Simulation of a microfluidic directional driving device with sharp-edge structure excited with acoustic wave

Abstract

The microfluidic device with sharp-edge structures excited with acoustic wave has the characteristics of simple structure, easy manufacture, good bio-compatibility and fast response and has a good application prospect. In order to make full use of its driving characteristics, a scheme of microfluidic driving device with sharp-edge structures is designed in this paper, and the effect of structural parameters on its driving performance is analyzed with the finite element software COMSOL5.6. The model of sharp-edge structure in micro channel is established, and the relationship between the vibration mode and the resonant frequency and the inclined angle of sharp-edge structure is simulated. With the increase of the inclined angle of the sharp-edge structure, its resonant frequency with optimal vibration mode increases. The effects of the micro channel width, the inclined angle between the sharp-edge structure and the micro channel, and the distance between the two sharp-edge structures on the driving velocity are analyzed with the optimal vibration mode. The results show that the parameters of the sharp-edge structure and the micro channel can significantly affect the micro flow field and the driving effect of the micro fluid. As the width of the micro channel, the inclined angle between the sharp-edge structure and the micro channel, and the distance between the two sharp-edge structures decrease, the flow field in the micro channel increases. When the micro channel width is 500[Formula: see text][Formula: see text]m, the inclined angle between the sharp-edge structure and the micro channel is 45∘, and the distance between the two pairs of sharp-edge structures is 150[Formula: see text][Formula: see text]m, the microfluidic driving effect is the best, the maximum flow rate is 458.24[Formula: see text][Formula: see text]m/s and the velocity fluctuation transverse along the micro channel is the smallest.