Investigation of hydrodynamic cavitation induced reactive oxygen species production in microchannels via chemiluminescent luminol oxidation reactions - Archive ouverte HAL Access content directly
Journal Articles Water Research Year : 2022

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

Darjan Podbevšek
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Gilles Ledoux
Matevž Dular

Abstract

Hydrodynamic cavitation was evaluated for its reactive oxygen species production in several convergentdivergent 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.
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Dates and versions

hal-03681503 , version 1 (30-05-2022)

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Darjan Podbevšek, Gilles Ledoux, Matevž Dular. Investigation of hydrodynamic cavitation induced reactive oxygen species production in microchannels via chemiluminescent luminol oxidation reactions. Water Research, 2022, 220, pp.118628. ⟨10.1016/j.watres.2022.118628⟩. ⟨hal-03681503⟩
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