Microfluidic waves.
Microfluidic waves.
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微流体波。
DOI：
10.1039/c0lc00426j
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发表时间：
2011
期刊：
影响因子：
6.1
通讯作者：
Haj-Hariri,Hossein
中科院分区：
文献类型：
--
作者：
Utz,Marcel;Begley,MatthewR;Haj-Hariri,Hossein
从微流控装置流动控制的角度出发，讨论了压力波在带弹性盖的流体通道中的传播。提出了一种描述流体中压力波与弹性盖内弯曲波耦合的理论。在低频时，盖板的横向弯曲比纵向弯曲更大，导致通道中传播的非色散纵向压力波。该理论解决了由于流体的有限粘度和可压缩性而产生的影响。只要波长大于信道宽度，耦合波就可以无色散地传播。结果表明，在典型微流体尺寸的通道中，如果通道被柔性材料（如PDMS）的薄膜覆盖，则波速在几个10 ms−1范围内。讨论了该原理在驻波微流控带通滤波器设计中的应用。在几个千赫的范围内的特征频率很容易实现质量因子高于30。
The propagation of pressure waves in fluidic channels with elastic covers is discussed in view of applications to flow control in microfluidic devices. A theory is presented which describes pressure waves in the fluid that are coupled to bending waves in the elastic cover. At low frequencies, the lateral bending of the cover dominates over longitudinal bending, leading to propagating, non-dispersive longitudinal pressure waves in the channel. The theory addresses effects due to both the finite viscosity and compressibility of the fluid. The coupled waves propagate without dispersion, as long as the wave length is larger than the channel width. It is shown that in channels of typical microfluidic dimensions, wave velocities in the range of a few 10 m s−1 result if the channels are covered by films of a compliant material such as PDMS. The application of this principle to design microfluidic band pass filters based on standing waves is discussed. Characteristic frequencies in the range of a few kHz are readily achieved with quality factors above 30.