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Viscous dissipation in micro-channels

机译：微通道中的粘性耗散

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摘要

Viscous dissipation effects in circular micro-tubes and rectangular micro-channels were investigated theoretically in a fully developed laminar flow region. From the energy conservation law, simple theoretical equations were derived for the evaluation of the viscous dissipation effect. The proposed equations were verified by comparing to other researchers’ experimental measurement and numerical results. Wall heat flux, fluid velocity, operating temperature, tube diameter, and working fluids’ effects on viscous dissipation were evaluated. It was found that viscous heating increases with decreasing aspect ratio in rectangular channels. The classical macro methods for heat transfer and pressure drop predictions agree well with the measurement and numerical predictions in micro-channels. Finally, a criterion for the evaluation of viscous dissipation was provided with the Brinkman number and heat balance concept.
机译：理论上研究了在充分发展的层流区域中圆形微管和矩形微通道中的粘性耗散效应。根据能量守恒定律，推导了简单的理论方程式，用于评估粘性耗散效应。通过与其他研究人员的实验测量和数值结果进行比较，对提出的方程进行了验证。评估了壁热通量，流体速度，工作温度，管径以及工作流体对粘性耗散的影响。发现在矩形通道中，粘性加热随着纵横比的减小而增加。用于传热和压降预测的经典宏方法与微通道中的测量和数值预测非常吻合。最后，利用布林克曼数和热平衡概念提供了一种评估粘性耗散的标准。

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