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An evaiuation of secondary effects on microchannel frictional and convective heat transfer characteristics

机译:评估对微通道摩擦和对流传热特性的次要影响

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摘要

The frictional and convective heat transfer characteristics of rarified flows in rectangular microchannels, with either isoflux or isothermal boundary conditions, are evaluated subject to second-order slip boundary conditions, creep flow, viscous dissipation, and axial conduction effects. Numerical results are obtained using a continuum based, three-dimensional, compressible, unsteady computational fluid dynamics algorithm with first- and second-order slip velocity and temperature jump boundary conditions applied to the momentum and energy equations, respectively. The results, reported in the form of Poiseuille and Nusselt numbers, are found to be significant functions of aspect ratio, Knudsen number, slip model parameters, Brinkman number, and Peclet number.
机译:矩形微通道中稀疏流动的摩擦和对流传热特性(具有等流量或等温边界条件)在二阶滑移边界条件,蠕变流,粘性耗散和轴向传导效应的作用下进行了评估。使用基于连续性的,可压缩的,非定常的三维计算流体动力学算法,将一阶和二阶滑移速度和温度跃变边界条件分别应用于动量和能量方程,可以获得数值结果。结果以Poiseuille和Nusselt数的形式报告,被发现是纵横比,Knudsen数,滑模模型参数,Brinkman数和Peclet数的重要函数。

著录项

  • 来源
    《International Journal of Heat and Mass Transfer》 |2009年第12期|2792-2801|共10页
  • 作者

    J. van Rij; T. Ameel; T. Harman;

  • 作者单位

    Department of Mechanical Engineering, University of Utah, Salt Lake City, UT 84112, USA;

    Department of Mechanical Engineering, University of Utah, Salt Lake City, UT 84112, USA;

    Department of Mechanical Engineering, University of Utah, Salt Lake City, UT 84112, 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

    rarified flow; viscous dissipation; axial conduction;

    机译:稀疏流粘性耗散;轴向传导;

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