Laser induced microbubbles as an alternative driver for liquid pumping

Agrež, Vid (author), Lokar, Žiga (author), Petkovšek, Rok (author)

The laser induced cavitation bubble, which collapses near a rigid boundary with a hole on a microscale is investigated for liquid pumping applications. The generated bubble and the hole have a comparable size on a scale of 100 μm. The dynamics of the process are visually tracked near the hole and through the hole. This is made possible by the translucent 3D-printed boundary. The main measurable quantities are the bubble oscillation times and the bubble movement. For the latter, we show that it follows the power law of the Kelvin impulse for the rigid boundary without a hole for small standoff distances up to the moment when the bubble touches the edge of the hole. Further, it was found that the bubble standoff distance has a negligible influence on the first oscillation time, while it increases by almost a factor of two for the second oscillation. During the second oscillation, the bubble enters the hole and displaces all the liquid in the direction of bubble propagation. This indicates a second pumping driver beside the jet produced during the collapse of the primary bubble.

• Language: English
• Keywords: laser induced cavitation, micro pumping, rigid boundary, bubble 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: 9 str.
• Numbering: Vol. 177, art. 111235
• PID: 20.500.12556/RUL-159211
• UDC: 532.528
• ISSN on article: 0030-3992
• DOI: 10.1016/j.optlastec.2024.111235
• COBISS.SI-ID: 200584195
• Publication date in RUL: 03.07.2024

Record is a part of a journal

• Title: Optics and laser technology
• Shortened title: Opt. laser technol.
• Publisher: Elsevier
• ISSN: 0030-3992
• COBISS.SI-ID: 26072576

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: lasersko povzročena kavitacija, mikročrpanje, trdna meja, dinamika mehurčka