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Vortex flows induced by drop-like aggregate drift in magnetic fluids
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Image of FIG. 1.
FIG. 1.

(a) Drop-like aggregates in the form of needles are elongated in the vertical direction along the applied magnetic field. (b) The same drop-like aggregates after switching off the field: due to the surface tension each needle is divided into several spheres.

Image of FIG. 2.
FIG. 2.

Hele-Shaw cell with the magnetic condensation core placed in the external homogeneous field , generated by Helmholtz coils (not shown in the figure), —video camera built-in in the head of the instrumental microscope.

Image of FIG. 3.
FIG. 3.

The iron sphere in the Hele-Shaw cell surrounded by homogeneous magnetic fluid in zero applied field.

Image of FIG. 4.
FIG. 4.

The initial stage of particle segregation—formation of the “fog.” The applied field (15 kA/m) is directed horizontally.

Image of FIG. 5.
FIG. 5.

Symmetric vortex flows (denoted by the dotted line) induced by magnetophoresis of drop-like aggregates (Multimedia view). [URL: http://dx.doi.org/10.1063/1.4861133.1]doi: 10.1063/1.4861133.1.

Image of FIG. 6.
FIG. 6.

The drop-like aggregates velocity vector field (only 1 vortex of 4 is shown) at two time points: = 0.85 s (on the left); = 14.5 s (on the right) since the external magnetic field is switched on.

Image of FIG. 7.
FIG. 7.

The most intensive phase of the drop-like aggregate motion. In the pole regions it “rains” heavily, whereas at the equator there is no precipitation. = 21 kA/m.



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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Vortex flows induced by drop-like aggregate drift in magnetic fluids