Hydrodynamic cavitation induced reactive oxygen species production in microchannels via chemiluminescent luminol oxidation reactions

date: 02.06.2022

category: Sporočila za javnost

 

Researchers from Laboratory for Water and Turbine Machines (LWTM) published the first systematic study on reactive oxygen species production in cavitating flow. The results were published in a renouned journal Water Research (IF: 11.236). The publication is a result of collaboration with Institut Lumière Matière, Université Claude Bernard Lyon in the scope of project ERC CABUM and ARRS bilateral project Proteus.

It is known that upon the cavitation cloud collapse reactive oxygen species are produced. We focused the research to 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, time resolved and in-situ quantification 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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The article is available: https://doi.org/10.1016/j.watres.2022.118628.

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