The Electrohydrodynamic mixer for producing homogenous emulsion of dielectric liquids

This paper experimentally investigates the production of a homogeneous emulsion of two dielectric and immiscible liquids of transformer and silicone oils in an electric field with a high voltage. The aim of this paper is the examination of the effects of the electric field intensity, geometric height of two dielectric liquids and the location of non-uniform electrodes on instability process of two liquids' interface and the analysis of a homogeneous emulsion production. Experiments are performed within 50 kV, the height ratio of two liquids in a stable condition is within (H = h1/h2 = 1, 1.25, 1.66, 2.5, 5) and the HV electrode is located in two up and down positions. The interface instability illumination is captured by a high speed digital camera at 1000 f/s using a digital analytic system to a point that a homogeneous emulsion is produced, and the required time to obtain the ultimate goal in different cases is achieved as well. The complete mixing time is calculated till a homogeneous emulsion is obtained which is influenced by a voltage increase and height ratio decrease of two stationary liquids. The results show that both the abovementioned cases lead to a decrease in the complete mixing time. In this context, the way the HV electrodes are located vertically is also effective.