Cavitation and jetting from shock wave refocusing near convex liquid surfaces

Reese, Hendrik (author), Ohl, Claus-Dieter (author), Rosselló, Juan Manuel (author)

We study the physical mechanisms behind the ejection of a liquid jet from a curved free surface, specifically a free-falling water drop. The jet is produced after a spherical shock wave emitted from a micro-explosion created by a focused laser pulse is refocused on the opposite side of its source. The analysis of high-speed videos of the liquid jet formation revealed that it originates from a larger, prolate cavitation bubble created by the strong tension produced after the reflection of the original wave on the air–liquid interface. The shock wave propagation and jet formation are modeled separately with finite volume simulations in OpenFOAM. Initially we study the pressure evolution inside the drop by comparing the numerical simulations with the distribution of bubbles nucleated after the passage of the negative pressure wave. The jet formation dynamics is explained by comparing the experiments with numerical results. The jet velocity is higher if the laser focus is closer to the drop surface.

• Language: English
• Keywords: shock waves, cavitation, computational fluid dynamics
• Work type: Article
• Typology: 1.01 - Original Scientific Article
• Organization: FS - Faculty of Mechanical Engineering
• Publication status: Published
• Publication version: Version of Record
• Year: 2024
• Number of pages: 5 str.
• Numbering: Vol. 175, art. 104822
• PID: 20.500.12556/RUL-156085
• UDC: 532.528
• ISSN on article: 1879-3533
• DOI: 10.1016/j.ijmultiphaseflow.2024.104822
• COBISS.SI-ID: 194651651
• Publication date in RUL: 07.05.2024

Record is a part of a journal

• Title: International journal of multiphase flow
• Shortened title: Int. j. multiph. flow
• Publisher: Elsevier
• ISSN: 1879-3533
• COBISS.SI-ID: 23219973

Licences

• License: CC BY 4.0, Creative Commons Attribution 4.0 International
• Link: http://creativecommons.org/licenses/by/4.0/
• Description: This is the standard Creative Commons license that gives others maximum freedom to do what they want with the work as long as they credit the author.

Secondary language

• Language: Slovenian
• Keywords: udarni valovi, računalniška dinamika tekočin, kavitacija