Dynamics of Vapor-Gas Bubbles in a Liquid Near Solid Surfaces with Different Properties

21st Winter School on Continuous Media Mechanics

计算机技术

Lyubimova, T.P.^1^2 ; Rybkin, K.A.^2 ; Fattalov, O.O.^2 ; Filippov, L.O.^1

Institute of Continuous Media Mechanics UB RAS, Acad. Koroleva 1, Perm

614013, Russia^1

Perm State University, Bukireva Str 15, Perm

614990, Russia^2

关键词: Cavitation bubble;    Distilled water;    Fluoroplastics;    Hydrophilic surfaces;    Hydrophobic surfaces;    Salt concentration;    Solid surface;    Water-salt solutions;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/581/1/012041/pdf
DOI  :  10.1088/1757-899X/581/1/012041

学科分类：计算机科学（综合）

来源: IOP

【 摘 要 】

In this paper, the dynamics of vapor-gas bubbles arising in a distilled water and watersalt solutions as a result of coalescence of cavitation bubbles formed under the action of ultrasound (US) near solid surfaces with different properties has been experimentally investigated. Experiments have shown a significant effect of salt concentration in water and properties of solid surface on the behavior of bubbles, both under the action of ultrasonic and after its shutdown. In distilled water, mobile bubbles were observed on hydrophilic surface of wood, most of which are detached from the surface and rise after US shutdown. Bubbles on the hydrophobic surface of fluoroplastic, on the contrary, remain motionless both during the exposure to ultrasonic and after its shutdown. In a 20% aqueous solution of NaCl under the action of ultrasound on the hydrophilic surface, the bubbles remain stationary, and at the time of the shutdown of the ultrasound only a small part of them rise. In similar conditions, mobile bubbles are observed on the hydrophobic surface that rise when the ultrasonic is switched off.