caa a22 4500 606197818 CHVBK 20210128100931.0 cr unu---uuuuu 210128e20151201xx s 000 0 eng 10.1007/s00348-015-2075-7 doi (NATIONALLICENCE)springer-10.1007/s00348-015-2075-7 Torsional oscillations of a sphere in a Stokes flow [Elektronische Daten] [F. Box, A. Thompson, T. Mullin] The results of an experimental investigation into a sphere performing torsional oscillations in a Stokes flow are presented. A novel experimental set-up was developed, which enabled the motion of the sphere to be remotely controlled through application of an oscillatory magnetic field. The response of the sphere to the applied field was characterised in terms of the viscous, magnetic and gravitational torques acting on the sphere. A mathematical model of the system was developed, and good agreement was found between experimental, numerical and theoretical results. The flow resulting from the motion of the sphere was measured, and the fluid velocity was found to have an inverse square dependence on radial distance from the sphere. The good agreement between measurements and the analytical solutions for both fluid velocity and angular displacement of the sphere indicates that the flow may be considered Stokesian, thus providing an excellent basis for experimental and theoretical characterisation of hydrodynamic interactions between multiple oscillating spheres at low Reynolds number. Springer-Verlag Berlin Heidelberg, 2015 Box F. Manchester Centre for Nonlinear Dynamics, School of Physics and Astronomy, University of Manchester, Oxford Road, M13 9PL, Manchester, UK aut Thompson A. Manchester Centre for Nonlinear Dynamics, School of Mathematics, University of Manchester, Oxford Road, M13 9PL, Manchester, UK aut Mullin T. Manchester Centre for Nonlinear Dynamics, School of Physics and Astronomy, University of Manchester, Oxford Road, M13 9PL, Manchester, UK aut Experiments in Fluids Springer Berlin Heidelberg 56/12(2015-12-01), 1-11 0723-4864 56:12<1 2015 56 348 https://doi.org/10.1007/s00348-015-2075-7 text/html Onlinezugriff via DOI BK010053 XK010053 XK010000 Metadata rights reserved Springer special CC-BY-NC licence nationallicence 1 research-article jats NATIONALLICENCE NATIONALLICENCE NL-springer NATIONALLICENCE 856 40 https://doi.org/10.1007/s00348-015-2075-7 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Box F. Manchester Centre for Nonlinear Dynamics, School of Physics and Astronomy, University of Manchester, Oxford Road, M13 9PL, Manchester, UK aut NATIONALLICENCE 700 1- Thompson A. Manchester Centre for Nonlinear Dynamics, School of Mathematics, University of Manchester, Oxford Road, M13 9PL, Manchester, UK aut NATIONALLICENCE 700 1- Mullin T. Manchester Centre for Nonlinear Dynamics, School of Physics and Astronomy, University of Manchester, Oxford Road, M13 9PL, Manchester, UK aut NATIONALLICENCE 773 0- Experiments in Fluids Springer Berlin Heidelberg 56/12(2015-12-01), 1-11 0723-4864 56:12<1 2015 56 348