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Experimental Investigation of the Air Flow Behavior and Heat Transfer Characteristics in Microchannels With Different Channel Lengths

机译：不同通道长度微通道内空气流动特性和传热特性的实验研究

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摘要

This paper attempts to experimentally investigate the influence of channel length on the flow behavior and heat transfer characteristics in circular microchannels. The diameters of the channels were 0.4 mm and the length of them were 5 mm, 10 mm, 15 mm, and 20 mm, respectively. All experiments were performed with air and completed with Reynolds number in the range of 300-2700. Results of the experiments show that the length of microchannels has remarkable effects on the performance of flow behavior and heat transfer characteristics. Both the friction factor and Poiseuille number drop with the increase of channel length, and the experimental values are higher than the theoretical ones. Moreover, the channel length does not influence the value of critical Reynolds number. Nusselt number decrease as the increase of channel length. Larger Nusselt numbers are obtained in shorter channels. The results also indicate that in all cases, the friction factor decreases and the Poiseuille number increases with the increase of the Reynolds number. It is also observed that the value of critical Reynolds number is between 1500 and 1700 in this paper, which is lower than the value of theoretical critical Reynolds number of 2300.
机译：本文尝试通过实验研究通道长度对圆形微通道中流动行为和传热特性的影响。通道的直径分别为0.4mm，长度为5mm，10mm，15mm和20mm。所有实验均在空气中进行，并以雷诺数在300-2700之间完成。实验结果表明，微通道的长度对流动​​性能和传热特性有显着影响。随着通道长度的增加，摩擦系数和泊瓦数均下降，实验值高于理论值。而且，通道长度不影响临界雷诺数的值。随着通道长度的增加，Nusselt数减少。在较短的通道中可以获得较大的Nusselt数。结果还表明，在所有情况下，随着雷诺数的增加，摩擦系数减小，泊松数增加。还可以看出，本文的雷诺临界值在1500和1700之间，低于理论雷诺数2300的值。

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  • 来源
    《Journal of Heat Transfer》 |2017年第5期|052403.1-052403.7|共7页
  • 作者

    Zhi Tao; Zhibing Zhu; Haiwang Li;

  • 作者单位

    National Key Laboratory of Science and Technology on Aero-Engine Aero-thermodynamics, The Collaborative Innovation Center for Advanced Aero-Engine of China, Beihang University, Beijing 100191, China,Aircraft/Engine Integrated System Safety Beijing Key Laboratory, Beihang University, Beijing 100191, China;

    National Key Laboratory of Science and Technology on Aero-Engine Aero-thermodynamics, The Collaborative Innovation Center for Advanced Aero-Engine of China, Beihang University, Beijing 100191, China,Aircraft/Engine Integrated System Safety Beijing Key Laboratory, Beihang University, Beijing 100191, China;

    National Key Laboratory of Science and Technology on Aero-Engine Aero-thermodynamics, The Collaborative Innovation Center for Advanced Aero-Engine of China, Beihang University, Beijing 100191, China,Aircraft/Engine Integrated System Safety Beijing Key Laboratory, Beihang University, Beijing 100191, China;

  • 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

    flow behavior; heat transfer; channel length; circular; microchannel;

    机译：流动特性传热通道长度圆形微通道;

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