Magneto-vibratory separation of glass and bronze granular mixtures immersed in a paramagnetic liquid |
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Authors: | López-Alcaraz P Catherall A T Hill R J A Leaper M C Swift Michael R King P J |
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Institution: | (1) School of Physics and Astronomy, University of Nottingham, NG7 2RD Nottingham, UK |
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Abstract: | A fluid-immersed granular mixture may spontaneously separate when subjected to vertical vibration, separation occurring when
the ratio of particle inertia to fluid drag is sufficiently different between the component species of the mixture. Here,
we describe how fluid-driven separation is influenced by magneto-Archimedes buoyancy, the additional buoyancy force experienced
by a body immersed in a paramagnetic fluid when a strong inhomogeneous magnetic field is applied. In our experiments glass
and bronze mixtures immersed in paramagnetic aqueous solutions of MnCl2 have been subjected to sinusoidal vertical vibration. In the absence of a magnetic field the separation is similar to that
observed when the interstitial fluid is water. However, at modest applied magnetic fields, magneto-Archimedes buoyancy may
balance the inertia/fluid-drag separation mechanism, or it may dominate the separation process. We identify the vibratory
and magnetic conditions for four granular configurations, each having distinctive granular convection. Abrupt transitions
between these states occur at well-defined values of the magnetic and vibrational parameters. In order to gain insight into
the dynamics of the separation process we use computer simulations based on solutions of the Navier-Stokes' equations. The
simulations reproduce the experimental results revealing the important role of convection and gap formation in the stability
of the different states. |
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Keywords: | 45 70 Mg Granular flow: mixing segregation and stratification |
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