Viscosity enhancement in dilute magnetorheological fluids through magnetic perturbations
F. Donado*, U. Sandoval** and J.L. Carrillo**
*Instituto de Ciencias Básicas e Ingeniería de la Universidad Autónoma del Estado de Hidalgo-AAMF, Pachuca 42184, Pachuca, México, e-mail: fernando@uaeh.edu.mx
**Instituto de Física de la Universidad Autónoma de Puebla, Apartado Postal J-48, Puebla 72570, Puebla, México.
]]> Recibido el 7 de febrero de 2011;
Abstract
The influence of a sinusoidal magnetic field on the effective viscosity of a magnetorheological dispersion in the low particle concentration regime is studied experimentally. When a sinusoidal magnetic field of low amplitude, conceived as perturbation, is applied transversally to the static field, a significant enhancement occurs in the measured effective viscosity. The magnitude of changes depends on a number of factors such as the amplitude and frequency of the perturbation, the particle concentration, the application time of the fields, and the shear rate. It has also been found that the behavior of the effective viscosity as a function of frequency presents a critical behavior. Therefore, an average Mason number is proposed, whose behavior as a function of frequency is similar to that shown by the effective viscosity.
Keywords: Magnetorheological fluid; effective viscosity; magnetic perturbations.
Resumen
El efecto de un campo magnético senoidal sobre la viscosidad efectiva de una dispersión magneto-reológica en el régimen de baja concentración de partículas es estudiado experimentalmente. Cuando un campo magnético senoidal de baja amplitud, considerado como perturbación, es aplicado transversalmente al campo esttico, ocurre un significativo incremento en la viscosidad efectiva. La magnitud de los cambios depende de factores tales como la amplitud y la frecuencia de la perturbación, la concentración de partículas, el tiempo de aplicación de los campos, y la rapidez de corte. Se ha encontrado que el comportamiento de la viscosidad efectiva como función de la frecuencia presenta un comportamiento crítico. Por lo tanto, un numero de Mason promedio es propuesto, cuyo comportamiento es similar al mostrado por la viscosidad efectiva.
Descriptores: Fluido magneto-reológico; viscosidad efectiva; perturbaciones magnéticas.
]]>PACS: 83.80.Gv; 45.70.Qj; 83.60.Np
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Acknowledgments
The study was supported financially by CONACyT Mexico, Grant No. 80629. U. Sandoval acknowledges the CONACyT fellowship.
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