| Citation: | QIU Huachuan, JIANG Libiao. Numerical simulation of droplet motion on glass surface driven by ultrasonic travelling wave[J]. Journal of Beijing University of Aeronautics and Astronautics, 2017, 43(5): 908-917. doi: 10.13700/j.bh.1001-5965.2016.0395(in Chinese)
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Aimed at the situations of the spreading and moving dynamics behavior of the droplet that plays an important role in industrial production and microfluidic chips, an elastic planar model based on the theory of ultrasonic travelling wave was proposed. The droplet on the elastic glass surface was driven by ultrasonic travelling wave generated by the inverse piezoelectric effect of piezoelectric ceramic. The droplet model was built with multi-physics field software COMSOL. Firstly, through the analysis of the ultrasonic travelling wave, the feasibility of the model was verified. During the period of 0 to 60 ms, the droplet behaves a shrinking-spreading sinusoidal oscillation motion driven by ultrasonic travelling wave. Then, the internal flow structure inside the droplet was also investigated. When the droplet radius spreads to the maximum and begins to shrink, the velocity inside the contact surface between the droplet and the substrate changes first. It shows that the change of the velocity field inside the droplet plays an important role in the motion of the contact line. There is a similar elliptic vortex in the flow field inside the droplet, which illustrates that the droplet motion is not a simple translation induced by shrinking-spreading, but a forward movement with rolling. Finally, we studied the dependency of the moving velocity of the droplet on the parameters (driving voltage, driving frequency and dynamic viscosity) via simulations. The results show that the moving velocity of the droplet is significantly influenced by the dynamic viscosity.
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