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首页> 外文期刊>Journal of Heat Transfer >Large Convective Heat Transfer Enhancement in Microchannels With a Train of Coflowing Immiscible or Colloidal Droplets
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Large Convective Heat Transfer Enhancement in Microchannels With a Train of Coflowing Immiscible or Colloidal Droplets

机译：大量的对流不混溶或胶体微滴增强微通道中的大对流传热

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摘要

We show that heat transfer in microchannels can be considerably augmented by introducing droplets or slugs of an immiscible liquid into the main fluid flow. We numerically investigate the influence of differently shaped colloidal or simply pure immiscible droplets to the main liquid flow on the thermal transport in microchannels. Results of parametric studies on the influence of all major factors connected to microchannel heat transfer are presented. The effect of induced Marangoni flow at the liquid interfaces is also taken into account and quantified. The calculation of the multiphase, multispecies flow problem is performed, applying a front tracking method, extended to account for nanoparticle transport in the suspended phase when relevant. This study reveals that the use of a second suspended liquid (with or without nanoparticles) is an efficient way to significantly increase the thermal performance without unacceptably large pressure losses. In the case of slug-train coflow, the Nusselt number can be increased by as much as 400% compared with single liquid flow.
机译：我们表明，通过将不混溶液体的液滴或团块引入主流体流，可以显着增强微通道中的热传递。我们在数值上研究了不同形状的胶体或简单的纯不混溶液滴对主要液体流对微通道中热传递的影响。提出了与微通道传热有关的所有主要因素影响的参数研究结果。还考虑并量化了在液体界面处引起的马兰戈尼流的影响。应用前跟踪方法进行多相，多物种流动问题的计算，并在相关时扩展为考虑到悬浮相中的纳米颗粒传输。这项研究表明，使用第二种悬浮液体（有或没有纳米颗粒）是有效提高热性能而又不会造成不可接受的巨大压力损失的有效方法。在团状顺流的情况下，与单一液体流相比，Nusselt数最多可以增加400％。

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  • 来源
    《Journal of Heat Transfer》 |2010年第11期|p.112402.1-112402.10|共10页
  • 作者

    Magnus Fischer; Damir Juric; Dimos Poulikakos;

  • 作者单位

    Laboratory of Thermodynamics in Emerging Technologies,Institute of Energy Technology,Department of Mechanical and Process Engineering,ETH Zuerich,8092 Zuerich, Switzerland;

    rnLaboratoire d'Informatique pour la Mecanique et les Sciences de I'lnge'nieur (LIMSI),Centre National de la Recherche Scientifique (CNRS),UPR 3251, BP133,91403 Orsay Cedex, France;

    rnLaboratory of Thermodynamics in Emerging Technologies,Institute of Energy Technology,Department of Mechanical and Process Engineering,ETH Zuerich,8092 Zuerich, Switzerland;

  • 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

    nanofluid; colloidal suspensions; thermal transport; marangoni effect; droplet-laden flow; segmented flow; immiscible fluids;

    机译：纳米流体胶体悬浮液;热传输;马兰戈尼效应液滴流动分段流不混溶的液体;

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