Rayleigh-Taylor instability with magnetic fluids: Experiment and theory

G. Pacitto, C. Flament, J.-C. Bacri, M. Widom
2000 Physical review. E, Statistical physics, plasmas, fluids, and related interdisciplinary topics  
We present experiments showing the Rayleigh-Taylor instability at the interface between a dense magnetic liquid and an immiscible less dense liquid. The liquids are confined in a Hele-Shaw cell and a magnetic field is applied perpendicular to the cell. We measure the wavelength and the growth rate at the onset of the instability as a function of the external magnetic field. The wavelength decreases as the field increases. The amplitude of the interface deformation grows exponentially with time
more » ... entially with time in the early stage, and the growth rate is an increasing function of the field. These results are compared to theoretical predictions given in the framework of linear stability analysis.
doi:10.1103/physreve.62.7941 pmid:11138077 fatcat:ssrg5evugzhfrnt56ocpfr3q2e