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Scaling Effects for Liquid Flows in Microchannels

机译：微通道中液体流动的比例效应

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摘要

Many experimental works on the forced convection through microchannels seem to show that when the hydraulic diameter is less than 1 mm, the conventional theory can no longer be considered suitable to predict the pressure drop and convective heat transfer coefficients. This conclusion seemed valid for both gas and liquid flows. Sometimes the authors justified this claim by invoking "new" micro-effects. In the last few years, this conclusion seems to be controverted by additional, more accurate experimental data. For this reason, the explanation of the experimental results obtained for microchannels in terms of friction factors and convective heat transfer in the laminar regime is sought for within the bonds of the conventional theory. In particular, this study focuses on the role of viscous heating in liquids flowing through microchannels, considering them as scaling effects. The role of the cross-sectional geometry on the viscous heating is highlighted for adiabatic and diabatic channels. Design correlations that are useful in defining the limit of significance of the most important scaling effects for microchannels, such as viscous heating and conjugate heat transfer, are also presented.
机译：关于通过微通道进行强制对流的许多实验工作似乎表明，当水力直径小于1 mm时，常规理论不再被认为适合于预测压降和对流传热系数。这个结论似乎对气体和液体流动都是有效的。有时，作者通过援引“新”微观效应来证明这一主张是正确的。在过去的几年中，这一结论似乎被更多，更准确的实验数据所争议。因此，在常规理论的约束范围内寻求对层状区域中微通道摩擦系数和对流传热的实验结果的解释。特别地，本研究着重于粘性加热在流经微通道的液体中的作用，并将其视为结垢效应。对于绝热和绝热通道，突出了横截面几何形状在粘性加热中的作用。还介绍了一些设计相关性，这些相关性可用于定义微通道最重要的缩放效果（例如粘性加热和共轭传热）的显着性极限。

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  • 来源
    《Heat Transfer Engineering》 |2006年第4期|p.64-73|共10页
  • 作者

    GIAN LUCA MORINI;

  • 作者单位

    DIENCA, Universita Di Bologna, Viale Risorgimento 2 40136 Bologna, Italy;

  • 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
  • 中图分类 工业用热工设备;
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