3-D simulation and visualization of laminar flow in a microchannel with hair-pin curves
3-D simulation and visualization of laminar flow in a microchannel with hair-pin curves
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DOI：
10.1002/aic.10165
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发表时间：
2004-07-01
期刊：
影响因子：
3.7
通讯作者：
Morooka, S
中科院分区：
文献类型：
--
作者：
Yamaguchi, Y;Takagi, F;Morooka, S
本研究的目的是研究流体行为在微通道与发夹曲线，使用三维（3-D）计算流体动力学模拟，并观察3-D的流动模式，以验证模拟。所使用的微通道使用平头铣刀在PMMA板上制造。通道的宽度和深度分别为210和205 μ m，每个发夹曲线的半径为500 μ m。两种液体;将纯化水和50 μ mol/L荧光素的水溶液通过不同的入口引入微通道中并合并，在直通道中形成并排的平行流。当平均速度为25 mm/s时，液体被离心力向外推，结果，与中心轴交叉的垂直线在通过第一发夹曲线后扭曲。在第二个发夹曲线，离心力施加在相反的方向，和扭曲的线几乎恢复到初始的垂直线。然而，当平均速度为125 mm/s时，在第一发夹曲线处变形的垂直线在第二曲线之后没有恢复到初始垂直线。两种液体之间的界面是永久波动的。模拟结果与实验数据吻合较好。结果表明，与直微通道相比，发夹形微通道中两种液体通过界面的扩散速率增加。(C)2004年美国化学工程师学会。
The purpose of the present study was to investigate fluidic behavior in a microchannel with hair-pin curves, using a three-dimensional (3-D) computational fluid dynamics simulation, and to observe the 3-D flow pattern, to validate the simulation. The microchannel used was fabricated on a PMMA plate using a flat-end mill. The channel width and depth were 210 and 205 mum, respectively, and the radius of each hair-pin curve was 500 mum. Two liquids; purified water and an aqueous solution of 50 mumol/L fluorescein, were introduced into the microchannel through different inlets and were merged, forming a side-by-side parallel flow in the straight channel. When the average velocity was 25 mm/s, the liquid was thrust outward by centrifugal force and, as a result, the vertical line that crossed the central axis was distorted after passing the first hair-pin curve. At the second hair-pin curve, the centrifugal force was exerted in the opposite direction, and the distorted line returned nearly to an initial vertical line. When the average velocity was 125 mm/s, however, the vertical line, which was distorted at the first hair-pin curve, did not recover to the initial vertical line after the second curve. The interface between the two liquids was permanently waved. The simulation was in good agreement with the experimental data. The results suggest that the diffusion rate through the interface of two liquids in microchannels with hair-pin curves can increase, compared to that in straight microchannels. (C) 2004 American Institute of Chemical Engineers.