Gas/shear-thinning liquid flows through pipes: Modeling and experiments |
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| Institution: | 1. University of Sheffield, Dept. of Geography, Winter Street, S10 2TN, UK;2. DiSTeM, Università di Palermo, via Archirafi, 22, 90123 Palermo, Italy;3. Istituto Nazionale di Geofisica e Vulcanologia, Sezione di Palermo, Via Ugo La Malfa, 153, 90146 Palermo, Italy;4. Lancaster Environment Centre, Lancaster University, Lancaster LA1 4YQ, UK;5. Istituto Nazionale di Geofisica e Vulcanologia, Osservatorio Etneo, Piazza Roma, 2, 95125,11 Catania, Italy;1. Tulsa University Drilling Research Project, The University of Tulsa, Tulsa, OK 74104;2. Chevron Energy Technology Company, Houston, TX 77002;1. School of Nuclear Engineering, Purdue University, 516 Northwestern Ave., West Lafayette, IN, 47907, USA;1. Department of Mechanical Engineering, University of British Columbia, 2054–6250 Applied Science Lane, Vancouver, BC, Canada V6T 1Z4, Canada;2. Departments of Mathematics and Mechanical Engineering, University of British Columbia, 1984 Mathematics Road, Vancouver, BC, Canada, V6T 1Z2, Canada;1. Faculty of Engineering, University of Hull, UK;2. Faculty of Engineering, University of Nottingham, Nottingham NG7 2RD, UK;3. Erbil Technology Institute, Erbil Polytechnic University, Kurdistan region, Iraq;4. Département des Sciences de la Terre, Université de Genève, Switzerland;5. Department of Chemical and Geological Sciences, University of Cagliari, Italy |
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| Abstract: | In chemical and oil industry gas/shear-thinning liquid two-phase flows are frequently encountered. In this work, we investigate experimentally the flow characteristics of air/shear-thinning liquid systems in horizontal and slightly inclined smooth pipes. The experiments are performed in a 9-m-long glass pipe using air and three different carboxymethyl cellulose (CMC) solutions as test fluids. Flow pattern maps are built by visual observation using a high-speed camera. The observed flow patterns are stratified, plug, and slug flow. The effects of the pipe inclination and the rheology of the shear-thinning fluid in terms of flow pattern maps are presented. The predicted existence region of the stratified flow regime is compared with the experimental observation showing a good agreement. A mechanistic model valid for air/power-law slug flow is proposed and model predictions are compared to the experimental data showing a good agreement. Slug flow characteristics are investigated by the analysis of the signals of a capacitance probe: slug velocity, slug frequency, and slug lengths are measured. A new correlation for the slug frequency is proposed and the results are promising. |
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| Keywords: | Shear-thinning fluid Flow pattern map Pressure gradient Slug frequency Stratified flow Slug velocity |
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