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

Mehdi Jangi, J.T. Luo, R. Tao, Julien Reboud, Rab Wilson, J.M. Cooper, Desmond Gibson, Y.Q. Fu

Research output: Contribution to journalArticle

Abstract

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.
Original languageEnglish
Pages (from-to)1-8
Number of pages8
JournalInternational Journal of Multiphase Flow
Volume114
Early online date12 Feb 2019
DOIs
Publication statusE-pub ahead of print - 12 Feb 2019

Fingerprint

surface acoustic wave devices
acoustics
transducers
vibration
distribution (property)
liquids
silicon films
simulation
fluids
thin films
lasers

Keywords

  • focused SAWs
  • ZnO film
  • surface acoustic wave
  • jetting
  • isotropic

Cite this

Jangi, Mehdi ; Luo, J.T. ; Tao, R. ; Reboud, Julien ; Wilson, Rab ; Cooper, J.M. ; Gibson, Desmond ; Fu, Y.Q. / Concentrated vertical jetting mechanism for isotropically focused ZnO/Si surface acoustic waves. In: International Journal of Multiphase Flow. 2019 ; Vol. 114. pp. 1-8.
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abstract = "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.",
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Concentrated vertical jetting mechanism for isotropically focused ZnO/Si surface acoustic waves. / Jangi, Mehdi; Luo, J.T.; Tao, R.; Reboud, Julien; Wilson, Rab; Cooper, J.M.; Gibson, Desmond; Fu, Y.Q.

In: International Journal of Multiphase Flow, Vol. 114, 31.05.2019, p. 1-8.

Research output: Contribution to journalArticle

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AU - Gibson, Desmond

AU - Fu, Y.Q.

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