Finite amplitude wave propagation through bubbly fluids

Ohl, Siew-Wan (author), Rosselló, Juan Manuel (author), Fuster, Daniel (author), Ohl, Claus-Dieter (author)

The existence of only a few bubbles could drastically reduce the acoustic wave speed in a liquid. Wood’s equation models the linear sound speed, while the speed of an ideal shock waves is derived as a function of the pressure ratio across the shock. The common finite amplitude waves lie, however, in between these limits. We show that in a bubbly medium, the high frequency components of finite amplitude waves are attenuated and dissipate quickly, but a low frequency part remains. This wave is then transmitted by the collapse of the bubbles and its speed decreases with increasing void fraction. We demonstrate that the linear and the shock wave regimes can be smoothly connected through a Mach number based on the collapse velocity of the bubbles.

• Language: English
• Keywords: bubbly fluid, wave speed, shock wave, direct numerical simulation, gelatin gel, high speed photography
• 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: 9 str.
• Numbering: Vol. 176, art. 104826
• PID: 20.500.12556/RUL-156073
• UDC: 532.528
• ISSN on article: 1879-3533
• DOI: 10.1016/j.ijmultiphaseflow.2024.104826
• COBISS.SI-ID: 194638339
• 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-NC 4.0, Creative Commons Attribution-NonCommercial 4.0 International
• Link: http://creativecommons.org/licenses/by-nc/4.0/
• Description: A creative commons license that bans commercial use, but the users don’t have to license their derivative works on the same terms.

Secondary language

• Language: Slovenian
• Keywords: mehurčkasti fluid, hitrost toka, direktna numerična simulacija, želatina, visokohitrostna fotografija