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Numerical and experimental investigations of interdigital transducer configurations for efficient droplet streaming and jetting induced by surface acoustic waves
International Journal of Multiphase Flow ( IF 3.8 ) Pub Date : 2021-03-01 , DOI: 10.1016/j.ijmultiphaseflow.2020.103545
Mehdi H. Biroun , Mohammad Rahmati , Mehdi Jangi , Baixin Chen , Yong Qing Fu

Abstract Surface acoustic wave (SAW) based technologies have recently been explored for various sensing and microfluidic applications, and numerous experimental studies and numerical modelling of SAW streaming and liquid-solid interactions have been performed. However, the large deformation of droplet interface actuated by SAWs has not been widely explored, mainly due to the complex physics of SAW-droplet interactions and interfacial phenomena. In this paper, a computational interface tracking method is developed based on the couple level set the volume of fluid (CLSVOF) approach to simulate the interactions between liquid and acoustic waves and deformation of the liquid-air surface. A dynamic contact angle boundary condition is developed and validated by experimental results to simulate the three-phase contact line dynamics. The modified CLSVOF method is then used to study the droplet jetting and internal streaming behaviours by analyzing the energy terms within the liquid medium. Furthermore, by applying the numerical model, effects of configurations and positions of two interdigital transducers (IDTs) on droplet actuation have been investigated to achieve efficient mixing, separation, and jetting. Results show that two perfectly aligned IDTs are optimal for mixing applications. In contrast, two offset IDTs are optimal for concentration and separation applications. The maximum jetting velocity and minimum jetting time are achieved by using a pair of aligned IDTs, whereas by using the two offset IDTs, effective liquid mixing and jetting are observed which can be used in bioprinting applications.

中文翻译:

用于表面声波诱导的高效液滴流和喷射的叉指式换能器配置的数值和实验研究

摘要 基于表面声波 (SAW) 的技术最近被探索用于各种传感和微流体应用,并且已经进行了大量的 SAW 流和液固相互作用的实验研究和数值建模。然而,由 SAW 驱动的液滴界面的大变形尚未得到广泛探索,这主要是由于 SAW-液滴相互作用和界面现象的复杂物理学。在本文中,基于耦合水平集流体体积(CLSVOF)方法开发了一种计算界面跟踪方法,以模拟液体和声波之间的相互作用以及液-气表面的变形。通过实验结果开发和验证动态接触角边界条件以模拟三相接触线动力学。然后使用改进的 CLSVOF 方法通过分析液体介质内的能量项来研究液滴喷射和内部流动行为。此外,通过应用数值模型,研究了两个叉指式换能器 (IDT) 的配置和位置对液滴驱动的影响,以实现有效的混合、分离和喷射。结果表明,两个完美对齐的 IDT 是混合应用的最佳选择。相比之下,两个偏移 IDT 是浓缩和分离应用的最佳选择。最大喷射速度和最小喷射时间是通过使用一对对齐的 IDT 实现的,而通过使用两个偏移 IDT,可以观察到有效的液体混合和喷射,可用于生物打印应用。
更新日期:2021-03-01
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