Resonant mode-hopping micromixing

Ling-Sheng Jang, Shih Hui Chao, Mark R. Holl, Deirdre R. Meldrum

Research output: Contribution to journalArticle

17 Citations (Scopus)

Abstract

A common micromixer design strategy is to generate interleaved flow topologies to enhance diffusion. However, problems with these designs include complicated structures and dead volumes within the flow fields. We present an active micromixer using a resonating piezoceramic/silicon composite diaphragm to generate acoustic streaming flow topologies. Circulation patterns are observed experimentally and correlate to the resonant mode shapes of the diaphragm. The dead volumes in the flow field are eliminated by rapidly switching from one discrete resonant mode to another (i.e., resonant mode-hop). Mixer performance is characterized by mixing buffer with a fluorescence tracer containing fluorescein. Movies of the mixing process are analyzed by converting fluorescent images to two-dimensional fluorescein concentration distributions. The results demonstrate that mode-hopping operation rapidly homogenized chamber contents, circumventing diffusion-isolated zones.

Original languageEnglish
Pages (from-to)179-186
Number of pages8
JournalSensors and Actuators, A: Physical
Volume138
Issue number1
DOIs
Publication statusPublished - 2007 Jul 20

Fingerprint

Diaphragms
Fluorescein
Flow fields
Topology
Acoustic streaming
diaphragms
flow distribution
Silicon
topology
acoustic streaming
Buffers
Fluorescence
modal response
tracers
Composite materials
buffers
chambers
fluorescence
composite materials
silicon

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Instrumentation
  • Condensed Matter Physics
  • Surfaces, Coatings and Films
  • Metals and Alloys
  • Electrical and Electronic Engineering

Cite this

Jang, Ling-Sheng ; Chao, Shih Hui ; Holl, Mark R. ; Meldrum, Deirdre R. / Resonant mode-hopping micromixing. In: Sensors and Actuators, A: Physical. 2007 ; Vol. 138, No. 1. pp. 179-186.
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Resonant mode-hopping micromixing. / Jang, Ling-Sheng; Chao, Shih Hui; Holl, Mark R.; Meldrum, Deirdre R.

In: Sensors and Actuators, A: Physical, Vol. 138, No. 1, 20.07.2007, p. 179-186.

Research output: Contribution to journalArticle

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