Interface motion of capillary-driven flow in rectangular microchannel
Interface motion of capillary-driven flow in rectangular microchannel
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DOI：
10.1016/j.jcis.2004.07.017
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发表时间：
2004-12-01
影响因子：
9.9
通讯作者：
Maeda, R
中科院分区：
文献类型：
--
作者：
Ichikawa, N;Hosokawa, K;Maeda, R
在微通道流动中，气液界面行为对于开发广泛的微流控应用，特别是在被动微流控系统中具有重要意义。本文讨论了微通道中毛细作用驱动的界面运动。我们已经扩展的理论超出了以前的理论毛细管上升问题的圆形管，一个矩形微通道。得到了与圆管相同的无因次时间与界面位置的关系式。我们研究了矩形微通道与几种尺寸（约50至100微米平方米）的玻璃毛细管和85 × 158微米和75 × 45微米的聚二甲基硅氧烷（PDMS）微通道，分别通过光刻技术制造。我们观察了气液界面位置的移动，并将其与无量纲关系进行了比较。我们得到了一个无量纲变量的驱动力，这是有关的玻璃-水，玻璃-乙醇，和PDMS-乙醇的动态接触角的值。使用这个变量，界面运动可以预测任何尺寸的矩形通道。(C)2004年爱思唯尔公司All rights reserved.
In microchannel flow, gas-liquid interface behavior is important for developing a wide range of microafluidic applications, especially ill passive microfluidic systems. This paper presents a discussion of interface motion driven by capillary action in a microchannel. We have extended the theory beyond the previous theory of capillary rise problem for a Circular tube, to a rectangular microchannel. The same formula for the relation between nondimensional time and interface position is obtained as for a circular tube. We examined rectangular microchannels with several sizes (about 50 to 100 mum square) of glass capillaries and 85 x 158 mum and 75 x 45 mum polydimethylsiloxane (PDMS) microchannels fabricated by photolithography technique, respectively. We observed movement of the gas-liquid interface position and compared it to the dimension less relation. We obtained the value of a dimensionless variable of driving force that is related to dynamic contact angles for glass-water, glass-ethanol, and PDMS-ethanol. Using this variable, interface motion can be predicted for any size of rectangular channels. (C) 2004 Elsevier Inc. All rights reserved.