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Effects of a High Porous Material on Heat Transfer and Flow in a Circular Tube

机译：高多孔材料对圆管内传热和流动的影响

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摘要

This paper describes the heat transfer and flow characteristics of a heat exchanger tube filled with a high porous material. Fine copper wires (diameter: 0.5 mm) were inserted in a circular tube dominated by thermal conduction and forced convection. The porosity was from 0.98 to 1.0. The working fluid was air. The hydraulic equivalent diameter was cited as the characteristic length in the Nusselt number and the Reynolds number. The Nusselt number and the friction factor were expressed as functions of the Reynolds number and porosity. The thermal performance was evaluated by the ratio of the Nusselt number with and without a high porous material and the entropy generation. It was recognized that the high porous material was effective in low Reynolds numbers and the Reynolds number, which minimized the entropy generation existed.
机译：本文介绍了填充有高多孔材料的热交换器管的传热和流动特性。将细铜线（直径：0.5 mm）插入以导热和强制对流为主的圆管中。孔隙率为0.98至1.0。工作流体是空气。水力当量直径作为努氏数和雷诺数的特征长度被引用。努塞尔数和摩擦系数表示为雷诺数和孔隙率的函数。通过具有和不具有高多孔材料的努塞尔数之比和熵产生来评估热性能。已经认识到，高多孔材料对低雷诺数有效，并且存在使熵产生最小化的雷诺数。

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  • 来源
    《Journal of Heat Transfer》 |2009年第2期|024503.1-024503.4|共4页
  • 作者

    Koichi Ichimiya; Tetsuaki Takeda; Takuya Uemura; Tetsuya Norikuni;

  • 作者单位

    Interdisciplinary Graduate School of Medicine and Engineering, Mechanical Systems Engineering Division, University of Yamanashi, Takeda-4, Kofu, Yamanashi 400-8511, Japan;

    Interdisciplinary Graduate School of Medicine and Engineering, Mechanical Systems Engineering Division, University of Yamanashi, Takeda-4, Kofu, Yamanashi 400-8511, Japan;

    Yamatake Co Ltd., Marunouchi, Chiyoda, Tokyo 100-6419, Japan;

    Tekumo Co Ltd., Fujisawa, Kanagawa 252-0815, Japan;

  • 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

    porous medium; heat transfer enhancement; thermal performance; entropy generation;

    机译：多孔介质传热增强;热性能熵产生;

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