Applied Rheology: Publications

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Christian Wagner
Rheologentagung 2009 Berlin

Appl. Rheol. 19:3 (2009) 179-179

Cite this publication as follows:
Wagner C: Rheologentagung 2009 Berlin, Appl. Rheol. 19 (2009) 179.

J.K.G. Dhont, G. Gompper, D. Richter
Julich Soft Matter Days 2008

Appl. Rheol. 19:3 (2009) 176-178

Cite this publication as follows:
Dhont JKG, Gompper G, Richter D: Julich Soft Matter Days 2008, Appl. Rheol. 19 (2009) 176.

Leslie Yeo, Hsueh-Chia Chang, Weijia Wen
Advances in Microfluidics and Nanofluidics (Hong Kong, 2009)

Appl. Rheol. 19:3 (2009) 175-176

Cite this publication as follows:
Yeo L, Chang H, Wen W: Advances in Microfluidics and Nanofluidics (Hong Kong, 2009), Appl. Rheol. 19 (2009) 175.

Shiva Amirkaveei
A Comparison of the Rheology of four Wheat Flour Doughs via a Damage Function Model

Appl. Rheol. 19:3 (2009) 34305 (9 pages)

The basic rheological properties of two Persian wheat flours - Tajan (11 % protein) and Back Cross Roshan (8 % protein) and two Australian wheat flours-JANZ (12.9 % protein) and Rosella (8.6 % protein) have been characterized.These properties have been interpreted via a damage function model. All samples could be reasonably well described by the damage function model with a power-law relaxation spectrum. Although the shear stresses in the Australian samples were higher, the relaxation parameter G(1) and power-law exponent p for the Australian varieties were lower than those for the Persian samples and the damage functions were different. Since protein contents were different, this indicates that the amount of protein is not the sole determinant of softness in the samples. The damage function f was also calculated for all samples. This function gives a measure of the softening due to working or kneading of the samples at a given strain level.

Cite this publication as follows:
Amirkaveei S: A Comparison of the Rheology of four Wheat Flour Doughs via a Damage Function Model, Appl. Rheol. 19 (2009) 34305.

Maria Chatzimina, Georgios Georgiou, Andreas Alexandrou
Wall shear rates in circular Couette flow of a Herschel-Bulkley fluid

Appl. Rheol. 19:3 (2009) 34288 (8 pages, including corrigendum)

The objective of this work is to study quantitatively the errors introduced by the standard Newtonian and power-law assumptions used in the determination of the material properties of viscoplastic fluids from circular Couette experiments. The steady-state circular Couette flow of a Herschel-Bulkley fluid is solved assuming that the inner cylinder is rotating at constant speed while the outer one is fixed. Analytical solutions are presented for certain values of the power-law exponent. It is shown that the error in the computed wall shear rate, which is insignificant when the diameter ratio is closed to unity,may grow large depending on the diameter ratio and the material parameters.

Cite this publication as follows:
Chatzimina M, Georgiou G, Alexandrou A: Wall shear rates in circular Couette flow of a Herschel-Bulkley fluid, Appl. Rheol. 19 (2009) 34288.

Manuel Dolz, Francesco Corrias, Octavio Diez-Sales, Alejandro Casanovas, M.J. Hernandez
Influence of test times on creep and recovery behaviour of Xanthan gum hydrogels

Appl. Rheol. 19:3 (2009) 34201 (8 pages)

Rheological creep and recovery tests have been applied at different assay times to xanthan gum hydrogels at several concentrations. The Burger model has been successfully applied to fit the creep data and to analyze results. Increasing the xanthan gum concentration also increases the elastic and viscous components without changing the molecular distribution of these hydrogels. A semi-empirical equation considering the different elements of the Burger model has been proposed to analyze compliance behavior in recovery tests. The dependence of the relative contribution to deformation of the Maxwell and Kelvin-Voigt units upon xanthan gum concentration and recovery assay times has been evaluated. Since the recovery ratio is the same for all hydrogels, we suggest parallel structures with no mutual interactions are formed when increasing concentration.

Cite this publication as follows:
Dolz M, Corrias F, Diez-Sales O, Casanovas A, Hernandez M: Influence of test times on creep and recovery behaviour of Xanthan gum hydrogels, Appl. Rheol. 19 (2009) 34201.

A. Daimallah, A. Bouabdallah, B. Nsom, M. Adnane, A. Alemany
Onset of Instabilities in Taylor-Dean Flow of Yield-Stress Fluid

Appl. Rheol. 19:3 (2009) 33960 (8 pages)

We present an experimental study of the stability of the Taylor-Dean flow of well characterized suspensions of solid disks occurring between two horizontal coaxial cylinders. The inner cylinder is rotating and the outer cylinder is at rest. By means of a visualization technique, we determine the shape of the vortices which take place in the flow at the onset of the instability and the corresponding critical parameters against the flake concentration and the system aspect ratio.

Cite this publication as follows:
Daimallah A, Bouabdallah A, Nsom B, Adnane M, Alemany A: Onset of Instabilities in Taylor-Dean Flow of Yield-Stress Fluid, Appl. Rheol. 19 (2009) 33960.


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