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Consideration of Heat Transfer Enhancement Mechanism of Nano- and Micro-Scale Porous Layer via Flow Visualization

机译：通过流动可视化考虑纳米和微米级多孔层传热增强机理

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摘要

A convective heat transfer enhancement using nano- and micro-scale porous layer surface was discovered by the authors in 2004. Heat transfer experiments, analytical considerations, and flow visualization near the porous layer were performed to grasp the heat transfer enhancement mechanism. The heat transfer experiments revealed the porous layers were able to enhance heat transfer by 20-25% in net energy compared to the bare plate, independent of substrate materials. In order to understand the mechanism, one-dimensional unsteady heat conduction analysis was performed for a liquid column in the pore. It was found that the temperature recovery of the porous layer was incapable of catching up with the very fast fluctuation, so that the porous layer might be a thermal resistance when the main flow was strongly turbulent. The vestige visualized by the tracer particles of around 0.85 μm in diameter showed a fluid behavior like "squirt" from the porous layer. From the observation of the porous layer surface, the porous layer has some micro-scale bubbles inside its own pore-connecting structure in spite of the good wetting feature. These bubbles could be a main contributor to this heat transfer enhancement. To discuss this postulation, observations of bubble behavior in a microchannel have been carried out.
机译：作者于2004年发现了使用纳米级和微米级多孔层表面的对流传热增强技术。进行了传热实验，分析考虑和在多孔层附近的流动可视化，以掌握传热增强机理。传热实验表明，与裸板相比，多孔层能够将净能量的传热能力提高20-25％，而与基板材料无关。为了理解机理，对孔中的液柱进行了一维非稳态导热分析。发现多孔层的温度恢复不能赶上非常快的波动，因此当主流强烈湍流时，多孔层可能是热阻。直径约0.85μm的示踪剂颗粒可视化的痕迹显示出流体行为，例如从多孔层“喷出”。从多孔层表面的观察，尽管其具有良好的润湿性，但多孔层在其自身的孔连接结构内部仍具有一些微尺度的气泡。这些气泡可能是这种传热增强的主要因素。为了讨论该假设，已经进行了微通道中气泡行为的观察。

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  • 来源
    《Heat Transfer Engineering》 |2011年第12期|p.968-973|共6页
  • 作者

    HAOMIN SUN; ZENSAKU KAWARA; YOSHITAKA UEKI; TETSUO NARITOMI; TOMOAKI KUNUGI;

  • 作者单位

    Department of Nuclear Engineering, Kyoto University, Kyoto City, Japan;

    Department of Nuclear Engineering, Kyoto University, Kyoto City, Japan;

    Department of Nuclear Engineering, Kyoto University, Kyoto City, Japan;

    Department of Nuclear Engineering, Kyoto University, Kyoto City, Japan;

    Department of Nuclear Engineering, Kyoto University, Kyoto City, Japan;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);
  • 原文格式 PDF
  • 正文语种 eng
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