Formation of Three-Phase Cavitation Bubbles with Their Own Electric Field in a Hydrophobic Liquid

Abstract

In the paper, we present the results of an experimental study of a hydrophobic liquid flow between non-concentric cylinders. In the region of flow expansion, gas cavitation of the dissolved gas can be observed depending on the gap size between the cylinders. If the liquid contains water, steam cavitation of the impurity can be also observed. Steam cavitation of water occurs when the surfaces of the cylinders with a small gap slide between each other. Water vapor condenses into microdroplets when the flow stops. Three-phase gas bubbles with water microdroplets are formed at the gas-liquid interface. This gas bubble design is shown to have its own electric field. When a bubble rises, its water microdroplet moves along the gas-liquid interface and occupies a minimal distance from the surface of the neighboring bubble. In the case of several three-phase bubbles located nearby, the water microdroplets in them split, indicating the direction of the neighboring electric field sources. A patent for a method of registering sources of quasi-static electric fields was obtained based on the performed research.