The effect of sparger geometry on gas holdup and regime transition points in a bubble column equipped with perforated plate spargers |
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| Affiliation: | 1. TÜB?TAK Marmara Research Center, Energy Institute, 41470 Gebze, Kocaeli, Turkey;2. Mechanical Engineering Faculty, Istanbul Technical University, 34437 Istanbul, Turkey;1. Aalto University, Department of Biotechnology and Chemical Technology, Kemistintie 1, 02150 Espoo, Finland;2. Department of Applied Science and Technology, Institute of Chemical Engineering, Politecnico di Torino, Torino, Italy;3. Department for Chemical and Process Engineering, BASF SE, Ludwigshafen, Germany;4. Institute of Energy and Power Technology, University of Applied Science Ulm, Ulm, Germany;1. Manufacturing and Process Technologies Research Division, Faculty of Engineering, University of Nottingham, University Park, Nottingham NG7 2RD, United Kingdom;2. Department of Multiphase Reactors, Institute of Chemical Process Fundamentals, Czech Academy of Sciences, Rozvojova 135, Prague 6 165 02, Czech Republic;1. Evonik Industries AG, Paul-Baumann-Straße 1, 45772 Marl, Germany;2. Hamburg University of Technology, Institute of Multiphase Flows, Eißendorfer Straße 38, 21073 Hamburg, Germany;3. Ruhr-University Bochum, Laboratory of Fluid Separation, Universitätsstraße 150, 44801 Bochum, Germany;4. Ruhr-University Bochum, Chair of Theoretical Chemistry, Universitätsstraße 150, D-44780 Bochum, Germany |
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| Abstract: | This paper investigates the effect of sparger geometry on flow regime of a bubble column. The experiments presented in this study were performed under atmospheric pressure with water/air in a cylindrical Plexiglas® column of 33.0 cm i.d. and 3.0 m height. Three different perforated plate spargers were employed. Hole diameter was varied in the range of 1–3 mm, while the free area was 1.0%.The theory of linear stability is used for the prediction of regime transitions in the bubble column and a comparison has been presented between the predictions and the experimental observations. A good agreement between the predictions and the experimental values of transition gas holdup has been obtained.In addition, the data from the literature has been analyzed. Experimental values of transition gas holdups and predictions by the theory of linear stability have been compared with those of literature.A correlation based on dimensionless numbers (Archimedes, Froude, Eötvös and Weber) and the group (do/DC) for the prediction of gas holdup in homogeneous regime is proposed. The average error between the correlation predictions and experimental values remains under ±10%.The proposed correlation is compared with the published data and found to be in fairly good agreement. |
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| Keywords: | Bubble column Flow regime transition Gas holdup Perforated plate sparger Regime transition points Stability analysis |
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