Piezoelectric actuators for acoustic mixing in microfluidic devices-Numerical prediction and experimental validation of heat and mass transport
Piezoelectric actuators for acoustic mixing in microfluidic devices-Numerical prediction and experimental validation of heat and mass transport
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DOI：
10.1016/j.snb.2014.08.030
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发表时间：
2014-12-15
影响因子：
8.4
通讯作者：
Minas, G.
中科院分区：
文献类型：
--
作者：
Catarino, S. O.;Silva, L. R.;Minas, G.
微流控装置已经被用于处理和分析小浓度的微尺度流体量，依赖于更小的装置，具有更高的便携性和可用性。本文提出了一种缩短微流控装置分析所需混合时间的解决方案，不需要泵或移动部件。为了加快所需的混合速度，提出了声流技术。研究了两种不同的压电材料PZT和β-PVDF在微流控器件集成中的驱动频率。比较了它们在微流控反应室内混合两种流体时的布局、驱动频率和行为。数值模拟和实验测试表明，两种材料都产生了流动涡，混合时间显著缩短：PZT和β-PVDF的混合时间分别达到90%和80%以上。还观察到传感器表面温度的升高，这对于需要加热的应用是有利的。结果表明，模拟结果与实验结果吻合较好，可用于预测改善微流控装置混合的新材料行为。(C)2014爱思唯尔B.V.保留所有权利。
Microfluidic devices have been used for handling and analyzing micro scale fluidic quantities with small concentrations, relying on smaller devices, with increased portability and availability. This paper proposes a solution to reduce the mixing time required in microfluidic devices analyses, without the need of pumps or moving parts. To speed up the required mixing, acoustic streaming is proposed. Two different piezoelectric materials, PZT and beta-PVDF, are explored, concerning their actuation frequencies, for integration in microfluidic devices. Their layout, actuation frequency and behavior were compared for mixing two fluids inside a microfluidic reaction chamber. Numerical simulations and experimental tests showed flow vortices generation and a significant mixing time reduction for both materials: above 90% for PZT and above 80% for beta-PVDF. It was also observed an increase of the temperature on the transducers surface, which is advantageous for applications in which heating is necessary. The results showed agreement between simulations and experimental tests which can be useful for predicting new materials behavior for improving microfluidic devices mixing. (C) 2014 Elsevier B.V. All rights reserved.