磁石-磁性流体系のウォーターエントリーによるキャビティの様相(流体工学,流体機械)

概要

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Some aspects of the transient cavity formed by the impact of the magnet-magnetic fluid systems on the free surface of water were analyzed by a digital high speed camera system. The projectile system was composed of a permanent NdFeB magnet and kerosene-based magnetic fluid HC-50. The spherical and the cylindrical permanent magnets were used in the experiment. The effect of the magnetic fluid adsorption on the cavity formation was clarified. The effect of the alternating magnetic field on the magnet-magnetic fluid projectile was also revealed. The alternating magnetic field was generated by applying alternating current voltage to the Helmholtz coil. The rotary motion of the projectile was generated by the applied alternating field. The applying magnetic field to the magnet-magnetic fluid projectile led to the complicated surface of the cavity.
2010-09-25