The present paper is focused on the impact of the dissolution mechanism of the different species (formed within a single bubble) on bubble chemistry. This process is analyzed on a range of ultrasound frequencies from 140 to 515 kHz, at an acoustic intensity of 1 W/cm². The obtained findings are compared to the results available in the literature. | Cite this paper Vietnam J. Chem. 2023 61 5 632-645 Research article DOI Insight into the role of dissolution mechanism in the sonochemistry of acoustic cavitation bubble Aissa Dehane Slimane Merouani Laboratory of Environmental Process Engineering Department of Chemical Engineering Faculty of Process Engineering University Constantine 3 Salah Boubnider . Box 72 25000 Constantine Algeria Submitted March 22 2023 Revised June 3 2023 Accepted June 16 2023 Abstract Using a detailed numerical model in the present work the dissolution process of the different species generated by the acoustic cavitation bubble was investigated through the analysis of bubble chemistry over a range of wave frequencies from 140 to 515 kHz. It has been observed that during the first bubble collapse at 140 and 213 kHz significant amounts of OH O H H2 and O2 molecules from 10-20 to 10-18 mol are dissolved into the bulk liquid . However with the rise of ultrasound frequency gt 213 kHz the number and the quantity of the dissolved substances are decreased H 10-19 mol gt O 10-19 mol gt OH 10-19 mol gt O2 10-20- 10-20 mol . Nevertheless at 355 kHz the dissolution of the main substances is in the order H 10-20 mol gt OH 10-21 mol gt H2 10-21 mol . Despite the low dissolution percentages of the different species compared to the total yield during the first bubble collapse lt 3 it has been observed that the corresponding molar amounts depending on the applied frequency are of great importance 10-18 mol . On the other hand independently of the number of acoustic cycles 1 2 or 3 the dissolution tendency of the different species at 140 and 213 kHz is in the order H2 gt H gt O gt O2 gt OH gt O3 gt HO2 gt H2O2. Nevertheless above 213 kHz this ranking starts to be disturbed with the dominance of the main species . H2 H O OH and O2 molecules. According to the obtained findings in the .
