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首页> 外文会议>The 2001 ASME International Mechanical Engineering Congress and Exposition, 2001, Nov 11-16, 2001, New York, New York >INSTANTANEOUS VELOCITY PROFILES AND CHARACTERISTICS OF PRESSURE-DRIVEN FLOW IN MICROCHANNELS
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INSTANTANEOUS VELOCITY PROFILES AND CHARACTERISTICS OF PRESSURE-DRIVEN FLOW IN MICROCHANNELS

机译：微通道中的瞬时速度分布和压力驱动流动特征

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摘要

This paper presents a review of the flow characteristics in microchannels and our own flow visualization work using a photochromic dye activation technique. The review reveals differences in flow behaviour between micro- and macro-channels, and the need to measure instantaneous velocity profiles to explain these differences. In the experiment, de-ionized water containing a photochromic dye was pumped through a square capillary tube with inner dimensions of 96 μm X 96 μm to yield a Reynolds number of 0.1. A pulsed ultraviolet laser beam was used to create dye traces in the flowing liquid, and images of the traces were recorded with a video camera. Friction factor in laminar flow was also determined from pressure drop measurements at several Reynolds numbers using tap water. The experimental results showed the flow in intermediate-sized microchannels at low Reynolds numbers to still conform to conventional fluid mechanics theory, possibly with slight deviation. The success in obtaining quantitative results with this approach holds promise for further studies of flows in microchannels with smaller diameters.
机译：本文介绍了微通道中的流动特性，以及我们自己使用光致变色染料活化技术进行的流动可视化工作。该评论揭示了微通道和宏通道之间流动特性的差异，并且需要测量瞬时速度曲线来解释这些差异。在实验中，将包含光致变色染料的去离子水泵送通过内部尺寸为96μmX 96μm的方形毛细管，以产生雷诺数0.1。使用脉冲紫外激光束在流动的液体中产生染料痕迹，并使用摄像机记录痕迹的图像。还通过使用自来水在几个雷诺数下的压降测量值确定了层流中的摩擦系数。实验结果表明，在低雷诺数下的中等尺寸微通道中的流动仍符合常规流体力学理论，可能略有偏差。通过这种方法获得定量结果的成功，为进一步研究直径较小的微通道中的流动提供了希望。

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