| Popis: |
The dynamics of dielectric liquid and liquid drops suspended in another fluid medium subjected to electric field has captivated researchers ever since electro-fluid dynamics was introduced in 17th century. While there has been much work in uniform electric field, recent trends have moved towards the study of how non-uniformity of electric field would induce the motion. The purpose of this thesis is to investigate the response of dielectric liquids and droplets under an ionization technique creating non-uniform electric field. The method applied is corona discharge whose electrical parameters are first studied to understand the behavior of the source impulse. We advocate for the method for it is contactless and enlighten the area of applications considering the limitations of other methods. While studying the behavior of droplet to this electrical signal, their physical changes are tracked down to relate its intrinsic property to this extrinsic discharge phenomena. The dynamic behavior is modeled with the insights of spring-damper analogy and this model is found to capture the different states of deformation while droplet move from one place to other. One distinct feature of this works is to explain how the combined effects of electrophoresis and di-electrophoresis induce the motion and an analogy to differentiate them serves as valuable inputs to carry out electrohydrodynamic(EHD) research. We configured our geometry to address the applicability of this technique to drive very viscous liquids in attempts to see the potentials of the technique being used as EHD pumping. Apart from experiments, we have carried numeric simulations to conclude on the coupled interactions of Electro-Fluid dynamics. |
