HIGH FREQUENCY SURFACE ACOUSTIC WAVE ATOMIZER

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• 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(???)
• Adviser Cheng-Hsien
  Liu(??? )

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outline

• Introduction
• Fabrication Experimental Setup
• Experimental Results
• Conclusions Discussion

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Introduction -1
SAV-ED (electrostatic deposition)
Surface Acoustic Wave Atomizer
IDT
LDA (Laser Doppler Anemometry)
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Introduction -2history of SAW atomizer

• 1927 Wood and Loomis
• ultrasonic atomization
• Relationship between drop size and exciteation
  frequency
• 1961 Lang
• Ultrasonic vibrator
• Measure the drop size 10800kHz
• 1995 Kurosawa
• SAW atomizer
• 10MHz , drop size 5 60 um

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Introduction -3What is SAW?
1885 British physicist, mathematician Rayleigh
Longitudinal wave Shear
wave Rayleigh wave
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FabricationSAW atomizer
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Experimental Setup -1SAW-ED
5kV
12cm
Test sample Bovine serum albumin (BSA
protein), 0.5 mg/ml, 100ul
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Experimental Setup -2LDA
Laser
5mm
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Experimental Results -1SAW-ED Method
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
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Experimental Results -2LDA Measurement
Size distribution of atomized droplets using LDA
method, 50 MHz, 30 W, continues driving
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Conclusions Discussion 1Compare SAW-ED LDA
SAW-ED
LDA
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Conclusions Discussion 2Compare 50MHz 10MHz

• 10MHz
• range 5 -60
  um
• The droplet range is narrower than 10MHz

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Conclusions Discussion 3thermal 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.

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Reference

• 1 W. R. Wood, A. L. Loomis, The Physical and
  Biological Effects of High Frequency Sound
• Wave of Great Intensity, Philos. Mag.,
  pp.417-437, 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. 69-74, 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
  535-545, 2005
• 5 Atomization Technology, Institute for
  Liquid Atomization and Spray Systems-Japan, ISBN
  4-627-67171-7, 2001 (in Japanese)

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• Thanks for your attention