Computational and experimental analysis of droplet transportation/jetting behaviours driven by thin film surface acoustic waves

Hosseini Biroun, Mehdi, Rahmati, Mohammad, Jangi, Mehdi, Tao, Ran, Chen, Baixin and Fu, Richard (2019) Computational and experimental analysis of droplet transportation/jetting behaviours driven by thin film surface acoustic waves. Sensors and Actuators A: Physical, 299. p. 111624. ISSN 0924-4247

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Official URL: https://doi.org/10.1016/j.sna.2019.111624

Abstract

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.

Item Type: Article
Uncontrolled Keywords: Surface Acoustic Wave, Droplet, Micro Actuator, Transportation, Jetting, CLSVOF
Subjects: F300 Physics
G100 Mathematics
H600 Electronic and Electrical Engineering
Department: Faculties > Engineering and Environment > Mathematics, Physics and Electrical Engineering
Faculties > Engineering and Environment > Mechanical and Construction Engineering
Depositing User: Elena Carlaw
Date Deposited: 17 Sep 2019 08:31
Last Modified: 11 Oct 2019 13:19
URI: http://nrl.northumbria.ac.uk/id/eprint/40708

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