We present a scaling theory based on the analysis of A. K. Chesters [Chem. Eng. Res. Des. 69, 259 (1991)] that describes the time required to drain the thin, suspending fluid film that forms between two deformable capsules or vesicles as they are pushed toward each other by a constant force. Capsules and vesicles show a decrease in the drainage time with the pushing force, which results in the prediction that in a shear flow, the number of doublet formation events increases with the shear rate. Both trends are exactly opposite to what is expected and observed for deformable drops.
Abstract:The stability of the flow induced by the extrusion forming process of a cement based material is largely influenced by the relative migration between the lubricating liquid phase and the granular skeleton. In the present work, we propose linking rheological concepts and soil mechanics (consolidation theory, Darcy's law) to reach a simple criterion which predicts the extrusion ability of a mortar. Extrusion tests on studied mortar are performed at different ram velocities for criterion validation.
Résumé :La stabilité de l'écoulement du procédé de mise en forme par extrusion de matériaux à base cimentaire est largement influencée par la migration relative entre la phase liquide et le squelette granulaire. Dans ce travail, nous proposons de lier les concepts de rhéologie et de mécanique des sols (théorie de la consolidation, loi de Darcy) pour définir un critère simple qui prédit l'aptitude à l'extrusion d'un mortier. Des essais d'extrusion à différentes vitesses de piston sont ensuite réalisés pour valider le critère.
Zusammenfassung :Die Stabilität des durch Ausstoßungsformen-Prozeß eines Zements veranlassten Flusses stützte Material ist in hohem Maße unter Einfluß der Verhältnismigration zwischen Schmieren der flüssigen Phase und granulierten Skelettes. In der gegenwärtigen Arbeit haben wir vor, rheology und Boden-Mechanik-Begriffe (Verdichtungstheorie, Gesetz von Darcy) zu verbinden, um ein einfaches Kriterium zu reichen(erreichen), das die Ausstoßungsfähigkeit des Mörsers(Mörtels) voraussagt. Ausstoßungstests auf an verschiedenem Widder durchgeführten Zementteigen.
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