Abstract
AbstractLab-on-a-chip (LOC) and microfluidic devices have gained more and more importance in biological and chemical fields. A homogeneous mix of multiple reagents and chemicals is often essential to assist the chemical and biological reactions. Electroosmotic flow is an attractive approach for enhancing the homogeneous mix of species in a micro-scale mixer. In this work, a two-dimensional microfluidic mixture with a diamond-shaped split-and-recombine structure, using commercial software package COMSOL Multiphysics is analyzed. The choice of suitable electrode length is made by performing a series of simulations. The influence of AC (alternating current) frequency on the mixing of two fluids is also studied. The mixing efficiency of the micromixer initially increases with an increase in AC frequency and after reaching a maximum value, it starts decreasing. The best suited AC potential frequency for different electrode lengths is different. It is found from the results that the increase in electrode length does not always increase the mixing efficiency of the micromixer. The electrode length of such mixers critically affects the mixing efficiency and the suitable electrode length results in improved mixing of fluids. KeywordsMicromixerElectroosmosisMixing efficiencyElectrode length
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