Ferrofluid flow under the influence of rotating magnetic fields

Experimental data are presented concerning the physical mechanism of the electromagnetically induced macroscopic rotation of ferrofluids. The rotating velocity distributions, determined using a DISA anemometer equipment and a tensometric transducer system, showed a very different behaviour of ferrofluids in a low frequency (0 + 10 Hz) rotating magnetic field in comparison with that observed in the higher frequency region ( >15 Hz). The data are compared with other experimental and theoretical results.