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首页> 外文会议>4th International Conference on Nanochannels, Microchannels and Minichannels 2006(ICNMM2006) pt.B >EXPERIMENTS ON LIQUID PRESSURE-DROP IN RECTANGULAR MICROCHANNELS, SUBJECT TO NON-UNITY ASPECT RATIO AND FINITE ROUGHNESS
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EXPERIMENTS ON LIQUID PRESSURE-DROP IN RECTANGULAR MICROCHANNELS, SUBJECT TO NON-UNITY ASPECT RATIO AND FINITE ROUGHNESS

机译：矩形微通道中液体压降的实验，受非整体纵横比和有限粗糙度的影响

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We concentrate in this contribution onto the pressure-drop in rectangular stainless steel microchannels with a hydraulic diameter of d_h ≈ 133 μm. Three aspect ratios are engaged, namely 1:1, 1:2, 1:5, whereas the hydraulic diameter is maintained constant. The roughness of the channel walls is around r ≈ 1.3 μm, the Reynolds number is up to Re ≈ 4000. We investigate all microchannels in two different lengths to infer highly-accurate correlations for fully-developed flow conditions from pressure difference measurements between the inlet- and outlet plenum. We find with this new technique pressure drop correlations for the fully-developed flow, which agree, both in the laminar and the turbulent regime, reasonably with conventional (macroscopic) correlations. In all cases the laminar/turbulent transition is in the range Re_c ≈ 1800-2300, consistent with findings in macroscopic channels. The influence of roughness is found to be particularly strong for the microchannel of aspect ratio 7:5. This raises the question, whether the dimensionless group (r/d_h) remains the responsible parameter for roughness at extreme aspect ratios.
机译：我们将这一贡献集中在水力直径为d_h≈133μm的矩形不锈钢微通道中的压降上。启用了三个长宽比，即1：1、1：2、1：5，而水力直径则保持恒定。通道壁的粗糙度大约为r≈1.3μm，雷诺数最大为Re≈4000。我们研究了两种不同长度的所有微通道，以根据入口之间的压差测量为充分发展的流动条件推断出高精度的相关性。 -和出气室。我们发现，利用这种新技术，对于完全发展的流动，压降相关性在​​层流和湍流状态下均与常规（宏观）相关性相吻合。在所有情况下，层流/湍流过渡都在Re_c≈1800-2300范围内，与宏观通道中的发现一致。发现对于纵横比为7：5的微通道，粗糙度的影响特别强烈。这就提出了一个问题，即无因次组（r / d_h）是否仍然是极限长宽比下粗糙度的负责参数。

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