A numerical study of the motion of a spherical drop rising in shear-thinning fluid systems |
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| Institution: | 1. Faculty of Vehicle and Energy Engineering, Phenikaa University, Hanoi, Vietnam;2. Faculty of Mechanical Engineering and Mechatronics, Phenikaa University, Hanoi, Vietnam;3. Phenikaa Research and Technology Institute (PRATI), A&A Green Phoenix Group, 167 Hoang Ngan, Hanoi, Vietnam;1. Department of Chemical Engineering, CEFT, Faculty of Engineering, University of Porto, 4200-465 Porto, Portugal;2. School of Engineering, University of Liverpool, Liverpool L69 3GH, UK;3. Department of Mechanical Engineering, CEFT, Faculty of Engineering, University of Porto, 4200-465 Porto, Portugal;4. Departamento de Engenharia Electromecânica, C-MAST Unit, Universidade da Beira Interior, 6201-001 Covilhã, Portugal;5. School of Physics and Astronomy, University of Edinburgh, Edinburgh EH9 3JZ, UK |
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| Abstract: | The dynamical processes of a Newtonian spherical drop rising freely through shear-thinning fluids expressed by the generalized Cross-Carreau (Carreau–Yasuda) model were considered experimentally and computationally. The local effects of shear-thinning on the drop motion, which are hard to evaluate from an experimental approach, are clearly revealed by the numerical results. The relation between the drop motion and the change in viscosity is clearly indicated and considered in detail for the cases in which the non-Newtonian fluids are highly and weakly pseudoplastic. In addition, the modified Reynolds and Morton numbers are discussed in order to describe the drop or bubble free motion in shear-thinning fluids using a more convenient and practical form. |
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