DocumentCode :
2593868
Title :
Study of piezoelectric transducer for liquid ejection
Author :
Hon, S.F. ; Kwok, K.W.
Author_Institution :
Dept. of Appl. Phys., Hong Kong Polytech. Univ., Hong Kong, China
fYear :
2009
fDate :
20-24 April 2009
Firstpage :
1050
Lastpage :
1054
Abstract :
Self-focused acoustic transducers using using Fresnel zone plates have been fabricated and used to eject droplets of high-viscosity liquid, without nozzle, in the drop-on-demand mode. The Fresnel zone plate consists of a series of annular electrodes of half-wave-band source, and the acoustic waves are focused by constructive wave interference. Droplets of glycerin with a high-viscosity of 1400 cP can be ejected under a field of 200 kV/m and at a repetitive frequency of 120 Hz. The acoustic pressure distribution in the glycerin has been been simulated using an open-source computational fluid dynamic code OpenFOAM and measured using a needle-type hydrophone. Both the simulation and measurement give the location of two focal points which agree with the observations in the droplet ejection experiment.
Keywords :
acoustic transducers; computational fluid dynamics; piezoelectric transducers; Fresnel zone plates; acoustic pressure distribution; acoustic transducers; acoustic waves; annular electrodes; computational fluid dynamic code OpenFOAM; droplet ejection experiment; frequency 120 Hz; glycerin with; half-wave-band source; high-viscosity liquid; liquid ejection; needle-type hydrophone; piezoelectric transducer; Acoustic measurements; Acoustic transducers; Acoustic waves; Computational modeling; Electrodes; Frequency; Fresnel reflection; Interference; Open source software; Piezoelectric transducers;
fLanguage :
English
Publisher :
ieee
Conference_Titel :
Frequency Control Symposium, 2009 Joint with the 22nd European Frequency and Time forum. IEEE International
Conference_Location :
Besancon
ISSN :
1075-6787
Print_ISBN :
978-1-4244-3511-1
Electronic_ISBN :
1075-6787
Type :
conf
DOI :
10.1109/FREQ.2009.5168355
Filename :
5168355
Link To Document :
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