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Roney L. Thompson, Monica F. Naccache
VII Brazilian Conference on Rheology (BCR 2015)
Appl. Rheol. 26:1 (2016) 52-52
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► Cite this publication as follows:
Thompson RL, Naccache MF: VII Brazilian Conference on Rheology (BCR 2015), Appl. Rheol. 26 (2016) 52.
Paulo R. de Souza Mendes, Alexandra A. Alicke, Roney L. Thompson
Parallel-plate geometry correction for transient rheometric experiments
Appl. Rheol. 24:5 (2014) 52721 (10 pages)
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It is well known that the shear and shear rate are not uniform in the azimuthal flow within the gap between parallel concentric
disks - perhaps the most versatile among the geometries used in rheometry. This flow inhomogeneity represents a disadvantage,
because the data analysis becomes intricate. Typically the stress is calculated at the rim with the assumption that
it varies linearly with the radial coordinate, and then a correction is applied. This correction may be very large, depending on
the nature of the sample, type of test, and range of parameters. While for steady-state shear flow different methods for correcting
the stress are available, for transient flows they are rather scarce and in some cases unavailable. In this work we analyze
in detail the stress correction for the main rheometric experiments, and discuss when it is needed. To this end, we performed
different tests with a commercial hair gel and a polyacrylamide solution. For oscillatory flows, a simple equation to
correct the stress amplitude is obtained in terms of the amplitudes of the torque and shear rate.
► Cite this publication as follows:
deSouzaMendes PR, Alicke AA, Thompson RL: Parallel-plate geometry correction for transient rheometric experiments, Appl. Rheol. 24 (2014) 52721.
Monica F. Naccache, Roney L. Thompson
V Brazilian Conference on Rheology (BCR 2010)
Appl. Rheol. 20:6 (2010) 376-377
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► Cite this publication as follows:
Naccache MF, Thompson RL: V Brazilian Conference on Rheology (BCR 2010), Appl. Rheol. 20 (2010) 376.
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