(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.
Hele-Shaw cell with the magnetic condensation core placed in the external homogeneous field H, generated by Helmholtz coils (not shown in the figure), MC—video camera built-in in the head of the instrumental microscope.
The iron sphere in the Hele-Shaw cell surrounded by homogeneous magnetic fluid in zero applied field.
The initial stage of particle segregation—formation of the “fog.” The applied field (15 kA/m) is directed horizontally.
The drop-like aggregates velocity vector field (only 1 vortex of 4 is shown) at two time points: t 1 = 0.85 s (on the left); t 2 = 14.5 s (on the right) since the external magnetic field is switched on.
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. H 0 = 21 kA/m.
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