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

被引：107

作者：

Croce, Giulio ^{[1
]}

D'agaro, Paola ^{[1
]}

Nonino, Carlo ^{[1
]}

机构：

[1] Univ Udine, DiEM, I-33100 Udine, Italy

来源：

INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER | 2007年 / 50卷 / 25-26期

关键词：

microchannel; roughness; periodic boundary conditions; laminar flow; pressure drop; heat transfer;

D O I：

10.1016/j.ijheatmasstransfer.2007.06.021

中图分类号：

O414.1 [热力学];

学科分类号：

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. (C) 2007 Elsevier Ltd. All rights reserved.

引用

页码：5249 / 5259

页数：11

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