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首页> 外文期刊>International Journal of Heat and Mass Transfer >Viscous dissipation effects on thermal transport characteristics of combined pressure and electroosmotically driven flow in microchannels
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Viscous dissipation effects on thermal transport characteristics of combined pressure and electroosmotically driven flow in microchannels

机译：粘性耗散对微通道中组合压力和电渗流的热传递特性的影响

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摘要

This study investigates the influence of viscous dissipation on thermal transport characteristics of the fully developed combined pressure and electroosmotically driven flow in parallel plate microchannels subject to uniform wall heat flux. Closed form expressions are obtained for the transverse distributions of electrical potential, velocity and temperature and also for Nusselt number. From the results it is realized that the Brinkman number has a significant effect on Nusselt number. Generally speaking, to increase Brinkman number is to decrease Nusselt number. Although the magnitude of Joule heating can affect Brinkman number dependency of Nusselt number, however the general trend remains unchanged. Depending on the value of flow parameters, a singularity may occur in Nusselt number values even in the absence of viscous heating, especially at great values of dimensionless Joule heating term. For a given value of Brinkman number, as dimensionless Debye-Huckel parameter increases, the effect of viscous heating increases. In this condition, as dimensionless Debye-Huckel parameter goes to infinity, the Nusselt number approaches zero, regardless of the magnitude of Joule heating. Furthermore, it is realized that the effect of Brinkman number on Nusselt number for pressure opposed flow is more notable than purely electroosmotic flow, while the opposite is true for pressure assisted flow.
机译：这项研究调查了粘性耗散对完全均匀壁热通量的平行板微通道中充分发展的组合压力和电渗驱动流的热传输特性的影响。对于电势，速度和温度以及Nusselt数的横向分布，可以获得封闭形式的表达式。从结果可以看出，布林克曼数对努塞尔特数具有显着影响。一般来说，增加Brinkman数就是减少Nusselt数。尽管焦耳热的大小会影响Nusselt数的Brinkman数依赖性，但是总体趋势保持不变。根据流量参数的值，即使没有粘性加热，尤其是在无因次焦耳加热项的值很大的情况下，Nusselt值中也会出现奇点。对于给定的Brinkman值，随着无量纲Debye-Huckel参数的增加，粘性加热的影响也会增加。在这种情况下，随着无量纲的Debye-Huckel参数达到无穷大，无论焦耳加热的大小如何，努塞尔数都接近零。此外，已经认识到，对于压力相反的流动，布林克曼数对努塞尔数的影响比纯电渗流更显着，而对于压力辅助的流动则相反。

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