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Heat transfer efficiency enhancement using zigzag louvered fin
Numerical Heat Transfer, Part A: Applications ( IF 2 ) Pub Date : 2020-11-12 , DOI: 10.1080/10407782.2020.1842845
Kiatbodin Wanglertpanich 1 , Chawalit Kittichaikarn 1
Affiliation  

Abstract The present study numerically examines the impact of zigzag fin surface pattern structures in a micro-channel heat exchanger on heat transfer efficiency using a commercial computational fluid dynamics program. The three newly designed louvered fin structures that comprise four triangular zigzag patterns, alternately spaced structures on both fin sides, a flat or zigzag fin structure on either side, and nine triangular zigzag patterns on both fin sides are compared with the reference flat fin. The air inlet velocity and temperature are 5 m/s and 30 °C, respectively, whereas the pressure at the outlet is atmospheric pressure. The wall temperature remains constant at 10 °C. The heat transfer performance is evaluated using the JF factor value, which reflects a performance comparison with the reference. The results show that the zigzag pattern changes the airflow direction, and the time air is trapped inside a fin domain increases. Air also tends to flow toward the zigzag pattern center, increasing the velocity and the heat transfer. The nine triangular zigzag fin pattern structures with the largest heat transfer area provide the best performance with the biggest JF factor increase of 3.24%. This result is obtained despite the comparison of the biggest friction factor values of the three new fin structures, suggesting that the impact of the JF factor far outweighed that of the friction factor.

中文翻译:

使用锯齿形百叶窗翅片提高传热效率

摘要 本研究使用商业计算流体动力学程序数值研究了微通道换热器中锯齿形翅片表面图案结构对传热效率的影响。将三个新设计的百叶窗翅片结构包括四个三角形锯齿形图案,翅片两侧交替间隔的结构,两侧扁平或锯齿形翅片结构,以及翅片两侧的九个三角形锯齿形图案,与参考扁平翅片进行比较。空气入口速度和温度分别为 5 m/s 和 30 °C,而出口处的压力为大气压。壁温保持恒定在 10 °C。传热性能使用 JF 因子值进行评估,该值反映了与参考的性能比较。结果表明,锯齿形图案改变了气流方向,空气滞留在翅片域内的时间增加。空气也倾向于流向锯齿形图案中心,从而增加速度和传热。传热面积最大的九个三角形锯齿状翅片结构提供最佳性能,最大JF系数增加3.24%。尽管比较了三种新翅片结构的最大摩擦系数值,但仍获得了该结果,表明 JF 系数的影响远远超过摩擦系数的影响。传热面积最大的九个三角形锯齿状翅片结构提供最佳性能,最大JF系数增加3.24%。尽管比较了三种新翅片结构的最大摩擦系数值,但仍获得了该结果,表明 JF 系数的影响远远超过摩擦系数的影响。传热面积最大的九个三角形锯齿状翅片结构提供最佳性能,最大JF系数增加3.24%。尽管比较了三种新翅片结构的最大摩擦系数值,但仍获得了该结果,表明 JF 系数的影响远远超过摩擦系数的影响。
更新日期:2020-11-12
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