The dynamic behaviour of a micro liquid bridge of magnetic fluid in static and alternating magnetic fields

Abstract

Experimental study on the dynamic behaviour of magnetic fluid micro bridges under the effect of static and alter- nating magnetic fields was conducted using a high-speed video camera system. Two needle-shaped NdFeB permanent magnets were used to generate the static magnetic field, and Helmholtz coil was used to generate alternating field. Harmonic motion of magnetic fluid bridge was observed. It was found that the amplitude in the vibration of magnetic fluid bridge depends on the strength of alternating magnetic field at the constant frequency. Phenomena of filament thinning and breakup in a capillary bridge of magnetic fluid under the alternating magnetic fields were revealed.