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Start-up rheometry of highly polydisperse magnetorheological fluids: experiments and simulations

Ruiz-López, J. A., Wang, Z. W., Fernández-Toledano, J. C., Hidalgo-Alvarez, R. and de Vicente, J. (2016) Start-up rheometry of highly polydisperse magnetorheological fluids: experiments and simulations. Rheologica Acta, 55 (3). pp. 245-256. ISSN 1435-1528

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To link to this item DOI: 10.1007/s00397-016-0914-y

Abstract/Summary

An extensive experimental and simulation study is carried out in conventional magnetorheological fluids formulated by dispersion of mixtures of carbonyl iron particles having different sizes in Newtonian carriers. Apparent yield stress data are reported for a wide range of polydispersity indexes (PDI) from PDI = 1.63 to PDI = 3.31, which for a log-normal distribution corresponds to the standard deviation ranging from to . These results demonstrate that the effect of polydispersity is negligible in this range in spite of exhibiting very different microstructures. Experimental data in the magnetic saturation regime are in quantitative good agreement with particle-level simulations under the assumption of dipolar magnetostatic forces. The insensitivity of the yield stresses to the polydispersity can be understood from the interplay between the particle cluster size distribution and the packing density of particles inside the clusters.

Item Type:Article
Refereed:Yes
Divisions:Faculty of Science > School of Mathematical, Physical and Computational Sciences > Department of Mathematics and Statistics
ID Code:54004
Publisher:Springer

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