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Shear flow behavior of confined magnetorheological fluids at low magnetic field strengths

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Abstract

The non-linear properties of iron based magneto-rheological (MR) fluids are investigated at low magnetic field strengths (0–1.7 kA/m) and different gap thickness (0–500 μm) in a plate-plate configuration. Single-width chain models qualitatively predict the low-shear flow behavior when plotting the field-specific viscosity, η F , as a function of the Mason number, Mn: a slope close to −1 is observed in log-log representations. Wall depletion effects are observed when the suspensions are sheared under the presence of low external magnetic fields applied and/or large gap distances. These results are correlated to frictional yield stress measurements and chain length distribution calculations in the presence of the external magnetic field. Finally, an equivalent slip layer thickness is calculated using the method of Yoshimura and Prud’homme.

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Acknowledgements

Financial support by Ministerio de Ciencia y Tecnología (Spain) and FEDER funds (EU) under project MAT2001-3803 is gratefully acknowledged. Dr. D. van den Ende and Prof. J. Mellema from the Institute of Mechanics, Processes and Control, University of Twente, The Netherlands, are thanked for helpful discussions.

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  1. Juan de Vicente

    Present address: Product Microstructure, Unilever R&D Colworth, Colworth House, Sharnbrook, MK44 1LQ, UK

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  1. Departamento de Física Aplicada, Facultad de Ciencias, Universidad de Granada, 18071, Granada, Spain

    Juan de Vicente, Modesto T. López-López, Juan D. G. Durán & Fernando González-Caballero

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  1. Juan de Vicente
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  2. Modesto T. López-López
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  3. Juan D. G. Durán
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Correspondence to Juan de Vicente.

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de Vicente, J., López-López, M.T., Durán, J.D.G. et al. Shear flow behavior of confined magnetorheological fluids at low magnetic field strengths. Rheol Acta 44, 94–103 (2004). https://doi.org/10.1007/s00397-004-0383-6

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