axis ratio of 2.83:1 are studied experimentally and numerically. Three types of finned-tube configurations have been investigated under dry and wet conditions for different values of Mel frontal velocity ranging from 2 to 7 m/s: two elliptic finned tubes with staggered and in-line arrangements and one circular finned tube with staggered arrangement. The experimental results indicate that the average heat transfer coefficient of an elliptic finned tube is 35-50% of the corresponding circular finned tube having the same tube perimeter, while the pressure drop for an elliptic finned-tube bank is only 25-30% of the circular finned-tube bank configuration. Three-dimensional numerical results of a laminar model for dry coils are also presented and are compared with the experimental data.
机译:通过实验和数值研究了轴比为2.83:1的四排椭圆翅片管式换热器中的流体流动和传热。已研究了三种类型的翅片管构造,它们在干燥和潮湿条件下对梅尔锋面速度的不同值(范围从2到7 m / s)进行了研究:两个椭圆形翅片管交错排列和排列,一个圆形翅片管交错排列。实验结果表明,椭圆形翅片管的平均传热系数为相应管长相同的圆形翅片管的35-50%,而椭圆形翅片管的压降仅为管长的25-30%。圆形翅片管排结构。还介绍了干燥盘管的层流模型的三维数值结果,并将其与实验数据进行了比较。

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