Self-forming, quasi-two-dimensional, magnetic-fluid patterns with applied in-plane-rotating and dc-axial magnetic fields
Self-forming, quasi-two-dimensional, magnetic-fluid patterns with applied in-plane-rotating and dc-axial magnetic fields
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DOI：
10.1063/1.1851453
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发表时间：
2005-05
影响因子：
3.2
通讯作者：
S. Elborai;Do Kyung Kim;Xiaowei He;Sehee Lee;Scott Rhodes;M. Zahn
中科院分区：
文献类型：
--
作者：
S. Elborai;Do Kyung Kim;Xiaowei He;Sehee Lee;Scott Rhodes;M. Zahn
We report flow instabilities with simultaneous, in-plane-rotating and dc-axial uniform magnetic fields. In uniform dc-axial magnetic fields, a ferrofluid drop in a Hele-Shaw cell with an∼1.0-mm gap forms the familiar labyrinth pattern. With subsequent application of an ∼100-G rms in-plane, 20–40-Hz rotating uniform magnetic field, smooth spirals form. If the rotating magnetic field is applied first, the drop holds together for low dc-axial magnetic fields and no labyrinth pattern develops. If the dc magnetic field is subsequently increased above a threshold value, the ferrofluid drop abruptly transforms into many ferrofluid droplets arranged in a regular pattern.
