Characterisation of non-newtonian fluids using a back-extrusion technique
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Date
Authors
Filip, P.
David, J.
Pivokonsky, R.
Journal Title
Journal ISSN
Volume Title
Publisher
International Conference on Heat Transfer, Fluid Mechanics and Thermodynamics
Abstract
Paper presented at the 5th International Conference on Heat Transfer, Fluid Mechanics and Thermodynamics, South Africa, 1-4 July, 2007.
At present standard rheometers provide sufficiently precise measurements characterising behaviour of non-Newtonian materials. In practice, this accuracy is not always necessary, and the methods providing relatively cheap, fast and sufficient measurements of the rheological characteristics are fully acceptable. Back extrusion - representing one of these methods - is based on plunging of a circular rod into an axisymmetrically located circular cup containing the experimental sample. Formerly this method was applied for a characterisation of power-law, Bingham and Herschel-Bulkley fluids. The aim of this contribution is to present a sufficiently simple user-friendly procedure how to determine the individual rheological parameters appearing in the Vočadlo model (sometimes called Robertson-Stiff one) - yield stress, consistency parameter and flow behaviour index.
At present standard rheometers provide sufficiently precise measurements characterising behaviour of non-Newtonian materials. In practice, this accuracy is not always necessary, and the methods providing relatively cheap, fast and sufficient measurements of the rheological characteristics are fully acceptable. Back extrusion - representing one of these methods - is based on plunging of a circular rod into an axisymmetrically located circular cup containing the experimental sample. Formerly this method was applied for a characterisation of power-law, Bingham and Herschel-Bulkley fluids. The aim of this contribution is to present a sufficiently simple user-friendly procedure how to determine the individual rheological parameters appearing in the Vočadlo model (sometimes called Robertson-Stiff one) - yield stress, consistency parameter and flow behaviour index.
Description
Keywords
Back extrusion, Behaviour of non-Newtonian materials, Vočadlo model, Robertson-Stiff model
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Citation
Filip, P, David, J & Pivokonsky, R 2007, Characterisation of non-newtonian fluids using a back-extrusion technique, Paper presented to the 5th International Conference on Heat Transfer, Fluid Mechanics and Thermodynamics, South Africa, 1-4 July 2007.