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首页> 外文期刊>Journal of Heat Transfer >Impact of Particulate Deposition on the Thermohydraulic Performance of Metal Foam Heat Exchangers: A Simplified Theoretical Model
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Impact of Particulate Deposition on the Thermohydraulic Performance of Metal Foam Heat Exchangers: A Simplified Theoretical Model

机译：颗粒沉积对金属泡沫热交换器热工水力性能的影响：简化的理论模型

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摘要

Assuming uniform particulate deposit layer, with deposition layer thickness in the range of 10-400 μm, on the ligaments of a metal foam heat sink, the effects of airborne particle deposition on the steady-state thermohydraulic performance of a metal foam heat sink are examined theoretically. Using a cubic cell model, changes in the foam internal structure, due to deposition, have been theoretically related to the increased pressure drop due to partial blockage of the pores. Our results suggest that the fouled to clean pressure drop ratio is only a function of the ligament to pore diameter ratio. Another interesting observation is that, compared to clean foams, the pressure drop can increase by orders of magnitude depending on the extent to which the pores are blocked. To examine the fouling effects on heat transfer from the foams, a thermal resistance network has been used. Moreover, the heat transfer from metal foams is more affected by fouling at higher fluid velocities. For example, when air is pushed through foams which their ligaments are uniformly covered by particles at 3 mis, up to 15% decrease in the total heat transfer from the heated surface is predicted.
机译：假设在金属泡沫散热器的韧带上沉积层厚度在10-400μm范围内的均匀颗粒沉积层，研究了气载颗粒沉积对金属泡沫散热器稳态热工水力性能的影响理论上。使用立方孔模型，由于沉积，泡沫内部结构的变化在理论上已经与由于孔的部分阻塞而导致的压力下降增加有关。我们的结果表明，结垢与干净的压降之比仅是韧带与孔径之比的函数。另一个有趣的观察结果是，与干净的泡沫相比，压降会增加几个数量级，具体取决于孔被阻塞的程度。为了检查结垢对泡沫传热的影响，已使用了热阻网络。而且，在较高的流体速度下，结垢对金属泡沫的传热影响更大。例如，当空气被推动通过其韧带均匀地被3 mis的颗粒覆盖的泡沫时，从加热表面传递的总热量将减少多达15％。

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  • 来源
    《Journal of Heat Transfer》 |2012年第9期|p.092601.1-092601.7|共7页
  • 作者

    K. Hooman; A. Tamayol; M. R. Malayeri;

  • 作者单位

    School of Mechanical and Mining Engineering, The University of Queensland, Brisbane QLD 4072, Australia;

    School of Engineering Science, Simon Fraser University, Vancouver, BC, 1111, Canada;

    Institute of Thermodynamics and Thermal Engineering, University of Stuttgart, 70550 Stuttgart, Germany;

  • 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

    metal foams; forced convection; parametric study; thermal resistors; dust;

    机译：金属泡沫;强制对流参数研究热敏电阻;灰尘;

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