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Hydrodynamic interaction between a pair of bubbles ascending in shear-thinning inelastic fluids
Authors:J. Rodrigo Vélez-Cordero  Diego Sámano  Pengtao Yue  James J. Feng  Roberto Zenit
Affiliation:1. Instituto de Investigaciones en Materiales, Universidad Nacional Autónoma de México, Apdo. Postal 70-360, D.F. 04510, Mexico;2. Department of Mathematics, Virginia Polytechnic Institute and State University, Blacksburg, VA 24061, USA;3. Department of Chemical and Biological Engineering, University of British Columbia, Vancouver, BC, V6T 1Z3, Canada;1. Department of Mechanical Engineering, ShahreKord University, ShahreKord, 88186- 34141, Iran;2. Department of Aerospace and Mechanical Engineering, Purdue University, West Lafayette, IN, USA;1. State Key Laboratory of Chemical Engineering, School of Chemical Engineering and Technology, Tianjin University, Tianjin 300072, China;2. Laboratory of Reactions and Process Engineering, Nancy-Université, CNRS, 1, rue Grandville, BP 20451, 54001 Nancy Cedex, France;1. Chair of Chemical and Process Engineering, Technische Universität Berlin, Sekr. FH 6-1, Strasse des 17. Juni 135, 10623 Berlin, Germany;2. Graduate School of Engineering, Hokkaido University, N13W8, Sapporo 060-8628, Japan;1. Department of Chemical Engineering, Indian Institute of Technology Hyderabad, Yeddumailaram 502 205, Andhra Pradesh, India;2. Department of Mechanical Engineering, University of Thessaly, Volos 38334, Greece;3. Department of Chemical Engineering, Imperial College London, South Kensington Campus, London SW7 2AZ, UK
Abstract:The interaction of two bubbles rising in shear-thinning inelastic fluids was studied. The experimental results were complemented by numerical simulations conducted with the arbitrary Lagrangian–Eulerian technique. Different initial alignments of the bubble pair were considered. Similarities and differences with the Newtonian fluids were found. The most noticeable difference is the so-called drafting–kissing–tumbling (DKT) process: for the case of bubbles rising in thinning fluids, the tumbling phase does not occur and the pair tends to form a stable doublet. The DKT process is also influenced by the amount of inertia and deformability of the individual bubbles and the initial angle between them. The experimental and numerical results suggest that the thinning wake formed behind the bubbles plays an important role in the speed of the pair and the formation of clusters in thinning fluids.
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