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Localization and quantification of radical production in cavitating flows with luminol chemiluminescent reactions

Hydrodynamic cavitation experiments in microfluidic systems have been performed with an aqueous solution of luminol as the working fluid. In order to identify where and how much reactive radical species are formed by the violent bubble collapse, the resulting chemiluminescent oxidation reaction of l...

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Detalles Bibliográficos
Autores principales: Podbevšek, Darjan, Colombet, Damien, Ayela, Frederic, Ledoux, Gilles
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Elsevier 2020
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7786609/
https://www.ncbi.nlm.nih.gov/pubmed/33130383
http://dx.doi.org/10.1016/j.ultsonch.2020.105370
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author Podbevšek, Darjan
Colombet, Damien
Ayela, Frederic
Ledoux, Gilles
author_facet Podbevšek, Darjan
Colombet, Damien
Ayela, Frederic
Ledoux, Gilles
author_sort Podbevšek, Darjan
collection PubMed
description Hydrodynamic cavitation experiments in microfluidic systems have been performed with an aqueous solution of luminol as the working fluid. In order to identify where and how much reactive radical species are formed by the violent bubble collapse, the resulting chemiluminescent oxidation reaction of luminol was scrutinized downstream of a constriction in the microchannel. An original method was developed in order to map the intensity of chemiluminescence emitted from the micro-flow, allowing us to localize the region where radicals are produced. Time averaged void fraction measurements performed by laser induced fluorescence experiments were also used to determine the cavitation cloud position. The combination void fraction and chemiluminescence two-dimensional mapping demonstrated that the maximum chemiluminescent intensity area was found just downstream of the cavitation clouds. Furthermore, the radical yield can be obtained with our single photon counting technique. The maximum radical production rates of 1.2*10(7) OH(•)/s and radical production per processed liquid volume of 2.15*10(10) HO(•)/l were observed. The proposed technique allows for two-dimensional characterisation of radical production in the microfluidic flow and could be a quick, non-intrusive way to optimise hydrodynamic cavitation reactor design and operating parameters, leading to enhancements in wastewater treatments and other process intensifications.
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spelling pubmed-77866092021-01-06 Localization and quantification of radical production in cavitating flows with luminol chemiluminescent reactions Podbevšek, Darjan Colombet, Damien Ayela, Frederic Ledoux, Gilles Ultrason Sonochem Original Research Article Hydrodynamic cavitation experiments in microfluidic systems have been performed with an aqueous solution of luminol as the working fluid. In order to identify where and how much reactive radical species are formed by the violent bubble collapse, the resulting chemiluminescent oxidation reaction of luminol was scrutinized downstream of a constriction in the microchannel. An original method was developed in order to map the intensity of chemiluminescence emitted from the micro-flow, allowing us to localize the region where radicals are produced. Time averaged void fraction measurements performed by laser induced fluorescence experiments were also used to determine the cavitation cloud position. The combination void fraction and chemiluminescence two-dimensional mapping demonstrated that the maximum chemiluminescent intensity area was found just downstream of the cavitation clouds. Furthermore, the radical yield can be obtained with our single photon counting technique. The maximum radical production rates of 1.2*10(7) OH(•)/s and radical production per processed liquid volume of 2.15*10(10) HO(•)/l were observed. The proposed technique allows for two-dimensional characterisation of radical production in the microfluidic flow and could be a quick, non-intrusive way to optimise hydrodynamic cavitation reactor design and operating parameters, leading to enhancements in wastewater treatments and other process intensifications. Elsevier 2020-10-21 /pmc/articles/PMC7786609/ /pubmed/33130383 http://dx.doi.org/10.1016/j.ultsonch.2020.105370 Text en © 2020 The Authors http://creativecommons.org/licenses/by-nc-nd/4.0/ This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/).
spellingShingle Original Research Article
Podbevšek, Darjan
Colombet, Damien
Ayela, Frederic
Ledoux, Gilles
Localization and quantification of radical production in cavitating flows with luminol chemiluminescent reactions
title Localization and quantification of radical production in cavitating flows with luminol chemiluminescent reactions
title_full Localization and quantification of radical production in cavitating flows with luminol chemiluminescent reactions
title_fullStr Localization and quantification of radical production in cavitating flows with luminol chemiluminescent reactions
title_full_unstemmed Localization and quantification of radical production in cavitating flows with luminol chemiluminescent reactions
title_short Localization and quantification of radical production in cavitating flows with luminol chemiluminescent reactions
title_sort localization and quantification of radical production in cavitating flows with luminol chemiluminescent reactions
topic Original Research Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7786609/
https://www.ncbi.nlm.nih.gov/pubmed/33130383
http://dx.doi.org/10.1016/j.ultsonch.2020.105370
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