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首页> 外文期刊>Journal of Micromechanics and Microengineering >Microfluidic flows in metallic microchannels fabricated by the spacer method
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Microfluidic flows in metallic microchannels fabricated by the spacer method

机译：间隔法制备的金属微通道中的微流体流动

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摘要

Straight and bent copper microchannels are fabricated by the spacer method and their microfluidic flow characteristics are investigated. The effect of the surface roughness of the microchannel walls, which can be controlled by selecting the starting copper powder size, is focused on. The rough surface of a thin straight microchannel (with an arithmetic surface roughness of 4.3 μm and a diameter of 180 μm) caused a higher pressure gradient than other straight microchannels. The pressure gradient for the rough and thin microchannel exceeded the theoretical value for laminar flow at a lower Reynolds number than that reported for a cylindrical pipe with larger dimensions. It is concluded that the large surface roughness relative to the microchannel diameter leads to the early transition from laminar to turbulent flow. Experimental results for bent microchannels also indicate that the large surface roughness at a sharp bend causes significant flow separation.
机译：通过间隔法制备了直的和弯曲的铜微通道，并研究了它们的微流体流动特性。可以通过选择起始铜粉尺寸来控制微通道壁表面粗糙度的影响。较细的笔直微通道的粗糙表面（算术表面粗糙度为4.3μm，直径为180μm）引起的压力梯度高于其他笔直微通道。粗糙和细微通道的压力梯度在低于雷诺数的条件下超过了层流的理论值，而雷诺数却比较大尺寸的圆柱形管的压力梯度小。结论是相对于微通道直径的大表面粗糙度导致从层流到湍流的早期转变。弯曲微通道的实验结果还表明，在急剧弯曲时较大的表面粗糙度会导致明显的流动分离。

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