Critical comparison of interfacial boundary conditions in modelling plasma–liquid interaction

Abstract Several computational models have been developed over the past decade with the goal to investigate the various processes that occur during plasma–liquid interaction. However, many different boundary conditions to describe transfer of chemical species over the gas–liquid interface have been reported in these investigations. In this work, we employ a computational model to test these various boundary conditions, and compare the results to experimental data for H 2 O 2 , O 3 , ·NO and HNO 2 , in order to assess how well these boundary conditions can describe the dissolution of different species. We show that the validity of the different formulas depends on the solubility of the investigated chemical species; they appear valid for species with high solubility (H 2 O 2 ), but not for species with low (O 3 and ·NO) or intermediate (HNO 2 ) solubility. Finally, we propose an approach to reach better agreement, based on film theory in combination with the mass accommodation coefficient.