title: The behavior of a magnetic filament in flow under the influence of an external magnetic field.
abstract: We present an extensive numerical study of the behaviour of a filament made of ferromagnetic colloidal particles subjected to the simultaneous action of a fluid flow and a stationary external magnetic field perpendicular to the flow lines. We found that in the presence of a shear flow, the tumbling motion observed at zero field is strongly inhibited when the external magnetic field is applied. The field is able to stabilise the filament with a well defined degree of alignment that depends on the balance between hydrodynamic and magnetic torques. In addition, for a Poiseuille flow, it has been found that the initial position has a long lasting influence on the behaviour of the magnetic filament when the external field is applied.
authors.affiliation: IFISC (UIB-CSIC) Instituto de Física Interdisciplinar y Sistemas Complejos, Campus UIB, 07122 Palma de Mallorca, Spain.
authors.forename: Daniel
authors.initials: D
authors.lastname: Lüsebrink
authors.affiliation: IFISC (UIB-CSIC) Instituto de Física Interdisciplinar y Sistemas Complejos, Campus UIB, 07122 Palma de Mallorca, Spain.
authors.forename: Joan J
authors.initials: JJ
authors.lastname: Cerdà
authors.affiliation: Faculty of Physics, Universität Wien, Boltzmanngasse 5, 1090 Wien, Austria.
authors.forename: Pedro A
authors.initials: PA
authors.lastname: Sánchez
authors.affiliation: Faculty of Physics, Universität Wien, Boltzmanngasse 5, 1090 Wien, Austria.
authors.forename: Sofia S
authors.initials: SS
authors.lastname: Kantorovich
authors.affiliation: IFISC (UIB-CSIC) Instituto de Física Interdisciplinar y Sistemas Complejos, Campus UIB, 07122 Palma de Mallorca, Spain.
authors.forename: Tomás
authors.initials: T
authors.lastname: Sintes