Scaling of damping induced by bubbly flow across tubes |
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| Institution: | 1. Département Modélisation de Systèmes et Structures, Commissariat à l''Energie Atomique Saclay, 91191 Gif-sur-Yvette France;2. Département de Mécanique, LadHyX, CNRS-École Polytechnique, 91128 Palaiseau, France;1. State Key Laboratory of Natural Medicines, China Pharmaceutical University, Nanjing 210009, China;2. School of Pharmacy, Queen’s University of Belfast, Belfast BT7 1NN, Northern Ireland, UK;3. Tang Center of Herbal Medicine Research and Department of Anesthesia & Critical Care, University of Chicago, Chicago, IL 60637, USA;1. Department of Psychology, Yale University, New Haven, Connecticut;2. Department of Psychology, University of Michigan Ann Arbor, Ann Arbor, Michigan;3. Donders Institute for Brain, Cognition and Behaviour, Radboud University, Nijmegen, the Netherlands;4. Forensic Psychiatric Centre Pompestichting, Nijmegen, the Netherlands;1. Department of Chemistry, College of Science, Hebei Agricultural University, Baoding 071001, China;2. College of Food Science and Technology, Hebei Agricultural University, Baoding 071001, China;1. University of Applied Sciences of Western Switzerland, HES-SO, HEPIA-Agronomy, 150 route de Presinge 1254, Jussy Geneva, Switzerland;2. University of Lausanne, FGSE-IDYST, Campus Mouline CH-1015, Lausanne, Switzerland |
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| Abstract: | The damping of tubes subjected to two-phase air–water bubbly cross-flow is investigated with the use of an experimental database from several authors. A new definition of damping in stagnant flow is proposed using an extrapolation of the measured values at low dimensionless flow velocities. This approach yields values of damping substantially lower than those currently defined in the literature. They are found to vary continuously with void fraction, within the bubbly flow regime. These data are used to compare several models of the equivalent viscosity of a two-phase mixture. The effect of the flow velocity is then analysed up to fluidelastic instability. It is observed that, using scaling factors based on the characteristics of the liquid phase, fluidelastic effects of bubbly flows are closely related to those known in single-phase flows. |
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