Numerical and experimental study of an axially induced swirling pipe flow |
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| Affiliation: | 1. University of Campinas, Dept. of Petroleum Engineering, Brazil;2. University of Campinas, Dept. of Energy, Brazil;1. Institute of Aerospace Thermodynamics (ITLR), University of Stuttgart, Pfaffenwaldring 31, 70569 Stuttgart, Germany;2. Department of Mechanical Engineering, University of Cagliari, Italy;1. Key Laboratory of Distributed Energy Systems of Guangdong Province, Department of Energy and Chemical Engineering, Dongguan University of Technology, Dongguan 523808, China;2. The University of Nottingham in Malaysia, Faculty of Engineering, Jalan Broga, 43500 Semenyih, Selangor Darul Ehsan, Malaysia;1. LMFS, Institute of Mechanics, Chinese Academy of Sciences, Beijing 100190, China;2. Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, China;1. Helmholtz-Zentrum Dresden-Rossendorf, Institute of Fluid Dynamics, Bautzner Landstr. 400, 01328 Dresden, Germany;2. Technische Universität Dresden, AREVA Endowed Chair of Imaging Techniques in Energy and Process Engineering, 01062 Dresden, Germany;3. Department of Mechanical & Industrial Engineering, Faculty of Engineering, Gadjah Mada University, Jalan Grafika No. 2, 55281 Yogyakarta, Indonesia;1. School of Nuclear Science and Engineering, Shanghai Jiao Tong University, Shanghai 200240, China;2. State Key Laboratory of Multiphase Flow in Power Engineering, Xi’an Jiaotong University, Shaanxi 710049, China |
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| Abstract: | In-line flow segregators based on axial induction of swirling flow have important applications in chemical, process and petroleum production industries. In the later, the segregation of gas bubbles and/or water droplets dispersed into viscous oil by swirling pipe flow may be beneficial by either providing a pre-separation mechanism (bubble and/or drop coalescer) or, in the case of water-in-oil dispersions, by causing a water-lubricated flow pattern to establish in the pipe (friction reduction). Works addressing these applications are rare in the literature. In this paper, the features and capabilities of swirling pipe flow axially induced by a vane-type swirl generator were investigated both numerically and experimentally. The numerical analysis has been carried out using a commercial CFD package for axial Reynolds numbers less than 2000. Pressure drop, tangential and axial velocity components as well as swirl intensity along a 5 cm i.d. size and 3 m long pipe were computed. Single phase flow experiments have been performed using a water–glycerin solution of 54 mPa s viscosity and 1210 kg/m3 density as working fluid. The numerical predictions of the pressure drop were compared with the experimental data and agreement could be observed within the range of experimental conditions. The experiments confirmed that swirl flow leads to much higher friction factors compared with theoretical values for non-swirl (i.e. purely axial) flow. Furthermore, the addition of a conical trailing edge reduces vortex breakdown. Visualization of the two-phase swirling flow pattern was achieved by adding different amounts of air to the water–glycerin solution upstream the swirl generator. |
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| Keywords: | Swirl flow Phase segregation Laminar flow Pipe flow Pressure drop |
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