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Flow and heat transfer in microchannels with rough wall surface

机译：壁面粗糙的微通道中的流动和传热

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Experiments were conducted to investigate the single phase convective heat transfer in a compact heat sink consisting of 26 rectangular microchannels of 300 μm width and 800 μm depth. The relative roughness is estimated to be 4-6%. Deion-ized water was used as the working fluid. Tests were performed with the Reynolds number range of 162-1257, the inlet liquid temperatures of 30, 50 and 70℃ and the heating powers of 140-450 W. The planform area is 5.0 x 1.53 cm~2. It is found that the friction factors and local and average Nusselt numbers significantly depart from those of conventional theories, possibly attributable to the surface roughness. The hydraulically developed but thermally developing flow results in decreased Nusselt numbers versus the non-dimensional axial distance. The temperature dependent fluid physical properties also influence the heat transfer characteristics to some extent. Correlations were provided for the friction factors and the Nusselt numbers.
机译：进行实验以研究紧凑散热器中的单相对流传热，该紧凑散热器由26个宽度为300μm，深度为800μm的矩形微通道组成。相对粗糙度估计为4-6％。去离子水用作工作流体。在雷诺数范围为162-1257，入口液体温度分别为30、50和70℃以及加热功率为140-450 W的条件下进行测试。平面面积为5.0 x 1.53 cm〜2。发现摩擦系数以及局部和平均努塞尔数明显不同于传统理论，可能归因于表面粗糙度。与无量纲的轴向距离相比，水力发展但热力发展的流动导致努塞尔数减少。与温度有关的流体物理特性也在一定程度上影响传热特性。提供了摩擦系数和努塞尔数的相关性。

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