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首页> 外文期刊>International Journal of Heat and Mass Transfer >Thermal performance of channel flow with detached and attached pin-fins of hybrid shapes under inlet flow pulsation
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Thermal performance of channel flow with detached and attached pin-fins of hybrid shapes under inlet flow pulsation

机译：入口流量脉动下的拆卸和连接销鳍片的沟道流动的热性能

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摘要

A newly devised hybrid pin-fin array composed by the attached rhombuses and the hexagon pin-fins was proposed for heat transfer enhancements. The flow pulsation at channel entrance was stimulated by venting the airflow periodically at the frequencies of 1/4, 1/6 and 1/12 Hz with the time-mean Reynolds number, Re, controlled at 1500, 2000, 5000, 10,000, 15,000 and 20,000 to give rise the Strouhal number, Sr, in the range of 0.00028-0.017. At each Re and Sr tested, the open period of vented flow was adjusted to 1/4, 1/2 or 3/4 pulsation cycle to alter the pulsating waveform. A selective set of full-field Nusselt number distributions and Fanning friction factors illustrated the general and individual hydrothermal impacts in association with Re, Sr and the frequency and waveform of the pulsating flow. As Sr increased continuously, the area-averaged time-mean Nusselt numbers were initially reduced but recovered and then raised above than the steady-flow references. The Fanning friction factors of pulsating flows were initially reduced and then increased from the steady-flow baselines as Sr increased. With the significant heat transfer elevations by the present pin-fin array from the smooth tubular flow references, the thermal performance factors at Re>5000 were above unity. Two sets of empirical correlations were devised for evaluating the time-mean area-averaged Nusselt numbers and Fanning friction factors of the present pin-fin channel with steady and pulsating flows.
机译：提出了一种新设计的菱形和六角形翅片组成的混合钉鳍阵列，用于传热增强。通过在1/4,1 / 6和1/12 Hz的频率周期性地通过时间平均雷诺数，Re，在1500,2000,5000,11,000,15,000的频率将气流周期性地刺激通道入口处的流量脉动。 20,000，给出Strouhal数，SR，范围为0.00028-0.017。在测试的每个RE和SR处，将排出流的开放时间调整为1/4,1 / 2或3/4脉动循环以改变脉动波形。一种选择性的全场露天编号分布和扇形摩擦因子，说明了与RE，SR和脉动流的频率和波形相关联的一般和单独的水热影响。随着SR连续增加，区域平均时间平均露珠数最初被降低但回收，然后升高而不是稳定的参考。脉动流动的扇形摩擦因子最初减少，然后随着SR增加而从稳态基线增加。通过从光滑的管状流动参考的本发明的销鳍阵列的显着传热升高，RE> 5000的热性能因子高于统一。设计了两组经验相关性，用于评估具有稳定和脉动流动的当前销翅沟道的时间平均区域平均的露天数和扇形摩擦因子。

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  • 来源
    《International Journal of Heat and Mass Transfer》 |2021年第1期|120554.1-120554.24|共24页
  • 作者

    Shyy Woei Chang; Ting Hung Cheng;

  • 作者单位

    Department of Systems and Naval Mechatronic Engineering National Cheng Kung University. No. 1. University Road. Tainan City. 70101. Taiwan ROC;

    Department of Systems and Naval Mechatronic Engineering National Cheng Kung University. No. 1. University Road. Tainan City. 70101. Taiwan ROC;

  • 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

    Pin-fin channel; Pulsating flow; Heat transfer enhancement;

    机译：PIN翅片通道;脉动流动;传热增强;

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