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An Experimental Investigation of Heat Transfer Enhancement Mechanisms in Microencapsulated Phase-Change Material Slurry Flows

机译：微胶囊相变材料浆液中传热增强机理的实验研究

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摘要

This article investigates laminar heat transfer characteristic of two-phase microencapsulated phase-change material (MPCM) suspension flows within minichannels under a constant wall heat flux boundary. Capsules containing paraffin wax with phase-change temperature between 36.1℃ and 38.1℃ are examined and found to be well suited for electronics cooling applications using liquid cold plate technologies. In particular, it is shown that the large thermal capacity of MPCM slurries around the phase-change temperature can lead toward greater isothermality of isoflux systems, a characteristic of significant interest to telecommunication, laser and biomedical applications. The principal focus of the study is to examine heat transfer characteristics within standard tube flow geometries, quantify the heat transfer augmentation/degradation observed, and finally, elucidate the mechanisms from which these result. Through the study volume concentrations of the MPCM slurry were varied between 0% and 30.2%. High-resolution local heat transfer measurements were obtained using infrared thermography and results presented in terms of local Nusselt number versus inverse Graetz parameter. These spanned both the thermal entrance and the fully developed flow regions with inverse Graetz number ranging from 10~(-1) to 10°. Results show that significant heat transfer enhancements are attainable via the use of MPCM slurries over conventional single-phase coolants. Overall, the study highlights mechanisms that lead to significant heat transfer enhancements in heat exchange devices employing microencapsulated phase-change material slurries.
机译：本文研究了在恒定壁热通量边界下，微通道内两相微囊化相变材料（MPCM）悬浮液的层流传热特性。对包含相变温度在36.1℃至38.1℃之间的石蜡的胶囊进行了检查，发现它们非常适合使用液体冷板技术进行电子冷却应用。特别地，显示出相变温度附近的MPCM浆液的大热容量可导致等通量系统的更大的等温性，这是电信，激光和生物医学应用的重要特征。该研究的主要重点是检查标准管流几何形状内的传热特性，量化观察到的传热增加/降解，最后阐明产生这些现象的机理。通过研究，MPCM浆料的体积浓度在0％和30.2％之间变化。使用红外热像仪可获得高分辨率的局部传热测量结果，并以局部Nusselt数与Graetz逆参数的关系表示结果。它们跨越热入口和完全展开的流动区域，其反格拉茨数在10〜（-1）到10°之间。结果表明，与传统的单相冷却剂相比，通过使用MPCM浆料可以显着提高传热效果。总体而言，该研究重点介绍了导致采用微囊化相变材料浆料的热交换设备中传热显着增强的机理。

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  • 来源
    《Heat Transfer Engineering》 |2013年第3期|223-234|共12页
  • 作者

    JAMES A. HOWARD; PATRICK A. WALSH;

  • 作者单位

    Department of Mechanical, Aeronautical and Biomedical Engineering, Stokes Institute, University of Limerick, Castletroy, Limerick, Ireland;

    Department of Civil Engineering & Materials Science, Stokes Institute, University of Limerick, Limerick, Ireland;

  • 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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