管内を進行する磁性流体液滴の磁場による変形と分裂(電磁・干渉,一般講演)

概要

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In the present work, the dynamic behavior of a magnetic liquid drop settling in a viscous fluid inside a cylinder in response to impressed magnetic fields is examined. Two coils placed as their axes to be coincide with the cylinder axis and provided the magnetic field for the tests. The Reynolds number Re (Re=aν_z/ν) is in the range of 0.001-0.037. Here, a is the scale of the magnetic liquid drop, ν_z is the settling velocity of the drop and ν (=1.5) is the kinematic viscosity of machine oil. Near the upper coil the center of the drop is forced upwards, but the velocity of the drop is not always decreased. At the middle point between two coils, the drop tends to extend along the field. Due to the change of the shape of the drop, the drag on the drop is reduced and the velocity of the drop is increased.
2008-09-04