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Role of shear-thinning and viscoelasticity on the onset of instability of glass fiber suspensions in the concentric spherical gap between an inner rotating hemisphere and an outer stationary sphere
Authors:Hiroshi Yamaguchi  Xiaodong Niu  Xinrong Zhang  Yuta Ito
Institution:1. Energy Conversion Research Center, Department of Mechanical Engineering, Doshisha University, Kyoto 630-0321, Japan;2. Center for New Energy System and Energy Conservation Technology, Faculty of Engineering, Peking Unversity, Peking 100871, PR China;1. Department of Physics, Science and Research Branch, Islamic Azad University, Tehran, Iran;2. Department of Physics, Islamic Azad University, Central Branch, Tehran, Iran;1. Department of Mechanical Engineering, Johns Hopkins University, Baltimore, MD 21218, USA;2. Department of Applied Science, University of Twente, Enschede, The Netherlands;1. Department of Economics, Babe?-Bolyai University, Cluj-Napoca, Romania;2. Institute of Applied Mathematics, Óbuda University, Budapest, Hungary;1. Department of Mathematics, Inha University, Incheon 22212, Republic of Korea;2. Department of Mathematics, Hankuk University of Foreign Studies, Yongin-si, Gyeonggi-do 17035, Republic of Korea;1. Politecnico di Milano, Dipartimento di Matematica, Via Bonardi, 9, 20133 Milano, Italy;2. Clifford Research Group, Faculty of Applied Sciences, Ghent University, Galglaan 2, 9000 Gent, Belgium
Abstract:An experimental study investigated the effects of glass fiber suspensions on the onset of instability in the non-Newtonian fluid flow in the concentric spherical gaps between an inner rotating hemisphere and an outer stationary whole sphere. Glass fibers with different aspect ratios were mixed with a macromolecule polymeric solution to obtain different suspension fluids. For comparison, the pure macromolecule polymeric fluid was also investigated. The torques on the inner sphere were measured for various spherical gaps and various rotational Reynolds numbers. The onset of instability of the polymeric fluid flows was delayed by adding glass fibers to the polymeric solution for all tested gap ratios.
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