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Second Thermal and Fluids Engineering  Conference

ISSN: 2379-1748
ISBN: 978-1-56700-430-4

Computational Investigation of Microfluidic Oscillator Characteristics for passive mixing.

Tawfiq Chekifi
Laboratory ENERGARID, University Tahri Mohammed Bechar, B. P. 417, route de Kenadsa, 08000 Bechar, Algeria

B. Dennai
Laboratory ENERGARID, University of Bechar B. P. 417, route de Kenadsa, 08000 Bechar, Algeria

R. Khelfaoui
Laboratory ENERGARID, University of Bechar B. P. 417, route de Kenadsa, 08000 Bechar, Algeria

Abstract

The fluidic oscillator is an interesting device developed for passive flow measurement, flow separation and flow control applications. These patented microstructures can produce a high oscillating jet frequency with high flow velocity. Moreover, fluidic oscillators have no moving parts. Commercial CFD code FLUENT was used to perform analysis of flows in microfluidic oscillator, Numerical simulations were carried out for different flow conditions, where water and air were used as working fluids. The oscillation frequencies were identified by the discrete fast Fourier transform method (FFT). Furthermore a low-pressure vortex of fluid flow in the oscillating chamber was observed between the jet stream and the attachment wall. The effect of the operating pressure and the oscillating chamber shape on the microfluidic oscillator performance is investigated. The velocity fluctuations of the feedback flows through the two feedback channels and the output were determined quantitatively. In addition, the behaviour of the low-pressure vortex in both models is analyzed. Comparison of our numerical simulations with available previous work showed reasonably and good agreement, which demonstrate the accuracy of our models.

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