An investigation of squeeze flow as a viable technique for determining the yield stress |
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Authors: | Brooks D. Rabideau Christophe Lanos Philippe Coussot |
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Affiliation: | (1) Laboratoire de Matériaux et des Structures du Génie Civil, 2 Allée Kepler, 77420 Champs sur Marne, France;(2) Institut National des Sciences Appliquées, 20 Avenue des Buttes de Coesmes, CS 14315, 35043 Rennes, France |
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Abstract: | A systematic study of squeeze flow (SF) was performed on different concentrations of Carbopol with varying yield stresses. A sample of constant volume was placed between two parallel plates and a series of constant force steps applied, following the plate separation as a function of time. Precise rheological measurements of the model yield stress fluids were performed in addition to the well-controlled SF tests. These rheological measurements were used in conjunction with the SF equations to determine the time-dependent plate separation, allowing a direct comparison of theory and experiment throughout the entire test. The limiting height achieved during constant force SF reveals information about the yield stress of the fluid as predicted by the theory. It appears that by carefully controlling the experimental conditions of the squeeze test one can obtain yield stress values that agree with the rheological measurements within 10%. Additionally, the validity of the lubricational theory was tested; not only for the determination of the yield stress but throughout the flow as well. |
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Keywords: | Yield stress Squeeze flow Carbopol Herschel-Bulkley Wall slip Squeezing |
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