The Influence of Gas–Liquid Interfacial Transport Theory on Numerical Modelling of Plasma Activation of Water



Silsby, JA, Simon, S, Walsh, JL ORCID: 0000-0002-6318-0892 and Hasan, MI ORCID: 0000-0001-6993-933X
(2021) The Influence of Gas–Liquid Interfacial Transport Theory on Numerical Modelling of Plasma Activation of Water. Plasma Chemistry and Plasma Processing, 41 (5). pp. 1363-1380.

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Abstract

<jats:title>Abstract</jats:title><jats:p>Plasma activated water has shown great promise in a number of emerging application domains; yet the interaction between non-equilibrium plasma and liquid represents a complex multiphase process that is difficult to probe experimentally, necessitating the development of accurate numerical models. In this work, a global computational model was developed to follow the concentrations of aqueous reactive species in water treated using a surface barrier discharge in ambient air. While the two-film theory has long superseded other methods of modelling mass transfer in such areas of research as environmental and aerosol science, plasma modelling studies continue to use equilibrium and one-film theories. The transport of reactive species across the gas–liquid interface was therefore treated using the one-film and two-film theories, with the results compared to ascertain which is most appropriate for PAW modelling studies. Comparing the model-predicted concentrations to those measured, it was shown that concentrations of aqueous H<jats:sup>+</jats:sup> and NO<jats:sub>3</jats:sub><jats:sup>−</jats:sup> ions were better represented by the two-film theory, more closely fitting experimental measurements in trend and in magnitude by a factor of ten, while HNO<jats:sub>2</jats:sub> and NO<jats:sub>2</jats:sub><jats:sup>−</jats:sup> showed a slightly worse fit using this theory. This is attributed to the assumption in two-film theory of a gas-phase stagnant film which provides additional resistance to the absorption of hydrophilic species, which is absent in the one-film theory, which could be improved with a more accurate value of the Sherwood number for each species.</jats:p>

Item Type: Article
Uncontrolled Keywords: Atmospheric pressure plasma, Plasma activated water, Numerical modelling, Air plasma chemistry
Divisions: Faculty of Science and Engineering > School of Electrical Engineering, Electronics and Computer Science
Depositing User: Symplectic Admin
Date Deposited: 11 Jun 2021 09:10
Last Modified: 18 Jan 2023 22:35
DOI: 10.1007/s11090-021-10182-7
Open Access URL: https://link.springer.com/article/10.1007/s11090-0...
Related URLs:
URI: https://livrepository.liverpool.ac.uk/id/eprint/3125965