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Investigation for Toroidal Microfluidic Vortices Generated by a Laser Illumination Application in an Uniform Electric Field

[+] Author Affiliations
Jae-Sung Kwon, Steven T. Wereley

Purdue University, West Lafayette, IN

Paper No. IMECE2011-62743, pp. 1019-1022; 4 pages
doi:10.1115/IMECE2011-62743
From:
  • ASME 2011 International Mechanical Engineering Congress and Exposition
  • Volume 6: Fluids and Thermal Systems; Advances for Process Industries, Parts A and B
  • Denver, Colorado, USA, November 11–17, 2011
  • Conference Sponsors: ASME
  • ISBN: 978-0-7918-5492-1
  • Copyright © 2011 by ASME

abstract

Using micro particle image velocimetry (μPIV) [1], we visualize and analyze strong toroidal microfluidic vortices generated when a near-infrared (1064 nm) laser beam and an alternating current (AC) electric field is simultaneously applied to a chip. The vortices exhibit a source type behavior in the plane normal to the electric field and the flow vorticity is characterized as a function of the electric field potential, electrical AC frequency and laser power. At a constant AC frequency of 9 kHz, the flow vorticity increase as the square of the electric field strength. At constant electric field, the flow vorticity does not change appreciably in 10–100 kHz range and it decreases at larger frequencies (>500 kHz) until when Brownian motion dominates the movement of the 3μm tracer particles. At constant electrical frequency and voltage of 9 kHz and 20Vpp , the flow vorticity remarkably increases as the laser power increases from 20 to 100mW, due to the rapid change of the temperature gradient inside a fluid and its coupling effect with the applied electric field.

Copyright © 2011 by ASME

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