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Numerical Simulation of Time-Dependent Electro-osmotic Micro-Mixer for Laboratory-On-a-Chip Applications

Author Affiliations

  • 1Department of Electrical Engineering, Ahar branch, Islamic Azad University, Ahar, IRAN

Res. J. Recent Sci., Volume 4, Issue (2), Pages 83-90, February,2 (2015)

Abstract

Design of Laboratory-On-a-Chip (LOC) devices and components such as micro-pump, micro-mixer, micro-separator, and micro-needle are main challenges in chemical and biological micro-engineering process. Due to low Reynolds number in micro-channel we need to perturb the fluid by time-dependent secondary lateral force. In this paper we design a novel miniaturized micro-channel with embedded electrodes in both micro-chamber and micro-channel. Efficient electro-osmotic flows are generated near the electrodes by exciting the electrodes properly. We studied the interaction between the fluids behavior, electric field and convection-diffusion equation in the proposed model. Velocity field and concentration analysis revealed a high performance mixing efficiency (above 96%) for a 130µm long mixer. The exciting parameters such as frequency and voltage effect are discussed to optimize the proposed micro-mixer.

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