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首页> 外文期刊>Heat Transfer Engineering >Modeling and Analysis of Flow, Thermal, and Energy Fields Within Stacks of Thermoacoustic Engines Filled With Porous Media
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Modeling and Analysis of Flow, Thermal, and Energy Fields Within Stacks of Thermoacoustic Engines Filled With Porous Media

机译：充满多孔介质的热声发动机烟囱内流场，热场和能量场的建模与分析

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摘要

For this article, an analytical study has been conducted on the flow and energy transfer of unsteady compressible oscillating flow through channels filled with porous medium representing stack in thermoacoustic engines/refrigerators. The flow in the porous material is described by the Darcy momentum equation. Analytical expressions for oscillating velocity, temperature in the porous layer, complex Nusselt number, and energy flux density are obtained after simplifying and solving the governing differential equations with reasonable approximations (such as long wave, short stack, small amplitude oscillation, etc.). The result for heat transfer between the porous medium and the channel wall is expressed as a dimensionless Nusselt number. For the limiting case of nonporous medium, the Nusselt number obtained in the present study matches quantitatively with the expression available in the existing literature. The results reveal that the Nusselt number in oscillating flow is significantly enhanced (almost an order of magnitude) by employing sufficiently large thermal conductivity of porous media in a channel. The system of equations developed in the present study is a helpful tool for thermal engineers to design porous stacks for thermoacoustic devices.
机译：对于本文，已经进行了关于非稳态可压缩振荡流通过填充有多孔介质的通道的流动和能量转移的研究，该介质代表了热声发动机/制冷机中的烟囱。多孔材料中的流动由达西动量方程式描述。在以合理的近似值（例如长波，短叠层，小振幅振荡等）简化并求解了控制微分方程后，获得了振动速度，多孔层中的温度，复数努塞尔数和能量通量密度的解析表达式。多孔介质和通道壁之间的传热结果表示为无量纲的努塞尔数。对于无孔介质的极限情况，本研究中获得的努塞尔数与现有文献中可用的表达定量匹配。结果表明，通过在通道中采用足够大的多孔介质导热率，振荡流中的努塞尔数得到了显着提高（几乎一个数量级）。在本研究中开发的方程系统是热工程师设计热声器件的多孔堆栈的有用工具。

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  • 来源
    《Heat Transfer Engineering》 |2013年第3期|84-97|共14页
  • 作者

    SYEDA HUMAIRA TASNIM; SHOHEL MAHMUD; ROYDON ANDREW FRASER;

  • 作者单位

    Department of Mechanical and Mechatronics Engineering, University of Waterloo, Waterloo, Ontario, Canada;

    Mechanical Engineering Program, School of Engineering, University of Guelph, Thornbrough Building Rm 218, Guelph, ON, N1G 2W1 Canada;

    Department of Mechanical and Mechatronics Engineering, University of Waterloo, Waterloo, Ontario, Canada;

  • 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);
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  • 正文语种 eng
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