標題: Hybrid ferrohydrodynamic instability: Coexisting peak and labyrinthine patterns
作者: Chen, Ching-Yao
Tsai, W. -K.
Miranda, Jose A.
機械工程學系
Department of Mechanical Engineering
公開日期: 1-五月-2008
摘要: We present an experimental study of a different pattern-forming instability occurring when a ferrofluid droplet is immersed in a thin layer of a nonmagnetic fluid, and subjected to a uniform perpendicular magnetic field. The formation of intriguing interfacial structures is observed, and the development of a hybrid-type ferrohydrodynamic instability is verified, where peak and labyrinthine ferrofluid patterns coexist and share a coupled dynamic evolution. Based on our experimental findings we have identified the occurrence of three well defined regimes for the evolution of the miscible Rosensweig peak in which it first grows rapidly, and then gradually decays, to ultimately reimmerse into the surrounding nonmagnetic solvent layer. This unique scenario for the rise and fall of the Rosensweig peak implies the simultaneous emergence of peculiar labyrinthine structures induced by an outward radial flow within the thin nonmagnetic layer. A variety of possible morphologies is revealed (labyrinth, broken tentaclelike fingers, etc.), which result from the interplay between magnetic, diffusive, and convective effects. These free surface flow labyrinthine structures are contrasted to alternative interfacial designs obtained when the experimental system is spatially confined.
URI: http://dx.doi.org/10.1103/PhysRevE.77.056306
http://hdl.handle.net/11536/9361
ISSN: 1539-3755
DOI: 10.1103/PhysRevE.77.056306
期刊: PHYSICAL REVIEW E
Volume: 77
Issue: 5
起始頁: 0
結束頁: 0
顯示於類別:期刊論文


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