Concentrated vertical jetting mechanism for isotropically focused ZnO/Si surface acoustic waves

Jangi, M., Luo, J.T., Tao, R., Reboud, J. , Wilson, R., Cooper, J.M. , Gibson, D. and Fu, Y.Q. (2019) Concentrated vertical jetting mechanism for isotropically focused ZnO/Si surface acoustic waves. International Journal of Multiphase Flow, 114, pp. 1-8. (doi: 10.1016/j.ijmultiphaseflow.2019.02.002)

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This paper investigates vertical droplet jetting using circular surface acoustic wave (CSAW) devices with annular interdigitated transducers (AIDTs) fabricated on ZnO film coated silicon substrate. The surface vibration on the CSAW devices was simulated using finite element analysis and characterised using laser vibrometry. Results showed that focused wave patterns and compact nodal distributions of vibration were formed at the centre of ZnO/Si CSAW device, which is contrast to an anisotropic wave distribution patterns generated by the same pattern of AIDTs fabricated on 128° Y-cut LiNbO3. Simulation of liquid jetting induced by the isotropically focused CSAW was performed using coupled Volume of Fluid and Level-Set method. Results showed that a sharp and cylindrical liquid column was generated from the ZnO/Si CSAW device induced by acoustic energy coming from all directions within the plane due to the in-plane isotropic nature of the ZnO thin films. The simulation enabled us to capture the different streaming/jetting processes induced by the anisotropic distributions of acoustic pressure generated by the AIDTs on the 128° Y-cut LiNbO3 CSAW device. The concentrated vertical droplet jetting behaviour from the ZnO/Si CSAW devices was investigated experimentally and supported the simulated results.

Item Type:Articles
Additional Information:Funding supports from National Key Research and Development Program of China (Grant no. 2016YFB0402705), and Royal academy of Engineering UK-Research Exchange with China and India. UK Engineering Physics and Science Research Council (EPSRC EP/P018998/1), Newton Mobility Grant (IE161019) through Royal Society and NFSC, NSFC (Grant no. 51302173). Experimental help from Dr. Yifan Li and Dr. Andrew Dennison are gratefully acknowledged.
Glasgow Author(s) Enlighten ID:Cooper, Professor Jonathan and Reboud, Professor Julien and Wilson, Professor Robert
Authors: Jangi, M., Luo, J.T., Tao, R., Reboud, J., Wilson, R., Cooper, J.M., Gibson, D., and Fu, Y.Q.
College/School:College of Science and Engineering > School of Engineering > Biomedical Engineering
College of Science and Engineering > School of Engineering > Electronics and Nanoscale Engineering
Journal Name:International Journal of Multiphase Flow
ISSN (Online):0301-9322
Published Online:12 February 2019
Copyright Holders:Copyright © 2019 Elsevier Ltd.
First Published:First published in International Journal of Multiphase Flow 114: 1-8
Publisher Policy:Reproduced in accordance with the publisher copyright policy

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