Paper presented at the 5th International Conference on Heat Transfer, Fluid Mechanics and Thermodynamics, South Africa, 1-4 July, 2007.
The motion of a magnetic drop through a narrow passage
under an applied magnetic field is investigated experimentally.
The influences of two control parameters: the strength of
applied magnetic field and the width of passage, are
investigated. Many interesting phenomena in the processes of
the motions are observed, such as drop deformation, necking
down, pinch-off, separation, and the formation of a satellite
drop. From the results, different motions of a drop through the
passage are categorized into four modes which strongly depend
on the control parameters. Moreover, effects of the control
parameter on the time of a magnetic drop passing through a
narrow passage are evaluated as well. The weaker strength of
applied magnetic field and a smaller diameter of the passage
result in the difficulty to pass through the passage and longer
time to complete the whole process.