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Physical Effects of Variable Thermophysical Fluid Properties on Flow and Thermal Development in Micro-Channel

机译：可变热物理流体性质对微通道流动和热发展的物理影响

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摘要

Micro-scale cooling is an efficient and effective cooling technique to achieve the goal of higher heat removal capabilities. The present research focuses to find the physical effects of fluid property variations on flow and thermal development in micro-channel. The effects of temperature-dependent density, viscosity, and thermal conductivity variations on single-phase laminar forced convection are numerically investigated. The problem is especially simulated for hydrodynamically and thermally developing water flow in micro-channel with no-slip, no-temperature jump, and constant wall heat flux boundary conditions. It is observed that the density variation induces radially inward flow due to continuity, which sharpens the axial velocity profile and decreases Nusselt number compared to constant property solution. The axial velocity profile significantly alters due to viscosity variation. This alteration varies along the micro-flow and it induces radially flow due to flow continuity. The reducing rate of Nusselt number for viscosity variation is substantially lower than constant property solution due to a significant flattening effect of the axial velocity profile, which augments the Nusselt number. Thermal-conductivity variation across the flow induces radial conduction, which enhances convection compared to constant property solution. Additionally, the effects of thermophysical fluid property variations on static gauge pressure drop are also investigated.
机译：微型冷却是一种高效的冷却技术，可以达到更高的散热能力。本研究着重于发现流体性质变化对微通道内流动和热发展的物理影响。数值研究了温度依赖性密度，粘度和导热系数变化对单相层流强迫对流的影响。对于在无滑移，无温度跃变和恒定壁热通量边界条件的微通道中，以流体动力和热力开发水流的问题尤其得到了模拟。可以看出，由于连续性，密度变化引起径向向内流动，与恒定特性解决方案相比，它使轴向速度分布锐化并减少了Nusselt数。轴向速度曲线由于粘度变化而显着改变。这种变化沿微流变化，并且由于流的连续性而引起径向流。由于轴向速度曲线的显着扁平化效果（增加了Nusselt数），用于粘度变化的Nusselt数减少率大大低于恒定特性解决方案。与恒定特性解决方案相比，整个流体的热导率变化会引起径向传导，从而增强对流。此外，还研究了热物理流体特性变化对静压力表压降的影响。

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  • 来源
    《Heat Transfer Engineering》 |2018年第4期|374-390|共17页
  • 作者

    Rajan Kumar; Shripad P. Mahulikar;

  • 作者单位

    School of Engineering, Indian Institute of Technology, Mandi, Himachal Pradesh, India;

    Department of Aerospace Engineering, Indian Institute of Technology, Bombay, Mumbai, India;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);
  • 原文格式 PDF
  • 正文语种 eng
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