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- Type of Document: M.Sc. Thesis
- Language: Farsi
- Document No: 52681 (45)
- University: Sharif University of Technology
- Department: Aerospace Engineering
- Advisor(s): Javadi, Khodayar
- Abstract:
- Micropumps are one of the most important devices in the field of microfluidics which have many applications in various fields of engineering. Electrostatic excitation is one of the types of excitation mechanisms in micropumps that is widely used in microelectromechanical systems due to its low power consumption and easier control. In this research, first, the physics of droplets on the surface studied, important dimensionless numbers and other factors influencing microfluidic phenomena are investigated. The effective parameters of the droplet motion and the mechanism of this motion are described. Besides, the phenomenon of electrowetting, one of the phenomena in the field of dynamics of electrical fluids, and during the last two decades the development of its applications in various sectors of technology has been remarkable, simulated by comsol software. In this numerical study, the effect of changing geometrical parameters and important dimensionless numbers on the parameters affecting the droplet transfer between two parallel plates by modeling the electrowetting phenomenon is investigated. The results showed that by increasing the ratio of the microchannel to droplet diameter and increasing Reynolds number, the driving force for fluid pumping was reduced. Also, in this case, the changes of pressure on both sides of the drop’s curved surface decrease. In the next steps, it simulates the phenomenon of electrowetting on dielectric for a static drop-in static equilibrium and how the deformation of the droplet is studied by this effect. Finally, a multi-stage micropump is designed and modeled that can pump fluid droplets continuously
- Keywords:
- Micropumps ; Electro Static Force ; Surface Tension ; Electrostatic Actuation ; COMSOL Software ; Electrowetting
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