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Three-dimensional roughness effect on microchannel heat transfer and pressure drop

机译：三维粗糙度对微通道传热和压降的影响

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摘要

Surface roughness may have a significant impact on microchannel performances, since at such a small scale it is nearly impossible to obtain an actual smooth surface. The numerical approach allows a detailed description of the surface imperfections; thus, we can easily separate roughness from other microscale effects. In this paper, roughness is modelled as a set of three-dimensional conical peaks distributed on the ideal smooth surfaces of a plane microchannel. Different peak heights and different peak arrangements are considered at various Reynolds numbers. Periodicity conditions in both transverse and streamwise directions allow the reduction of the domain to a small volume containing one or two peaks. The performances of parallel plate rough channels are compared with standard correlation. Results show a remarkable effect of roughness on pressure drop, and a weaker one on the Nusselt number. The performances are dependent on the geometrical details of the roughness elements. The impact of the uncertainty in the definition and measurement of the hydraulic diameter is also discussed.
机译：表面粗糙度可能会对微通道性能产生重大影响，因为在如此小的比例下，几乎不可能获得实际的光滑表面。数值方法可以对表面缺陷进行详细描述。因此，我们可以轻松地将粗糙度与其他微尺度效果区分开。在本文中，粗糙度建模为一组分布在平面微通道理想光滑表面上的三维圆锥形峰。在各种雷诺数下考虑不同的峰高和不同的峰排列。沿横向和沿流向的周期性条件允许将畴减小到包含一个或两个峰的小体积。将平行板粗糙通道的性能与标准相关性进行比较。结果表明，粗糙度对压降有显着影响，而对Nusselt数的影响较弱。性能取决于粗糙度元素的几何细节。还讨论了不确定性对液压直径的定义和测量的影响。

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