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Design and Simulation of Silicon-Based Ultrasonic Nozzles for Production of Monodispersed Droplets

[+] Author Affiliations
C. H. Cheng, Y. F. Chou

National Taiwan University, Taipei, Taiwan

N. Wang, C. S. Tsai

University of California at Irvine, Irvine, CA

Y. L. Song, C. T. Lee

National Cheng-Kung University, Tainan, Taiwan

S. C. Tsai

California State University, Long Beach, CA

Paper No. BioMed2007-38023, pp. 11-12; 2 pages
doi:10.1115/BioMed2007-38023
From:
  • ASME 2007 2nd Frontiers in Biomedical Devices Conference
  • ASME 2007 2nd Frontiers in Biomedical Devices
  • Irvine, California, USA, June 7–8, 2007
  • Conference Sponsors: Nanotechnology Institute
  • ISBN: 0-7918-4266-5 | eISBN: 0-7918-3797-1
  • Copyright © 2007 by ASME

abstract

This paper reports the design and simulation of Si-based ultrasonic nozzles (or atomizers) that consist of multiple Fourier horns at ultrasonic frequency ranging from 0.57 to 2.75 MHz. Such high frequency ultrasonic nozzles should produce monodispersed droplets (or drops) 2 to 6 μm in diameter, which are ideal to efficiently target medications to different locations within the respiratory system depending on the site of disease. 3-D simulations on vibration mode shape and impedance of the nozzles using a commercial finite element method (FEM) program, ANSYS, yield resonant frequencies of pure longitudinal vibration in good agreement with the measured values. The mode shape simulation also shows that at the resonant frequency the longitudinal vibration amplitude gain at the nozzle tip for 3-horn nozzle is 8, four times that for a single-horn nozzle.

Copyright © 2007 by ASME

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