Nano Science and Technology Institute
Nanotech 2008 Vol. 3
Nanotech 2008 Vol. 3
Nanotechnology 2008: Microsystems, Photonics, Sensors, Fluidics, Modeling, and Simulation - Technical Proceedings of the 2008 NSTI Nanotechnology Conference and Trade Show, Volume 3
Chapter 5: Modeling & Simulation of Microsystems

Numerical Modeling of Microdrop Motion on Digital Microfluidic Multiplexer

Authors:A. Ahmadi, H. Najjaran, J. Holzman, M. Hoorfar
Affilation:University of British Columbia, CA
Pages:561 - 564
Keywords:microdroplet, digital microfluidic multiplexer, contact-angle hysteresis, CFD
Abstract:This paper introduces a computationally efficient numerical modeling approach for microdroplet motion on an innovative Digital Microfluidic Multiplexer structure which enables the pilot synthesis and study of nanoparticles. This structure offers an enhanced level of controllability and flexibility in drop actuation compared to the existing digital microfluidic systems that rely on addressable cell structures. Unlike the cell structures, the Digital Microfluidic Multiplexer has the capability of serving a massively parallel microfluidic system while being scaled down to a few microns without increasing the hardware complexity. Beside the electrowetting on dielectric (EWOD) mechanism, the proposed structure can accommodate an alternative actuation mechanism caused by an external magnetic field on a small current passing thru the droplet. The real-time control of microdroplets under the influence of electrical, magnetic and hydrodynamic effects requires a reliable and computationally efficient model. The model developed in this work approximates a time-variant average velocity using a computational-fluid-dynamic (CFD) code that solves the Navier-Stokes equation for velocity and pressure distributions inside the microdroplet using upwind finite volume method. Then, the estimated average velocity is modified using the contact-angle hysteresis effect and the magnetic field induced force in a converging iterative computational procedure.
Numerical Modeling of Microdrop Motion on Digital Microfluidic MultiplexerView PDF of paper
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