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首页> 外文期刊>International Journal of Heat and Mass Transfer >Trains of Taylor bubbles over hot nano-textured mini-channel surface
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Trains of Taylor bubbles over hot nano-textured mini-channel surface

机译：泰勒气泡在热的纳米结构化微通道表面上的变化

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摘要

To enhance heat transfer in forced convective boiling the mini-channel bottom was amended by nano-textured structures - periodic rectangular mats of electrospun polymer nanofibers. The fibers were about several hundreds of nanometer in diameter. The test fluid was FC-72. The flow in mini-channels contained trains of the Taylor bubbles. The role of the nanofibers was to retain the warm mini-channel bottom wetted, to prevent dry-out and thus to enhance the heat removal rate. In the present experiments the time-average heat flux at the nanofiber-coated domains was found to be 1.6 times higher than that at the uncoated ones. Accordingly, a significant decrease (by 5-8 K) in the superheat was observed. The heat transfer coefficient at the nanofiber mat-coated domains was found to be an order of magnitude higher than that at the uncoated domains. Such significant enhancement of heat transfer results from the fact that nanofiber mats facilitate wetting of the surface under the passing Taylor bubbles, thus delaying formation of vapor layer at the channel bottom.
机译：为了增强强制对流沸腾过程中的热传递，微通道底部通过纳米纹理结构进行了修改-电纺聚合物纳米纤维的周期性矩形垫。纤维的直径约为几百纳米。测试流体是FC-72。微型通道中的流动包含一系列泰勒气泡。纳米纤维的作用是保持温暖的小通道底部被弄湿，以防止变干，从而提高除热率。在本实验中，发现纳米纤维涂层区域的时间平均热通量比未涂层区域的平均时间高1.6倍。因此，观察到过热显着降低（降低了5-8K）。发现在纳米纤维垫涂覆的区域处的传热系数比未涂覆的区域处的传热系数高一个数量级。传热的这种显着增强是由于以下事实：纳米纤维垫有助于在通过的泰勒气泡下润湿表面，从而延迟了通道底部蒸汽层的形成。

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  • 作者

    Martin Freystein; Felix Kolberg; Lucas Spiegel; Sumit Sinha-Ray; Rakesh P. Sahu; Alexander L. Yarin; Tatiana Gambaryan-Roisman; Peter Stephan;

  • 作者单位

    Institute of Technical Thermodynamics and Center of Smart Interfaces, Technische Universitaet Darmstadt, Alarich-Weiss-Str. 10, 64287 Darmstadt, Germany;

    Institute of Technical Thermodynamics and Center of Smart Interfaces, Technische Universitaet Darmstadt, Alarich-Weiss-Str. 10, 64287 Darmstadt, Germany;

    Institute of Technical Thermodynamics and Center of Smart Interfaces, Technische Universitaet Darmstadt, Alarich-Weiss-Str. 10, 64287 Darmstadt, Germany;

    Department of Mechanical and Industrial Engineering, University of Illinois at Chicago, Chicago, IL 60607, USA;

    Department of Mechanical and Industrial Engineering, University of Illinois at Chicago, Chicago, IL 60607, USA;

    College of Engineering, Korea University, Seoul 136-713, Republic of Korea,University of Illinois at Chicago, Department of Mechanical and Industrial Engineering, 842 W Taylor St., Chicago, IL 60607, USA;

    Institute of Technical Thermodynamics and Center of Smart Interfaces, Technische Universitaet Darmstadt, Alarich-Weiss-Str. 10, 64287 Darmstadt, Germany;

    Institute of Technical Thermodynamics and Center of Smart Interfaces, Technische Universitaet Darmstadt, Alarich-Weiss-Str. 10, 64287 Darmstadt, Germany;

  • 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 boiling; Electrospinning; Nanofibers; Taylor bubbles; Nano-textured surfaces;

    机译：流沸腾;电纺;纳米纤维;泰勒泡沫;纳米纹理表面;

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