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首页> 外文期刊>Journal of Heat Transfer >Numerical Analysis of Flow Structure and Heat Transfer Characteristics in Dimpled Channels With Secondary Protrusions
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Numerical Analysis of Flow Structure and Heat Transfer Characteristics in Dimpled Channels With Secondary Protrusions

机译：二次凸凹坑道内流动结构与传热特性的数值分析

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摘要

Dimple structure is an effective heat transfer augmentation approach on coolant channel due to its advantage on pressure penalty. The implication of secondary protrusion, which indicates protrusion with smaller dimension than dimple, will intensify the Nusselt number Nu inside dimple cavity without obvious extra pressure penalty. The objective of this study is to numerically analyze the combination effect of dimples and secondary protrusion. Different protrusion-dimple configurations including protrusion print-diameter D_p, protrusion-dimple gap P, and staggered angle α are investigated. From the results, it is concluded that the implication of secondary protrusion will considerably increase the heat transfer rates inside dimple cavity. Cases 4 and 6 possess the highest Nusselt number enhancement ratio NulNuo reaching up to 2.1-2.2. The additional pressure penalty brought by the protrusion is within 15% resulting in total friction ratio f/f_o among the range of 1.9-2.1. Dimpled channels with secondary protrusions possess higher thermal performance factor TP, defined as (Nu/Nu_o)l(f/f_o)1 • among which cases 4 and 6 are the optimal structures. Besides this, the TP of protrusion-dimple channels are comparable to the other typical heat transfer devices, and higher TP can be speculated after a more optimal dimple shape or combination with ribs and fins.
机译：酒窝结构由于其在压力损失方面的优势，是在冷却剂通道上有效的传热增加方法。二次突起的暗示，即突起的尺寸小于酒窝，将增强酒窝腔内的努塞尔数Nu，而不会产生明显的额外压力损失。这项研究的目的是从数值上分析酒窝和二次突出的组合效应。研究了包括凸出印刷直径D_p，凸出凹痕间隙P和交错角α在内的不同凸出凹痕构造。从结果可以得出结论，暗示第二突起将大大增加酒窝腔内的传热速率。案例4和6具有最高的Nusselt数增强比NulNuo，最高可达2.1-2.2。突起带来的额外压力损失在15％以内，导致总摩擦比f / f_o在1.9-2.1的范围内。具有次要突起的凹陷通道具有较高的热性能因子TP，定义为（Nu / Nu_o）l（f / f_o）1•，其中情况4和6是最佳结构。除此之外，突起-凹痕通道的TP可与其他典型的传热装置相媲美，并且可以在更理想的凹痕形状或与肋和鳍结合后推测出更高的TP。

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  • 来源
    《Journal of Heat Transfer》 |2016年第3期|031901.1-031901.6|共6页
  • 作者

    Yonghui Xie; Zhongyang Shen; Di Zhang; Phillip Ligrani;

  • 作者单位

    School of Energy and Power Engineering, Xi'an Jiaotong University, Xi'an, Shaanxi 710049, China;

    School of Energy and Power Engineering, Xi'an Jiaotong University, Xi'an, Shaanxi 710049, China;

    Key Laboratory of Thermo-Fluid Science and Engineering, Ministry of Education, School of Energy and Power Engineering, Xi'an Jiaotong University, Xi'an, Shaanxi 710049, China;

    Department of Mechanical and Aerospace Engineering, University of Alabama in Huntsville, Huntsville, AL 35899;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    dimple; protrusion; heat transfer; numerical simulation;

    机译：酒窝;突出;传播热量;数值模拟;

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