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首页> 外文期刊>International Journal of Heat and Mass Transfer >Effect of winglet location on performance of fin-tube heat exchangers with inline tube arrangement
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Effect of winglet location on performance of fin-tube heat exchangers with inline tube arrangement

机译：小翼位置对直列管式翅片管换热器性能的影响

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摘要

Heat transfer performance of fin-tube heat exchangers can be enhanced by introducing longitudinal vortices generated using vortex generators (VGs). Location of VGs with respect to tubes plays major role in deciding the enhancement in heat transfer. Three-dimensional numerical investigations have been carried out to study the effect of winglet location on heat transfer characteristics of fin-tube heat exchangers for inline tube arrangement. In this study, rectangular winglet pair (RWP) type VGs having common flow down configuration are considered. Initially, effect of different possible locations of RWP corresponding to tube centre have been investigated to analyse the heat transfer and flow field characteristics. Further, effects of angle of attack (β) ranging from 15° to 60° and Reynolds number (Re) in the range from 2000 to 4000 have also been studied for the location associated with maximum heat transfer corresponding to mean values ofβandRein the considered range. To illustrate the interesting flow features of vortices generated due to placement of RWPs and how those affect heat transfer, streamlines and temperature contours have been investigated. Enhancement in heat transfer has been quantified using Nusselt number while pressure loss is estimated with the help of friction factor. Role of secondary flow induced by RWPs is quantified in terms of secondary flow intensity. Thermal performance factor (JF) is used to evaluate the combined effect of enhancement in heat transfer and increase in pressure drop. For upstream located RWPs, the value of JF is found to be higher due to lower pressure loss as compared to RWPs mounted in other regions. The value of JF is maximum for RWP located at ΔX = −2.0, ΔY = ±1.25 and correspondingly 37.6% enhancement in heat transfer is observed as compared to the case for the arrangement in absence of RWPs.
机译：可以通过引入使用涡流发生器（VG）产生的纵向涡流来增强翅片管热交换器的传热性能。 VG相对于管的位置在决定传热的增强中起着重要作用。已经进行了三维数值研究，以研究小翼位置对直列管布置的翅片管热交换器的传热特性的影响。在这项研究中，考虑具有共同的向下流动构造的矩形小翼对（RWP）型VG。最初，已经研究了与管中心相对应的RWP不同可能位置的影响，以分析热传递和流场特性。此外，对于与最大传热相关的位置，也研究了迎角（β）在15°到60°范围内的雷诺数（Re）在2000到4000范围内的影响，对应于β和Re的平均值。为了说明由于RWP的放置而产生的涡流的有趣流动特征，以及它们如何影响传热，流线和温度等高线。传热的增强已使用Nusselt数进行了量化，而压力损失则借助摩擦系数进行了估算。由RWP引起的二次流的作用是根据二次流强度进行量化的。热性能因子（JF）用于评估传热增强和压降增加的综合效果。对于上游定位的RWP，与安装在其他区域的RWP相比，由于较低的压力损失，JF值较高。对于位于ΔX＝ s-2.0，ΔY＝±1.25的RWP，JF的值最大，并且与没有RWP的布置的情况相比，相应地观察到热传递提高了37.6％。

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