关键词: 空化泡, 通孔平板, 液体射流, 溃灭周期, OpenFOAM

Abstract: The effectiveness of cavitation cleaning process is closely linked to the ratio of the distance between a cavitation bubble and the orifice plate to its maximum radius in this process. However, most of the previous studies on cavitation bubble dynamics in the vicinity of a through-hole flat plate were limited to the factors such as morphology and jet direction, with little attention given to jet strength or evolutionary period. In this work, a two-phase compressible cavitation bubble dynamics model is used to study the multi-period evolution dynamics of cavitation bubbles near a flat plate with a through-hole, based on the open source fluid dynamics code OpenFOAM. Simulation results reveal that the maximum velocity of the liquid jet, formed by cavitation bubble collapsing, decreases as the distance parameter γ increases when it reaches the center of the hole. As the size parameter ε decreases, this liquid jet's maximum velocity at the hole's center increases. And, with a decrease in γ or ε, the minimum radius of a cavitation bubble at its first collapse increases gradually, the intensity of bubble collapsing slows down, and the time period of the first collapse is prolonged.

Key words: cavitation bubble, through-hole plate, liquid jet, collapse period, OpenFOAM