Physics – Condensed Matter – Soft Condensed Matter
Scientific paper
2008-10-20
Journal of Rheology / Transactions of the Society of Rheology; Society of Rheology -- Transactions 52, 1 (2008) 287-313
Physics
Condensed Matter
Soft Condensed Matter
Scientific paper
10.1122/1.2798234
We study experimentally the behavior of isotropic suspensions of noncolloidal particles in yield stress fluids. This problem has been poorly studied in the literature, and only on specific materials. In this paper, we manage to develop procedures and materials that allow us to focus on the purely mechanical contribution of the particles to the yield stress fluid behavior, independently of the physicochemical properties of the materials. This allows us to relate the macroscopic properties of these suspensions to the mechanical properties of the yield stress fluid and the particle volume fraction, and to provide results applicable to any noncolloidal particle in any yield stress fluid. We find that the elastic modulus-concentration relationship follows a Krieger-Dougherty law, and we show that the yield stress-concentration relationship is related to the elastic modulus-concentration relationship through a very simple law, in agreement with results from a micromechanical analysis.
Chateau Xavier
Coussot Philippe
Mahaut Fabien
Ovarlez Guillaume
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