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Forced Convection Analysis of Discrete Heated Porous Convergent Channel

机译：离散加热多孔收敛通道的强迫对流分析

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摘要

This study investigates numerically forced convection heat transfer and flow analyses of a passive heat exchanger for nonporous and partially filled porous channels with varying exit height (1, 0.5, and 0.25). Four discrete heat sources with uniform heat flux are simulated on the channel bottom wall. The partially filled porous channels are tested at two different porous block heights (0.5 and 1). The flow field and thermal analyses inside the channels are investigated across a wide range of Reynolds and Darcy numbers for Prandtl number ofO. 71. The results reveal that the porous block and the exit height affect substantially the flow and heat transfer characteristics inside the tested channels. The Nusselt number is enhanced by 20-40% for the partially filled porous convergent channel (exit height = 0.25 and porous block height = 1) compared to the nonporous channel. Consequently, the heat exchanger size can be reduced by 37.5%. Moreover, the overall heat transfer performance parameter is enhanced with further increase in Darcy number at low Reynolds number. As a result, compact heat exchangers that provide superior heat transfer coefficients lead to development of macro- and microelectronic devices.
机译：这项研究调查了无源和部分填充的多孔通道（出口高度不同（1、0.5和0.25））的被动换热器的数值对流换热和流动分析。在通道底壁上模拟了四个具有均匀热通量的离散热源。在两个不同的多孔块高度（0.5和1）下测试部分填充的多孔通道。通道内的流场和热分析在广泛的雷诺数和达西数（Prandtl数为O）下进行了研究。 71.结果表明，多孔块和出口高度会实质上影响被测通道内部的流动和传热特性。与无孔通道相比，部分填充的多孔收敛通道（出口高度= 0.25和多孔块高度= 1）的Nusselt值提高了20-40％。因此，热交换器的尺寸可以减小37.5％。此外，在低雷诺数下，随着达西数的进一步增加，总的传热性能参数得以提高。结果，提供优异的热传递系数的紧凑型热交换器导致了宏观和微电子设备的发展。

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  • 来源
    《Heat Transfer Engineering》 |2015年第11期|829-846|共18页
  • 作者

    MOHAMED G. GHORAB;

  • 作者单位

    Department of Mechanical Power Engineering, Alexandria University, Alexandria 21544, Egypt;

  • 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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