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首页> 外文期刊>International Journal of Heat and Mass Transfer >Focusing of phase change microparticles for local heat transfer enhancement in laminar flows
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Focusing of phase change microparticles for local heat transfer enhancement in laminar flows

机译：聚焦相变微粒以增强层流中的局部传热

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摘要

Phase change material (PCM) suspensions have received wide spread attention for increased thermal storage in various thermal systems such as heat sinks for electronics and solar thermal applications. To achieve further heat transfer enhancement, this paper investigates the effect of focusing micron-sized phase-change particles (PCMs) to a layer near the heated wall of a parallel plate channel. A numerical model for fully-developed laminar flow with a constant heat flux applied to one wall is developed. Melting of the focused PCMs is incorporated using a temperature-dependent effective heat capacity. The effect of channel height, height of the focused PCM stream, heat flux, and fluid properties on the peak local Nus-selt number (Nu~*) and the averaged Nusselt number over the melting length (Nu_(melt)) are investigated. Compared to the thermally-developed Nusselt number for this geometry {Nu_o = 5.385), Nu_(melt) and Nu* enhancements of 8% and 19% were determined, respectively. The local heat transfer performance is optimized when the PCMs are confined to within 30% of the channel height. The present work provides an extended understanding of local heat transfer characteristics during melting of flowing PCM suspensions, and offers a new method for enhancing heat transfer performance in various thermal-fluidic systems.
机译：相变材料（PCM）悬架在各种热系统（例如电子和太阳能热应用的散热器）中增加热存储受到了广泛的关注。为了实现进一步的传热增强，本文研究了将微米尺寸的相变粒子（PCM）聚焦到平行板通道加热壁附近的涂层上的效果。建立了充分发展的层流的数值模型，该层流在一个壁上施加了恒定的热通量。使用与温度有关的有效热容来整合聚焦的PCM。研究了通道高度，聚焦的PCM流的高度，热通量和流体特性对峰值局部Nus-selt数（Nu〜*）和平均Nusselt数在熔化长度（Nu_（melt））上的影响。与该几何形状的热显影Nusselt数（Nu_o = 5.385）相比，分别确定了8％和19％的Nu_（熔体）和Nu *增强。当PCM限制在通道高度的30％以内时，可以优化局部传热性能。本工作提供了对流动的PCM悬浮液熔化期间局部传热特性的扩展理解，并提供了一种用于增强各种热流体系统中传热性能的新方法。

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  • 作者

    Andrej Lenert; Youngsuk Nam; Bekir S. Yilbas; Evelyn N. Wang;

  • 作者单位

    Device Research Laboratory, Department of Mechanical Engineering, Massachusetts Institute of Technology, Cambridge, MA, USA;

    Device Research Laboratory, Department of Mechanical Engineering, Massachusetts Institute of Technology, Cambridge, MA, USA,Department of Mechanical Engineering, Kyung Hee University, Yongin, Korea;

    Department of Mechanical Engineering, King Fahd University of Petroleum and Minerals, Dharhan, Saudi Arabia;

    Department of Mechanical Engineering, Massachusetts Institute of Technology, 77 Massachusetts Avenue, 3-461B, Cambridge, MA 02139, USA;

  • 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

    phase-change material (PCM); melting; local heat transfer; focusing; particle distribution; mini/microchannels;

    机译：相变材料（PCM）;融化;局部传热聚焦颗粒分布迷你/微通道;

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