Investigation of hydrodynamic cavitation induced reactive oxygen species production in microchannels via chemiluminescent luminol oxidation reactions

Podbevšek, Darjan (author), Ledoux, Gilles (author), Dular, Matevž (author)

Hydrodynamic cavitation was evaluated for its reactive oxygen species production in several convergent-divergent microchannel at the transition from micro to milli scale. Channel widths and heights were systematically varied to study the influence of geometrical parameters at the transitory scale. A photomultiplier tube was used for time-resolved photon detection and monitoring of the chemiluminescent luminol oxidation reactions, allowing for a contactless and in situ quantization of reactive oxygen species production in the channels. The radical production rates at various flow parameters were evaluated, showing an optimal yield per flow rate exists in the observed geometrical range. While cavitation cloud shedding was the prevailing regime in this type of channels, the photon arrival time analysis allowed for an investigation of the cavitation structure dynamics and their contribution to the chemical yield, revealing that radical production is not linked to the synchronous cavitation cloud collapse events. Instead, individual bubble collapses occurring throughout the cloud formation were recognized to be the source of the reactive oxygen species.

• Language: English
• Keywords: cavitation cloud shedding, free radicals, photon counting, microscale cavitation, luminol chemiluminescence, convergent-divergent channels
• Work type: Article
• Typology: 1.01 - Original Scientific Article
• Organization: FS - Faculty of Mechanical Engineering
• Publication status: Published
• Publication version: Version of Record
• Year: 2022
• Number of pages: 11 str.
• Numbering: Vol. 220, art. 118628
• PID: 20.500.12556/RUL-137030
• UDC: 532.528
• ISSN on article: 0043-1354
• DOI: 10.1016/j.watres.2022.118628
• COBISS.SI-ID: 109552899
• Publication date in RUL: 30.05.2022

Record is a part of a journal

• Title: Water research
• Shortened title: Water res.
• Publisher: Elsevier
• ISSN: 0043-1354
• COBISS.SI-ID: 26617344

Licences

• License: CC BY-NC-ND 4.0, Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International
• Link: http://creativecommons.org/licenses/by-nc-nd/4.0/
• Description: The most restrictive Creative Commons license. This only allows people to download and share the work for no commercial gain and for no other purposes.

Secondary language

• Language: Slovenian
• Keywords: kavitacija, prosti radikali, kemoluminiscenca