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HIGH FREQUENCY SURFACE ACOUSTIC WAVE ATOMIZER

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 ). outline. Introduction

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HIGH FREQUENCY SURFACE ACOUSTIC WAVE ATOMIZER

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  1. 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 (electrostatic deposition) Surface Acoustic Wave Atomizer IDT LDA (Laser Doppler Anemometry)

  4. 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 : 10~800kHz • 1995 Kurosawa SAW atomizer 10MHz , drop size : 5 – 60 um

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

  6. FabricationSAW atomizer

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

  8. Experimental Setup -2LDA Laser 5mm

  9. Relationship between atomized droplet sizes and particle diameter: (п/6) D03xC = (п/6) Dd3xρ 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 diameterrange: 4.5 – 21 um

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

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

  12. Conclusions & Discussion 2Compare 50MHz & 10MHz 10MHz range: 5 -60 um • The dropletrange is narrower than 10MHz

  13. 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.

  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.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)

  15. Thanks for your attention

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