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首页> 外文期刊>International Journal of Heat and Mass Transfer >Theoretical-experimental analysis of conjugated heat transfer in nanocomposite heat spreaders with multiple microchannels
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Theoretical-experimental analysis of conjugated heat transfer in nanocomposite heat spreaders with multiple microchannels

机译：具有多个微通道的纳米复合材料散热器中共轭传热的理论-实验分析

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摘要

The present work deals with conjugated heat transfer in heat spreaders made of a nanocomposite substrate with longitudinally molded multiple straight micro-channels. An experimental analysis is undertaken to validate a recently proposed methodology for the solution of conjugated conduction-convection heat transfer problems, which are often of relevance in thermal micro-systems analysis, based on a single domain formulation and solution of the resulting problem through integral transforms. The single domain formulation simultaneously models the heat transfer phenomena at both the fluid streams and the channels walls by making use of coefficients represented as space variable functions with abrupt transitions occurring at the fluid-wall interfaces. The Generalized Integral Transform Technique (GITT) is then employed in the hybrid numerical-analytical solution of the resulting convection-diffusion problem with variable coefficients. The experimental investigation involves the determination of the surface temperature distribution over the heat spreader with the molded microchannels that exchange heat with the base plate by flowing hot water at a prescribed mass flow rate. The infrared thermography technique is employed to investigate the response of the heat spreader surface temperature to a hot inlet fluid flow, aiming at the analysis of micro-systems that provide a thermal response from either their normal operation or due to a promoted stimulus for characterization purposes.
机译：本工作涉及由纳米复合材料基材制成的散热器中的共轭传热，该基材具有纵向模制的多个直的微通道。进行了实验分析，以验证最近提出的用于解决共轭传导-对流传热问题的方法，该方法通常在热微系统分析中具有重要意义，它基于单域公式并通过积分变换解决了所产生的问题。单域公式通过利用表示为空间变量函数的系数同时在流体-壁界面处发生突然转变来同时模拟流体流和通道壁处的传热现象。然后将广义积分变换技术（GITT）用于所产生的变系数对流扩散问题的混合数值解析解。实验研究涉及确定带有成型微通道的散热器表面温度分布，这些微通道通过以规定的质量流量使热水流动来与基板进行热交换。红外热成像技术用于研究散热器表面温度对入口热流体的响应，其目的是分析微型系统，这些系统会因其正常运行或由于用于表征目的而受到刺激而产生热响应。

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  • 来源
  • 作者

    Diego C. Knupp; Carolina P. Naveira-Cotta; Renato M. Cotta;

  • 作者单位

    Laboratory of Experimentation and Numerical Simulation in Heat and Mass Transfer, LEMA, Dept. of Mechanical Engineering and Energy, Instituto Politecnico, IPRJ/UERJ, Rua Bonfim, 25, Nova Friburgo, RJ CEP 28624-570, Brazil;

    Laboratory of Nano- and Microfluidics and Microsystems, LabMEMS, Laboratory of Transmission and Technology of Heat, LTTC, Mechanical Engineering Dept. & Nanoengineering Dept. - POLI&COPPE, UFRJ, Universidade Federal do Rio de Janeiro, Cidade Universitaria, Cx. Postal 68503, Rio de Janeiro, RJ CEP 21945-970, Brazil;

    Laboratory of Nano- and Microfluidics and Microsystems, LabMEMS, Laboratory of Transmission and Technology of Heat, LTTC, Mechanical Engineering Dept. & Nanoengineering Dept. - POLI&COPPE, UFRJ, Universidade Federal do Rio de Janeiro, Cidade Universitaria, Cx. Postal 68503, Rio de Janeiro, RJ CEP 21945-970, Brazil;

  • 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

    Conjugated problem; Microchannels; Micro-heat exchanger; Hybrid methods; Integral transforms; Infrared thermography;

    机译：共轭问题;微通道;微型热交换器;混合方法;积分变换;红外热成像;

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