1. Reporter: Ming-Yen Chen(陳名彥)
HIGH FREQUENCY SURFACE ACOUSTIC WAVE ATOMIZER
J. Ju, Y. Yamagata, T. Higuchi, K. Inoue and H. Ohmori
Graduate School of Engineering, The University of Tokyo.
Tranducers07
Reporter: Ming-Yen Chen(陳名彥)
Adviser :Cheng-Hsien Liu(劉承賢 )

2. outline Introduction Fabrication & Experimental Setup
Experimental Results
Conclusions & Discussion

3. Introduction -1 SAV-ED Surface Acoustic Wave Atomizer
(electrostatic deposition)
Surface Acoustic Wave Atomizer
IDT
LDA
(Laser
Doppler
Anemometry)

4. Introduction -2 history of SAW atomizer
1927 Wood and Loomis
ultrasonic atomization
Relationship between drop size and exciteation frequency
1961 Lang
Ultrasonic vibrator
Measure the drop size : 10~800kHz
1995 Kurosawa
SAW atomizer
10MHz , drop size : 5 – 60 um

5. Introduction -3 What is SAW?
1885 British physicist, mathematician Rayleigh
Longitudinal wave +
Shear wave =
Rayleigh wave

6. Fabrication SAW atomizer

7. Experimental Setup -1 SAW-ED
5kV
12cm
Test sample:
Bovine serum albumin
(BSA protein),
0.5 mg/ml, 100ul

8. Experimental Setup -2 LDA
Laser
5mm

9. Experimental Results -1 SAW-ED Method
(п/6) D03xC = (п/6) Dd3xρ
Relationship between atomized
droplet sizes and particle diameter:
Size distribution of deposited particles
and estimated droplet diameter using SAW-ED method, 0.5 mg/ml BSA, 50 MHz, 30 W, continues driving
Droplet diameter range: 4.5 – 21 um

10. Experimental Results -2 LDA Measurement
Size distribution of atomized droplets
using LDA method, 50 MHz, 30 W, continues
driving

11. Conclusions & Discussion 1 Compare SAW-ED & LDA

12. Conclusions & Discussion 2 Compare 50MHz & 10MHz
range: um
The droplet range is narrower than 10MHz

13. Conclusions & Discussion 3 thermal energy & kinetic energy
In high frequency vibration, energy may be transferred into thermal energy due to internal damping.
With thernal energy ,droplet will evaporation, not atomized by vibration.
But, deposition of dry BSA particles indicates that liquid is atomized by kinetic energy.

14. Reference
[1] W. R. Wood, A. L. Loomis, “The Physical and Biological Effects of High Frequency Sound
Wave of Great Intensity”, Philos. Mag., pp , Sep., 1927
[2] R. J. Rang, “Ultrasonic Atomization of Liquids”, J.Acoust. Soc. Am., Vol. 34, No. 1, pp.6-8, Mar., 1961
[3] M. Kurosawa, T. Watanabe, A. Hutami, T. Higuchi, “Surface Acoustic Wave atomizer”,Sensors and Actuators A 50, pp , 1995
[4] J. W. Kim, Y. Yamagata, M. Takasaki, B. H. Lee, H. Ohmori, T. Higuchi, “A device for fabricating protein chips by using a surface acoustic wave atomizer and electrostatic deposition”, Sensors and Actuators B 107, pp , 2005
[5] “Atomization Technology”, Institute for Liquid Atomization and Spray Systems-Japan, ISBN , 2001 (in Japanese)

15. Thanks for your attention