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首页> 外文期刊>Journal of enhanced heat transfer >OPTIMIZATION OF THE LOUVER FIN-AND-TUBE HEAT EXCHANGERS: A PARAMETRIC APPROACH
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OPTIMIZATION OF THE LOUVER FIN-AND-TUBE HEAT EXCHANGERS: A PARAMETRIC APPROACH

机译：百叶窗换热器优化：参数化方法

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摘要

3D turbulent flow numerical simulations are performed to study heat transfer and flow friction characteristics of louver fin-and-tube heat exchangers. The effects of louver angle, fin pitch, transversal tube pitch, and longitudinal tube pitch on Colburn and friction factors are investigated in detail. Three stages of the effect of louver angle on the Colburn j factor are identified, including rising, level-off, and increasing again. A wide range for louver angle ranging from 0 degrees (plain fin) to 80 degrees is considered. Results show that the Colburn factor increases from a louver angle of 0 degrees (plain fin) to 20 degrees, followed by a level-off or slight decline until the louver angle reaches 45 degrees, and finally, the Colburn factor is increased again with a further rise of louver angle. However, the friction factor increases with an increase in louver angle from 0 degrees (plain fin) to 80 degrees. Colburn and friction factors are almost independent of fin pitch while they decrease with an increase in transversal and longitudinal tube pitches. The optimum louver angle is around 20 degrees upon carrying out the full factorial method in maximizing Colburn factor and minimizing friction factor.
机译：进行3D湍流数值模拟，以研究百叶窗料热交换器的传热和流动摩擦特性。详细研究了百叶窗角，翅片沥青，横向管间距和纵向管间距和纵向管间距的影响。鉴定了百叶窗角度对CONBurn J因子的影响的三个阶段，包括升高，水平，再次增加。考虑百叶窗角度范围为0度（普通鳍）至80度。结果表明，COLBurn因子从0度（普通鳍）的百叶窗角度增加到20度，然后越来越多地下降，直到百叶窗角达到45度，最后，Colburn因子再次增加百叶窗角度的进一步升起。然而，摩擦因子随着0度（普通鳍）至80度的百叶窗角的增加而增加。 COLBURN和摩擦因子几乎独立于翅片间距，而它们随着横向和纵向管间距的增加而降低。在进行最大化的COLBURN因子和最小化摩擦因子时，最佳百叶窗角度在大约20度左右。

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