Application of Magnetic Fluids as a Driving Source of Fluid Motion. 2nd Report. Effects of Waveform of Magnetic Field on Vibrating Characteristics.

Abstract

The characteristics of oscillatory pipe flow driven by the reciprocating motion of a magnetic fluid column are examined mainly under the conditions where the waveform of the oscillating magnetic field is rectangular. The displacement of the fluid column for the rectangular waveform of the magnetic field is larger than that for the sinusoidal waveform. The phase difference between the magnetic field and the displacement of the fluid column increases with the frequency of the applied magnetic field in the lower frequency region. However, it decreases with the frequency in the higher frequency region, in contrast to the sinusoidal waveform. Experimental data on the vibrating characteristics agree qualitatively with the predicted results. The response of the fluid column to sudden change of the magnetic field strength is also examined.