An Acoustic Vortex Particle Concentrator

  • Abhijit Sathaye
  • Amit Lal
Conference paper


In this paper, we report on a novel ‘particle capturing’ MEMS device for microfluid sample collection. When the resonance modes of the center-anchored surface micromachined polysilicon disk actuator inside the fluid channel are excited, time averaged acoustic force generates pressure gradients along the disk periphery. These pressure gradients are used to obtain fluid vortices by optimum design of poly-disk Substrate gap and channel height. The vortices trap particles traveling in the Channel due to pressure driven flow. In many ways this vortex capture device is biomimetic — it is like the single-celled organism called Vorticella, which collects food by inducing local vortices [1]. This particle concentrator paradigm gives us the tight control of the particle capture location so that we can integrate optical or acoustic sensors to measure the change in captured particle density over time.

Key Words

Concentrator Acoustic streaming Vortex Microfluidics 


  1. 1.
    Vogel, S., Life in Moving Fluids — The physical biology of flow, Princeton University Press, 1994.Google Scholar
  2. 2.
    Sathaye, A., Kaajakari, V., Lal, A., “Frequency Addressable Ultrasonic Microfluidic Acruator Array,” Transducers’01, Munich, Germany, June 10–14, 2001.Google Scholar

Copyright information

© Springer Science+Business Media New York 2001

Authors and Affiliations

  • Abhijit Sathaye
    • 1
  • Amit Lal
    • 1
  1. 1.SonicMEMS Laboratory Department of Electrical and Computer EngineeringUniversity of Wisconsin — MadisonMadison

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