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Fig. 2 a
Sketch of an array of four magnets with alternating orientation.
Curved lines
represent
dipolar vortices driven by electromagnetic forces and
arrows
indicate the direction of rotation.
b
Experimental visualization with dye of the steady flow pattern obtained for an array of four
alternating magnets with an applied current of
I
=
10mA
Fig. 3
Experimental flow visualization in different configurations:
a
array of three magnets with
north orientation and applied current of
I
=
3mA;
b
array of sixmagnets with alternating orientation
and applied current of
I
=
100mA
interaction. On the other hand, Fig.
3
b shows the steady flow generated by an electric
current of 100mA and a magnetic field produced by six alternating magnets placed
at the vertices of a regular hexagon. Since the distance between magnets is smaller
and the current much larger than in the case of three magnets, vortex interactions are
stronger. We observe that the interaction of counter-rotating dipolar vortices cause
the merging or coalescence of vortices forming larger and elongated structures. In
fact, vortex interactions originate a complex flow pattern although clear symmetry
features can be observed.
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