Periodic disintegration and reconnection of magnetic fluid bridge by alternating magnetic field

Issue title: Proceedings from the 17th International Symposium on Applied Electromagnetics and Mechanics (ISEM 2015)

Guest editors: Fumio Kojima, Futoshi Kobayashi and Hiroyuki Nakamoto

Article type: Research Article

Authors: Sudo, Seiichi^{a; *} | Takahashi, Kazuya^a | Nishiyama, Hideya^b

Affiliations: [a] Department of Machine Intelligence and Systems Engineering, Akita Prefectural University, Yurihonjo, Japan | [b] Institute of Fluid Science, Tohoku University, Sendai, Japan

Correspondence: [*] Corresponding author; Seiichi Sudo, Department of Machine Intelligence and Systems Engineering, Akita Prefectural University, Ebinokuchi 84-4, Yurihonjo, Akita 015-0055, Japan. Tel.: +81 184 27 2111; Fax +81 184 27 2188; E-mail:[email protected]

Abstract: This paper is concerned with the magnetic fluid surface instability produced by the external alternating magnetic field with lower strength amplitude. Periodic disintegration and reconnection of magnetic fluid bridge between two small permanent magnets were studied with a high-speed video camera analysis system. Disintegration and connection of the liquid bridge were generated by the external alternating magnetic field produced by the Helmholtz coil. The surface shape of magnetic fluid bridge was changed by the external field every moment. The details of surface phenomena on magnetic fluid bridge were revealed. The relation between the surface shape variation and the external magnetic field was discussed with the Bond numbers.

Keywords: Magnetic fluids, ferrohydrodynamics, surface instability, alternating magnetic field

DOI: 10.3233/JAE-162223

Journal: International Journal of Applied Electromagnetics and Mechanics, vol. 52, no. 1-2, pp. 129-136, 2016