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      Experimental evaluation of 3D printed Venturi-type Fine Bubble Generators with internal obstacles

      In review


            The generation of Fine Bubbles (FB) using Venturi-type nozzles has been researched experimentally and mathematically using CFD simulations. Nevertheless, little has been discussed about the addition of obstacles in the convergent or divergent parts of the nozzle. Therefore, this research evaluates the performance of six fine bubble generation nozzles that were designed using cloud-based 3D modeling software and 3D printing. The designed nozzles were evaluated in terms of macroscopic features measured through oxygen gas absorption experiments and microscopic features such as size distribution and zeta potential measurements. Moreover, two indexes were proposed based on the gas absorption dynamic responses. These indexes were included in three objective functions that can be solved as mono-objective or multi-objective optimization problems. The nozzles with the best performance were evaluated regarding size distribution and zeta-potential. The results showed that installing obstacles in the divergent part of the nozzle attained higher gas absorption, smaller size of ultra fine bubbles (UFB), and more negative zeta potential.


            Author and article information

            ScienceOpen Preprints
            6 July 2023
            [1 ] Department of Chemical Engineering, Kyoto University, Katsura Campus Nishikyo-ku, Kyoto 615-8510, Japan;
            [2 ] Metallic Materials Science and Physical Metallurgy Department, Politehnica University of Bucharest, 060042, Bucharest, Romania;
            Author notes
            Author information

            This work has been published open access under Creative Commons Attribution License CC BY 4.0 , which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. Conditions, terms of use and publishing policy can be found at www.scienceopen.com .

            : 6 July 2023
            Funded by: funder-id http://dx.doi.org/10.13039/501100001691, Japan Society for the Promotion of Science;
            Award ID: 19K15337

            The datasets generated during and/or analysed during the current study are available from the corresponding author on reasonable request.
            General engineering,Industrial chemistry
            Fine Bubbles,Hydrodynamic cavitation,Gas absorption,Fine bubble stability


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