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Heat transfer and pressure drop characteristics of R134a flow boiling in the parallel/tandem microchannel heat sinks

机译：并联/串联微通道散热器中R134a流动沸腾的传热和压降特性

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摘要

With the rapid development of integrated electronic devices, microchannel heat sinks cooling system containing two heat sinks in parallel or in series has been established, for the purpose of meeting the demand of removing high heat fluxes from multi-heat sources in small space. Using refrigerant R134a as working fluid, the flow boiling characteristics of R134a and the mutual influences between the microchannel heat sinks were investigated experimentally under dynamic and stable conditions to evaluate the feasibility of this cooling system applied to engineering. The heat sinks were connected in parallel or in series, each of them consisting of 21 microchannels with hydraulic diameter of 0.5 mm. For heat sinks in parallel, pressure drop of the heat sink in subcooled boiling changed and eventually resulted in uneven mass flux distribution, where flow rate of the heat sink became less than 0.4 L/min and the total volume flow rate stabilized at 0.8 L/min. Correlations for heat transfer coefficients and friction factors of single heat sink in single-phase convective flow and subcooled flow boiling were proposed, providing acceptable predictions with mean absolute errors less than 8%. Based on the correlations, a steady-state mathematical model was established to describe the steady-state characteristics of parallel microchannel heat sinks. For heat sinks in series, temperature of upstream heat sink remained constant except for the moment phase change occurred in downstream heat sink with outlet and wall temperature of the upstream one jumping by 0.5 degrees C and 0.1 degrees C respectively. The results indicated that downstream effects on the upstream were weak. But phase transition of upstream heat sink affected heat transfer of downstream heat sink more intensely, with inlet, outlet and wall temperature of the downstream one decreasing by 2.5 degrees C. The cooling system proposed has the advantages of compact structure, simple connection, cost-saving, easy-maintenance and reliable operation. The experimental results have guiding significance for solving heat dissipation problem of high heat flux electronic devices with multi-heat sources. (C) 2017 Elsevier Ltd. All rights reserved.
机译：随着集成电子设备的飞速发展，已经建立了包含两个并联或串联的散热器的微通道散热器冷却系统，以满足在狭小空间中从多个热源中去除高热通量的需求。以制冷剂R134a为工作液，在动态和稳定的条件下，对R134a的沸腾特性和微通道散热器之间的相互影响进行了实验研究，以评价该冷却系统在工程上的可行性。散热器并联或串联连接，每个散热器由21个微通道组成，水力直径为0.5毫米。对于并联的散热器，散热器在过冷沸腾中的压降发生了变化，并最终导致质量流量分布不均匀，其中散热器的流量小于0.4 L / min，总体积流量稳定在0.8 L / min分钟提出了单相对流流动和过冷流动沸腾中单个散热器的传热系数和摩擦系数的相关性，提供了可接受的预测，平均绝对误差小于8％。基于相关性，建立了一个稳态数学模型来描述并联微通道散热器的稳态特性。对于串联的散热器，上游散热器的温度保持恒定，除了在下游散热器中发生相变的瞬间，上游散热器的出口和壁温分别跃升了0.5摄氏度和0.1摄氏度。结果表明，下游对上游的影响较弱。但是上游散热片的相变对下游散热片的传热影响更大，下游散热片的入口，出口和壁温降低了2.5摄氏度。所提出的冷却系统具有结构紧凑，连接简单，成本低廉的优点。节省，易于维护且运行可靠。实验结果对解决多热源高热通量电子器件的散热问题具有指导意义。 （C）2017 Elsevier Ltd.保留所有权利。

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  • 来源
    《Energy Conversion & Management》 |2017年第9期|1082-1095|共14页
  • 作者

    Zhang Yaxian; Wang Jingtao; Liu Wei; Liu Zhichun;

  • 作者单位

    Huazhong Univ Sci & Technol, Sch Energy & Power Engn, Wuhan 430074, Hubei, Peoples R China;

    Huazhong Univ Sci & Technol, Sch Energy & Power Engn, Wuhan 430074, Hubei, Peoples R China;

    Huazhong Univ Sci & Technol, Sch Energy & Power Engn, Wuhan 430074, Hubei, Peoples R China;

    Huazhong Univ Sci & Technol, Sch Energy & Power Engn, Wuhan 430074, Hubei, Peoples R China;

  • 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

    Microchannel heat sinks; Multi-heat sources; Parallel; Series; Experiment;

    机译：微通道散热器;多热源;并联;系列;实验;

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