首页> 外文期刊>International Journal of Heat and Mass Transfer >Combined influences of viscous dissipation, non-uniform Joule heating and variable thermophysical properties on convective heat transfer in microtubes
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Combined influences of viscous dissipation, non-uniform Joule heating and variable thermophysical properties on convective heat transfer in microtubes

机译:粘性耗散,不均匀的焦耳加热和可变的热物理性质对微管中对流传热的综合影响

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摘要

This study presents a comprehensive investigation on hydrodynamic and thermal transport properties of mixed electroosmotically and pressure driven flow in microtubes. Particular emphasis is given to investigating the combined consequences of viscous dissipation, non-uniform Joule heating, and variable thermophysical properties. Analytical solutions are obtained using the Debye-Hiickel linearization and constant fluid properties assumption, while a numerical solution is presented for variable fluid properties and non-uniform distribution of Joule heating. The results indicate that, viscous heating effect is pronounced significantly when a favorable pressure gradient exists and cannot be neglected at low values of the dimensionless Debye-Hiickel parameter. Moreover, uniform Joule heating assumption, even at low zeta potentials, may reduce the accuracy of the predicted thermal features considerably. The wall shear stress is found to be strongly dependent upon the zeta potential, which is underestimated by the Debye-Huckel linearization. Compared with the constant fluid properties case, decreasing electrical resistivity of the fluid by increasing temperature, amplifies the total energy generation due to the Joule heating and reduces the Nusselt number.
机译:本研究对微管中混合电渗流和压力驱动流的水动力和热传输特性进行了全面研究。特别强调研究粘性耗散,焦耳加热不均匀和热物理性质可变的综合后果。解析解是使用Debye-Hiickel线性化和恒定流体性质假设获得的,而数值解决方案是针对可变流体性质和焦耳加热的非均匀分布提供的。结果表明,当存在有利的压力梯度时,粘性加热效果显着,而在无因次Debye-Hiickel参数的低值下不能忽略。此外,即使在低zeta电位下,均匀的焦耳加热假设也可能会大大降低预测的热特征的准确性。发现壁切应力强烈依赖于zeta电位,这被Debye-Huckel线性化低估了。与恒定流体属性的情况相比,通过增加温度来降低流体的电阻率,会由于焦耳热而放大总能量生成,并减少Nusselt数。

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