Computational and experimental analysis of droplet transportation/jetting behaviours driven by thin film surface acoustic waves
Computational and experimental analysis of droplet transportation/jetting behaviours driven by thin film surface acoustic waves
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DOI：
10.1016/j.sna.2019.111624
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发表时间：
2019-11-01
影响因子：
4.6
通讯作者：
Fu, Y. Q.
中科院分区：
文献类型：
--
作者：
Biroun, M. H.;Rahmati, M. T.;Fu, Y. Q.
采用耦合水平集流体体积（CLSVOF）方法研究了薄膜声表面波（SAW）器件驱动下固着液滴的剧烈变形/输运/喷射行为。为了验证这种计算方法，液滴传输/喷射的一系列实验研究进行了使用ZnO/Si薄膜为基础的SAW器件的谐振频率范围从64.49 MHz到271.36 MHz。良好的协议之间的计算和实验结果表明，开发的CLSVOF方法在模拟复杂的声流体现象，如显着的内部流动，泵送和喷射的液滴驱动的传播SAW.Results从计算模型得到的结果被用来澄清液滴的振荡和摆动行为在运输过程中的流体机制。数值模拟结果揭示了液滴在输送/喷射过程中不同阶段的流动形态和周围气流速度场。从理论和实验两方面研究了液滴体积、声表面波器件谐振频率和声表面波功率对液滴输运/喷射的影响。特别是，实验和计算结果之间的比较表明，该模型很好地预测了最小的RF功率开始液滴泵送和喷射在各种谐振频率。(C)2019 Elsevier B. V.版权所有。
A Coupled Level Set Volume of Fluid (CLSVOF) approach has been applied to investigate severe deformation/transportation/jetting behaviours of sessile droplet driven by thin-film surface acoustic waves (SAW) devices. For validation of this computational method, a series of experimental studies of droplet transportation/jetting were performed using ZnO/Si thin film based SAW devices with resonant frequencies ranging from 64.49 MHz to 271.36 MHz. Good agreements between the computational and experimental results showed the capability of the developed CLSVOF method in modelling complex acoustofluidics phenomena such as significant internal streaming, pumping and jetting of the droplet driven by the propagating SAW.Results obtained from the computational model are used to clarify the fluidic mechanisms of droplet oscillation and wobbling behaviours during transportation. Numerical results reveal the liquid streaming patterns and airflow velocity field around the droplet at different stages of transportation/jetting process. Effects of droplet volume, the resonant frequency of SAW devices and applied SAW power on droplet transportation/jetting were investigated both theoretically and experimentally. In particular, comparisons between experimental and computational results showed that the model predicted well the minimum RF power to start droplet pumping and jetting at various resonant frequencies. (C) 2019 Elsevier B.V. All rights reserved.