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Warren-Spring based model for the shear yield locus of cohesive biomass powders

Abstract : The objectives of this work are to determine accurately the cohesion of biomass powders from simple measures and to propose a new method for the description of the yield locus of powders with easy to measure parameters. The cohesion of 32 powders (wood, other biomasses and inorganic powders) have been analysed with two methods. The first method is the determination of the yield locus from shear tests at 3 kPa, performed with a powder rheometer, which gives an access to parameters such as cohesion (Y-intercept) and traction (X-intercept). The second method is the measurement of avalanche angles in a rotating drum. A linear relation is found between this angle and the cohesion length, ratio of the cohesion derived from the yield locus and the aerated density. Finally, a model is proposed for the prediction of the cohesion and the yield locus at 3 kPa, using only 2 parameters easy to measure: the avalanche angle and the aerated density.
Mots-clés : Poudre Cohésion
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Clément Vanneste-Ibarcq, Thierry Melkior, Alain de Ryck. Warren-Spring based model for the shear yield locus of cohesive biomass powders. Powders and grains 2017 - 8th International Conference on Micromechanics on Granular Media, Jul 2017, Montpellier, France. art. 08005 - 4 p., ⟨10.1051/epjconf/201714008005⟩. ⟨hal-01630793⟩



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