DocumentCode :
3424599
Title :
Unsteady in-plane vortex motion in a microchannel liquid flow
Author :
Lee, Lap Man ; Hau, Winky Lap Wing ; Lee, Yi-Kuen ; Wong, Man ; Zohar, Yitshak
Author_Institution :
Dept. of Aerosp. & Mech. Eng., Arizona Univ., Tucson, AZ, USA
fYear :
2005
fDate :
30 Jan.-3 Feb. 2005
Firstpage :
734
Lastpage :
737
Abstract :
An unsteady flow can dramatically enhance the mixing efficiency in a highly localized region, as the flow would become chaotic if time is an independent variable. In this work, the response of uniform electroosmotic flow to an oscillating electric field is first examined experimentally and numerically as a function of the driving frequency. Then a steady in-plane micro vortex flow pattern, traced by microparticles, is realized and compared to numerical simulations. Upon confirmation of the simulations for uniform but unsteady and steady but non-uniform flows, the CFD code has finally been applied to study unsteady non-uniform flow field, for which it is difficult to measure flow properties. The time evolution of liquid vortex motion in a microchannel, due to either sinusoidal or sudden electric field reversal, is numerically investigated revealing the relationship between length and time scales dominating momentum transfer in electrokinetically-driven unsteady liquid flow.
Keywords :
computational fluid dynamics; electrohydrodynamics; fluid oscillations; microfluidics; vortices; computational fluid dynamics; driving frequency; electrokinetically-driven unsteady liquid flow; in-plane vortex motion; liquid vortex motion; microchannel liquid flow; microparticles; mixing efficiency; momentum transfer; nonuniform flows; oscillating electric field; sudden electric field reversal; uniform electroosmotic flow; unsteady flow; Aerospace electronics; Aerospace engineering; Chaos; Computational fluid dynamics; Electrokinetics; Evolution (biology); Fluid flow; Frequency; Mechanical engineering; Microchannel;
fLanguage :
English
Publisher :
ieee
Conference_Titel :
Micro Electro Mechanical Systems, 2005. MEMS 2005. 18th IEEE International Conference on
ISSN :
1084-6999
Print_ISBN :
0-7803-8732-5
Type :
conf
DOI :
10.1109/MEMSYS.2005.1454034
Filename :
1454034
Link To Document :
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