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• W2034129327 abstract "This work is concerned with the investigation of the concentration fields in an electrokinetic micromixer and its optimization in order to achieve high mixing rates. The mixing concept is based on the combination of an alternating electrical excitation applied to a pressure-driven base flow in a meandering microchannel geometry. The electrical excitation induces a secondary electrokinetic velocity component, which results in a complex flow field within the meander bends. A mathematical model describing the physicochemical phenomena present within the micromixer is implemented in an in-house finite-element-method code. We first perform simulations comparable to experiments concerned with the investigation of the flow field in the bends. The comparison of the complex flow topology found in simulation and experiment reveals excellent agreement. Hence, the validated model and numerical schemes are employed for a numerical optimization of the micromixer performance. In detail, we optimize the secondary electrokinetic flow by finding the best electrical excitation parameters, i.e., frequency and amplitude, for a given waveform. Two optimized electrical excitations featuring a discrete and a continuous waveform are discussed with respect to characteristic time scales of our mixing problem. The results demonstrate that the micromixer is able to achieve high mixing degrees very rapidly." @default.
• W2034129327 created "2016-06-24" @default.
• W2034129327 creator A5036808748 @default.
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• W2034129327 date "2012-05-24" @default.
• W2034129327 modified "2023-09-27" @default.
• W2034129327 title "Optimization of an electrokinetic mixer for microfluidic applications" @default.
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• W2034129327 doi "https://doi.org/10.1063/1.4722000" @default.
• W2034129327 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/3371071" @default.
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