Resumo

DONADO, F.; MENDOZA, C.Y.; VALENCIA, R.  e  SANTIAGO-GARCIA, J.A.. Estudio experimental de la viscosidad de un fluido magneto-reológico a base de magnetita mineral. Rev. mex. fís. E [online]. 2007, vol.53, n.1, pp.31-40. ISSN 1870-3542.

We experimentally study the viscosity of a magnetorheological (MR) fluid based on mineral magnetite and automotive oil for brakes. We use a Brookfield cone-plate rheometer to which it was adapted a solenoid that produces and controls a magnetic field parallel to the cone rotation axis. Even though the particles contain variable amounts of silica impurities and present a wide dispersion in the sizes, the system experiments important changes in the viscosity as a function of the magnetic field, shear rate and particle mean size. We study the behavior of a simplified MR damper and show some of its advantages respect to a conventional damper.

Palavras-chave : magnetorheological fluid; mineral magnetite; magnetorheological damper.

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