Rheological and mechanical characterization of wet agglomerates processed in low shear mixer
2013
Rondet, E. | Ruiz, Thierry | Cuq, Bernard | Démarche intégrée pour l'obtention d'aliments de qualité (UMR Qualisud) ; Centre de Coopération Internationale en Recherche Agronomique pour le Développement (Cirad)-Université Montpellier 1 (UM1)-Université Montpellier 2 - Sciences et Techniques (UM2)-Centre international d'études supérieures en sciences agronomiques (Montpellier SupAgro)-Avignon Université (AU)-Université de La Réunion (UR)-Université de Montpellier (UM)-Institut national d’études supérieures agronomiques de Montpellier (Montpellier SupAgro) | Ingénierie des Agro-polymères et Technologies Émergentes (UMR IATE) ; Centre de Coopération Internationale en Recherche Agronomique pour le Développement (Cirad)-Institut National de la Recherche Agronomique (INRA)-Université Montpellier 2 - Sciences et Techniques (UM2)-Centre international d'études supérieures en sciences agronomiques (Montpellier SupAgro)-Université de Montpellier (UM)-Institut national d’études supérieures agronomiques de Montpellier (Montpellier SupAgro) | Languedoc-Roussillon Region through the Chercheur d'Avenir project "Energy, Powder and Interface"
The mechanical and rheological characterization of structures processed by wet agglomeration is a way to study their structural organization. The aim of this study is to submit and discuss the results of mechanical and rheological characterization of wet agglomerates obtained by wetting cereal powder in low shear mixer. For various conditions of wetting, these properties are obtained thanks to shearing and compression tests led on a powder rheometer (FT4 - Freeman Technology, UK). The analysis of the mechanical and rheological properties of agglomerates obtained after wet agglomeration process has been carried out thanks to an approach based on soil science and granular media. This approach makes it possible to highlight the great influence of water content on the rheological behavior of the agglomerates bed bulk: Its increase results in variations of the friction between grains together with variations in their cohesion. These variations are analyzed regarding the modifications in the population balance induced by the increase in water content. Uniaxial compression tests make it possible to calculate, through three compression models (Kawakita, Hackel and Adams), the agglomerates strength. It is shown that it evolves according to a decreasing power law when water content increases. These results are in accordance with the fractal description of the agglomeration process that support a decrease of the agglomerates solid volume fraction, and thus of their resistance, with water content. (c) 2013 Elsevier Ltd. All rights reserved.
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