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

Abstract

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.

Keywords

cavitation cloud shedding;free radicals;photon counting;microscale cavitation;luminol chemiluminescence;convergent-divergent channels;

Data

Language: English
Year of publishing:
Typology: 1.01 - Original Scientific Article
Organization: UL FS - Faculty of Mechanical Engineering
UDC: 532.528
COBISS: 109552899 Link will open in a new window
ISSN: 0043-1354
Views: 101
Downloads: 48
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Other data

Secondary language: Slovenian
Secondary keywords: kavitacija;prosti radikali;kemoluminiscenca;
Type (COBISS): Article
Pages: str. 1-11
Issue: ǂVol. ǂ220
Chronology: Jul. 2022
DOI: 10.1016/j.watres.2022.118628
ID: 15468528