Characterisation of gas-liquid two-phase flow in minichannels with co-flowing fluid injection inside the channel,part I: unified mapping of flow regimes |
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| Institution: | 1. Helmholtz-Zentrum Dresden-Rossendorf, Bautzner Landstraße 400, 01328 Dresden, Germany;2. TU Dresden, Institute of Power Engineering, 01069 Dresden, Germany;1. Università di Bergamo, Dipartimento di Ingegnerie e Scienze Applicate, Viale Marconi 5, 24044 Dalmine, BG, Italy;2. Università di Pisa, DESTEC, Largo Lazzarino 2, 56122 Pisa, Italy;3. Politecnico di Milano, Dipartimento di Energia, Via Lambruschini 4A, 20158 Milano, Italy;4. School of Computing, Engineering and Mathematics, University of Brighton, BN2 4GJ Brighton, UK;1. Université de Toulouse, INSA, LISBP, 135 Av. de Rangueil, F-31077 Toulouse, France;2. INRA UMR792, Ingénierie des Systèmes Biologiques et des Procédés, F-31400 Toulouse, France;3. CNRS UMR 5504, Ingénierie des Systèmes Biologiques et des Procédés, F-31400 Toulouse, France;4. Université de Toulouse, INPT, LGC, 4 Allée Emile Monso, F-BP 84234, 31432 Toulouse, France;5. CNRS UMR 5503, Laboratoire de Génie Chimique, F-31432 Toulouse, France;6. Fédération de Recherche FERMAT, CNRS, Toulouse, F-31400 Toulouse, France;1. School of Mechanical and Aerospace Engineering, Nanyang Technological University, 50 Nanyang Avenue, Singapore 639798, Singapore;2. Engineering Cluster, Singapore Institute of Technology, 10 Dover Drive, Singapore 138682, Singapore;3. Division of Organic Chemistry, Institute of Chemical and Engineering Sciences, A*STAR, 8 Biomedical Grove Neuros Building, #07-01/02/03, Singapore 138665, Singapore |
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| Abstract: | Present research highlights the potential of apparatuses with integrated minichannel packings to intensify gas-liquid-solid contacting. Especially an operation of these devices within the Taylor flow regime gained extraordinary attention due to its excellent heat and mass transfer and the segmented flow characteristics. However, criteria for flow regime transitions are mainly developed from water-similar fluids and are contradictory which hinders uniform flow regime prediction.This work presents a systematic analysis of adiabatic gas-liquid downflow in a square minichannel of 1.0 mm hydraulic diameter. In the mixing zone located within the flow channel, gas was injected into the co-flowing liquid by so-called capillary injectors with variable inner diameter (0.184, 0.317, 0.490 mm). Experiments were conducted using water, water-glycerol, and water-ethanol mixtures to cover a broad range of material properties. The gas and liquid superficial velocities were varied between 9.81·10-4…2.72 m/s and 1.7·10−4…0.80 m/s, respectively. Taylor flow, Taylor-annular flow, annular flow, churn flow, and bubbly flow were observed. Using the Pi-theorem, 8 significant dimensionless groups dictating the flow transition were identified, namely uG, s/uL, s, ReG, ReL, WeG, WeL, Θ*, dIn, CI/dh, and dOu, CI/dh. Based on more than 1500 experimental data, criteria for the regime transitions of Taylor flow are provided. The derived flow regime map shows good agreement for all applied liquids and for the two larger injector geometries. |
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