Origin of regime transition to turbulent flow in bubble column: Orifice- and column-induced transitions |
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| Institution: | 1. Department of Chemical and Biological Engineering, Korea University, 5-1, Anam-dong, Sungbuk-ku, Seoul 136-701, Republic of Korea;2. Clean Fuel Department, Korea Institute of Energy Research, Daejeon 305-343, Republic of Korea;3. Department of Chemical and Biomolecular Engineering, KAIST, 335 Gwahangno, Yuseong-gu, Daejeon 305-701, Republic of Korea;1. Université Grenoble Alpes, LEGI, F-38000 Grenoble, France;2. CNRS, LEGI, F-38000 Grenoble, France;3. Université Grenoble Alpes, LGP2, F-38000 Grenoble, France;4. CNRS, LGP2, F-38000 Grenoble, France;5. IFP Energies Nouvelles, Rond-Point de l′échangeur de Solaize, BP3, 69360 Solaize, France;1. Politecnico di Milano, Department of Energy, Via Lambruschini 4a, 20156 Milano, Italy;2. Politecnico di Milano, Dipartimento di Chimica, Materiali e Ingegneria Chimica “G. Natta”, Piazza Leonardo da Vinci 32, 20133 Milano, Italy;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 |
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| Abstract: | The possible events during bubble formation on an orifice were investigated using a rectangular bubble column (30 cm × 30 cm × 100 cm). The gas flow rate through a single orifice was adjusted from 0.1 dm3/min to 5.0 dm3/min covering a high flow rate regime. At the high gas flow rate, the bubble formation process was complicated by diverse events, such as wake effect, channeling, and orifice-induced turbulent flow. The detachment period could be used to discern the bubble formation steps because it was strongly affected by the above events. The bubble size distribution around the orifice was also analyzed to gain a clearer understanding of the bubble formation process. Above the rate of 3.0 dm3/min through a single orifice, the detachment period converged to a value of 25 ms irrespective of the orifice diameter. The bubble size distribution also showed little difference in this range of gas flow rate. This could be explained by the development of turbulent flow around the orifice. A 0.15 m in-diameter bubble column was tested to investigate the effect of orifice-induced turbulent flow on the regime transition in which the homogeneous flow regime is converted into the heterogeneous flow regime in the column. Obvious distinction between the orifice- and column-induced transitions was observed. |
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