A study on the MHD (magnetohydrodynamic) micropump with side-walled electrodes |
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Authors: | Sangsoo Lim Bumkyoo Choi |
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Affiliation: | (1) Department of Mechanical Engineering, Sogang University, Seoul, 121-742, Korea |
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Abstract: | This paper presents the continuous flow MHD(magnetohydrodynamic) micropump with side walled electrodes using Lorentz force,
which is perpendicular to both magnetic and electric fields, for the application of microfluidic systems. A theoretically
simplified MHD flow model includes the theory of fluid dynamics and electromagnetics and it is based upon the steady state,
incompressible and fully developed laminar flow theory. A numerical analysis with the finite difference method is employed
for solving the velocity profile of the working fluid across the microchannel under various operation currents and magnetic
flux densities. In addition, the commercial CFD code called CFD-ACE has been utilized for simulating the MHD micropump. When
the program was run(CFD-ACE), the applied current and magnetic flux density were set to be the variables that affected the
performance of the MHD micropump. The MHD micropump was fabricated by using MEMS technology. The performance of the MHD micropump
was obtained by measuring the flow rate as the applied DC current was changed from 0 to 1mA at 4900 and 3300 Gauss for the
electrodes with the lengths of 5000, 7500 and 10000 μm, respectively. The experimental results were compared with the analytical
and the numerical results. In addition, with the theoretical analysis and the preliminary experiments, we propose a final
model for a simple and new MHD micropump, which could be applicable to microfluidic systems.
This paper was recommended for publication in revised form by Associate Editor Seungbae Lee
Bumkyoo Choi received a B.S. degree in mechanical engineering, M.S. in mechanical design engineering from Seoul National University, Seoul,
Korea in 1981 and 1983 respectively, and PhD in engineering mechanics from the University of Wisconsin, Madison in 1992. From
1992 to 1994, he was a technical staff member of CXrL (Center of X-ray Lithography) in the University of Wisconsin where he
developed a computer code for thermal modeling of X-ray mask membrane during synchrotron radiation. He is currently a professor
in the Dept. of Mechanical Engineering of Sogang Univ., Seoul, Korea. His research interest includes microelec-tromechanical
system (MEMS), micromatching and microfabrication technologies, and modeling issues.
Sangsoo Lim received a B.S. degree in mechanical engineering from Sogang University, Seoul, Korea in 2005. He currently works at Hyundai
Motors. |
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Keywords: | Micropump Microfluidic MHD(magnetohydrodynamic) MEMS μ -TAS CFD |
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