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首页> 外文期刊>Journal of Heat Transfer >Contact Resistance Measurement and Its Effect on the Thermal Conductivity of Packed Sphere Systems
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Contact Resistance Measurement and Its Effect on the Thermal Conductivity of Packed Sphere Systems

机译：接触电阻测量及其对填充球系统导热系数的影响

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摘要

There has been a growing interest in porous systems with a smaller length-scale modeling requirement on the order of each particle, where the existing tools tend to be inadequate. To address this, a Discrete Conduction Model was recently proposed to allow for the transient temperature calculation of 3D random packed-sphere systems for various microstructures. Since many of the motivating applications involve contacting spheres and since there has been a limited number of contact-resistance studies on spheres undergoing elastic deformation, the objective of this study is to obtain measurements of the contact resistances between metallic spheres in elastic contact, as well as to quantify their influence on the effective thermal conductivity. To accomplish this, an experiment was constructed utilizing air and interfacial resistance to replace the functions of the guard heater and vacuum chamber, and in so doing, enabled transient observations. The overall uncertainty was estimated to be ? 6%, and the results were benchmarked against available data. A correlation was obtained relating the contact resistance with the contact radius, and results showed the contact resistance to have minimal transient behavior. The results also showed that the neglect of contact resistance could incur an error in the effective thermal conductivity calculation as large as 800%, and a guideline was presented under which the effect of the contact resistance may be ignored. A correlation accounting for the effect of contact resistance on the effective thermal conductivity was also presented.
机译：人们对多孔系统的兴趣日益增长，而多孔系统对每个粒子的阶次长度建模要求较小，而现有的工具往往不足。为了解决这个问题，最近提出了一种离散传导模型，可以对各种微结构的3D随机填充球体系统进行瞬态温度计算。由于许多激励应用都涉及接触球，并且对进行弹性变形的球的接触电阻研究数量有限，因此该研究的目的是获得弹性接触的金属球之间的接触电阻的测量值。以量化它们对有效导热系数的影响。为此，利用空气和界面阻力构建了一个实验，以替代防护加热器和真空室的功能，从而实现了瞬态观察。总体不确定性估计为？ 6％，并将结果与​​可用数据进行基准比较。获得了将接触电阻与接触半径相关的相关性，结果表明接触电阻具有最小的瞬态行为。结果还表明，忽略接触电阻会导致有效导热系数计算中的误差高达800％，并提出了可以忽略接触电阻影响的准则。还提出了一种解释接触电阻对有效导热率影响的相关性。

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  • 来源
    《Journal of Heat Transfer》 |2004年第6期|p.886-895|共10页
  • 作者

    W. W. M. Siu; S. H.-K. Lee;

  • 作者单位

    Department of Mechanical Engineering, Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong Kong;

  • 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 热力工程、热机;
  • 关键词

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