A numerical method for determining the shear stress of magnetorheological fluids using the parallel-plate measuring system |
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Authors: | Mikel Zubieta María Jesús Elejabarrieta Mounir Bou-Ali |
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Institution: | (1) Loramendi 4, 20500 Mondragón, Spain |
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Abstract: | This work proposes a new numerical method for determining the shear stress, which does not need any preassumption about the
exact behavior of the fluid to achieve absolute data using a parallel-plate measuring system. The ability for representing
different behaviors along the entire shear-rate range makes this method particularly interesting for the study of magnetorheological
(MR) fluids. In this work, the conversion factors used by the rheometer for concentric-cylinder, cone-plate, and parallel-plate
measuring systems are first analyzed. This analysis shows that the software used by the rheometer is not appropriate for the
quantitative characterization of non-Newtonian fluids using the parallel-plate measuring system. Therefore, a new method for
conversion of the parameters measured by the rheometer to the rheological parameters of the fluid is proposed; simultaneously,
this new method is compared with other correction methods proposed in the literature: the Rabinowitsch-type method and the
single-point method. Finally, the proposed method is applied for the quantitative characterization of an MR fluid. |
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Keywords: | Rheometer Yield stress Rheology Numerical Herschel-Bulkley Modeling |
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