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Solid-liquid transition and rejuvenation similarities in complex flows of thixotropic materials studied by NMR and MRI

Abstract : We study the flow of a typical thixotropic material subjected to very different deformation histories squeeze, shear, and extrusion with either local proton NMR and magnetic resonance imaging or macroscopic measurements after different times of rest. Specifically, we measure the velocity fields and the spin-spin NMR relaxation of the material after different flow histories. The relaxation data exhibits a long relaxing component revealing information about the reversible microstructural evolution of the sample during aging-rejuvenation cycles. We show that for each deformation process, the evolution of the viscosity during the solid-liquid transition is similar by a factor related to the initial state of the material. Moreover, results examining the impact of the rate at which the deformation is imposed suggest that the state of the material during this transition may be described by a single parameter reflecting the average size and deformation of the material's flocs. These results also show that localization of flow occurs as a result of a progressive differential evolution of the material in different regions of the flow, and thus are determined by the boundary conditions of the flow.
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https://hal.archives-ouvertes.fr/hal-00528357
Contributor : Stephane Rodts <>
Submitted on : Thursday, October 21, 2010 - 4:08:43 PM
Last modification on : Wednesday, January 13, 2021 - 9:40:42 AM

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Stéphane Rodts, Jalila Boujlel, Brooks Rabideau, Guillaume Ovarlez, Nicolas Roussel, et al.. Solid-liquid transition and rejuvenation similarities in complex flows of thixotropic materials studied by NMR and MRI. Physical Review E : Statistical, Nonlinear, and Soft Matter Physics, American Physical Society, 2010, 81, pp.021402. ⟨10.1103/PhysRevE.81.021402⟩. ⟨hal-00528357⟩

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