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National Chiao Tung University
Eruption of a magnetic drop immersed within a layer of oils and subjected to perpendicular magnetic field.
When a ferrofluid is subjected to a sufficiently strong vertical magnetic field, visually striking peaks are formed on its free surface, known as the Rosensweig instability. The images show an interesting pattern-forming instability occurring when a ferrofluid droplet is immersed in a thin layer of a nonmagnetic fluid . Evolution of the Rosensweig instability in the formation of a newly discovered fluid annulus is first observed to exceed the interface as shown at t=0.06 s. As the instability proceeds, a central peak is formed at the middle of the annulus at t=0.1 s and 0.2 s. The instability develops continuously and results in a dominant peak in a state of equilibrium at t=3 s and 8 s.
This work is funded by the National Science Council of Taiwan (Republic of China).
 Chen, Ching-Yao, Liu, J.-F. and Wang, L.-C., to appear in Magnetohydrodynamics, 2010.
Reporters may freely use this image. Credit: Chen and Liu, National Chiao Tung University, Taiwan (2010).