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Squeeze flow magnetorheology

de Vicente, Juan and Ruiz-López, José Antonio and Andablo-Reyes, Efrén and Segovia-Gutiérrez, Juan Pablo and Hidalgo-Alvarez, Roque (2011) Squeeze flow magnetorheology. Journal of Rheology, 55 (4). pp. 753-779. ISSN 1520-8516

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This paper is concerned with an investigation of the rheological performance of magnetorheological fluids under squeeze flow. Preliminary results on Newtonian fluids are first compared to Stefan’s equation. Then, unidirectional monotonic compression tests are carried out in the presence of uniaxial external magnetic fields at slow compression rates under constant volume operation. Results are compared to Bingham plastic, biviscous, and single chain micromechanical squeeze flow models. Measurements using combined deformation modes (compression+small-strain oscillatory shear) suggest a compression-induced shear strengthen effect up to strains of ∼0.5. Particle-level dynamic simulations are in qualitatively good agreement with experimental observations.