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Effect of viscous heating on heat transfer performance in microchannel slip flow region

机译:粘性加热对微通道滑流区传热性能的影响

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摘要

Based on the superposition principle, an analytical solution tor steady convective heat transfer in a two-dimensional microchannel in the slip flow region is obtained, including the effects of velocity slip and temperature jump at the wall, which are the main characteristics of flow in the slip flow region, and viscous heating effects in the calculations. The cases of constant heat flux boundary conditions and one wall as adiabatic and the other wall at constant heat flux input are studied. The solution method is verified for the cases where micro-scale effects are neglected. The effects of viscous heating on the temperature profiles and on the heat transfer performance are analyzed in detail. It is concluded that the effect of viscous heating, like an internal energy source, heats the fluid along the flow direction and severely distorts the temperature profiles. The effects of key parameters, such as the Brinkman and Knud-sen numbers, on the Nusselt number, which expresses the heat transfer performance are investigated.
机译:基于叠加原理,获得了滑流区域二维微通道内稳态对流换热的解析解,包括壁面速度滑移和温度跃变的影响,这是流场内流动的主要特征。计算中的滑流区域和粘性加热效应。研究了恒定热通量边界条件的情况,其中一壁为绝热,另一壁为恒定热通量输入。对于忽略了微观尺度效应的情况,验证了该解决方法。详细分析了粘性加热对温度分布和传热性能的影响。结论是,像内部能源一样,粘性加热的作用会沿流动方向加热流体,并严重扭曲温度分布。研究了关键参数(如Brinkman和Knud-sen数)对表示传热性能的Nusselt数的影响。

著录项

  • 来源
    《International Journal of Heat and Mass Transfer》 |2010年第22期|p.4927-4934|共8页
  • 作者单位

    School of Mechanical and Electronic Control Engineering, Beijing Jiaotong University, Beijing 100044, China Department of Mechanical and Aerospace Engineering, Rutgers University, Piscataway, N] 08854, USA;

    rnSchool of Mechanical and Electronic Control Engineering, Beijing Jiaotong University, Beijing 100044, China;

    rnSchool of Mechanical and Electronic Control Engineering, Beijing Jiaotong University, Beijing 100044, China;

    Department of Mechanical and Aerospace Engineering, Rutgers University, Piscataway, N] 08854, USA;

  • 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

    microchannel; heat transfer; superposition principle; viscous heating; slip flow; temperature jump;

    机译:微通道传播热量;叠加原理粘性加热;滑流温度跳跃;

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