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HIGH FREQUENCY SURFACE ACOUSTIC WAVE ATOMIZER PowerPoint Presentation
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HIGH FREQUENCY SURFACE ACOUSTIC WAVE ATOMIZER

HIGH FREQUENCY SURFACE ACOUSTIC WAVE ATOMIZER

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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