Shape oscillations of magnetic liquid columns subject to vertical vibration in a uniform magnetic field are examined in the presence of gravity. A magnetic liquid column is formed vertically against gravity in an axial magnetic field produced by Helmholtz coils and then vibrated to produce axisymmetric oscillations. A high-speed video camera is used to observe the column's dynamic shape and two high-resolution laser displacement detectors measure the amplitudes of both the exciter table and the column interface. The experimental interfacial amplitude shows good agreement with our theoretical predictions. Two new wave motions are observed: a progressive wave near the resonance range of the fundamental mode (0,1), and a mode (4,1) azimuthal one-half subharmonic oscillation beyond the mode (0,1) frequency. These are the first observations of such wave motions in a terrestrial experiment and may suggest similar liquid column oscillations in a microgravity environment.
|ホスト出版物のタイトル||Proceedings of the 1999 3rd ASME/JSME Joint Fluids Engineering Conference, FEDSM'99, San Francisco, California, USA, 18-23 July 1999 (CD-ROM)|
|出版社||American Society of Mechanical Engineers|
|出版ステータス||Published - 1999 12 1|
ASJC Scopus subject areas
- Earth and Planetary Sciences(all)
- Environmental Science(all)