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Claire Elkins, Elodie Aumaitre
Lorentz Center Workshop: Dynamics of Complex Fluid-Fluid Interfaces

Appl. Rheol. 22:3 (2012) 145-145

Cite this publication as follows:
Elkins C, Aumaitre E: Lorentz Center Workshop: Dynamics of Complex Fluid-Fluid Interfaces, Appl. Rheol. 22 (2012) 145.

Nariman Ashrafi
Effects of Temperature on Rheology of Olive Oils

Appl. Rheol. 22:3 (2012) 34203 (7 pages)

In this study, the rheological properties of different samples of olive oils purchased from the same producer were investigated in a wide range of temperature. In addition, at constant temperatures, the shear rate was varied to obtain heating effects. It was found that all samples reach a minimum viscosity in the temperature range of 120 - 150°C before thickening to higher viscosities. The viscosity remained almost unchanged in high shear rates regardless of temperature, indicating no shear thinning effects. No thixotropic effects were observed for the olive oils. These findings can provide insight into the microstructural, physiological and sensory changes at frying (high) temperatures.

Cite this publication as follows:
Ashrafi N: Effects of Temperature on Rheology of Olive Oils, Appl. Rheol. 22 (2012) 34203.

Alexander Malkin, Alexander Semakov, Valery Kulichikhin
Macroscopic modeling of a single entanglement at high deformation rates of polymer melts

Appl. Rheol. 22:3 (2012) 32575 (9 pages)

We constructed a macroscopic model illustrating behavior of a single entanglement knot of macromolecules in a melt and examined its behavior at different deformation rates. A model consists of flexible elastic strips, which are tied in a granny knot (modeling not a real geometrical form of entanglements but their behavior at relatively easy sliding). This scheme models the situation when elastic energy exceeds the energy of the Brownian motion. The behavior of a knot chosen for modeling is different at low and high deformation rates. In the previous case knots disentangle as predicted by the .tube. model, elastic strips slip out a knot and this is an illustration of flow. In the latter case, knots tighten up, further extension of strips leads to the increase in stresses up to breakup of a strip. This effect imitates the transition from the flow to the rubbery-like behavior of polymer melts, when flow becomes impossible due to the formation of quasi-permanent entanglements. The general dimensionless correlation for the process under discussion has been proposed.

Cite this publication as follows:
Malkin A, Semakov A, Kulichikhin V: Macroscopic modeling of a single entanglement at high deformation rates of polymer melts, Appl. Rheol. 22 (2012) 32575.

Mykhaylo Myslyuk, Iurii Salyzhyn
The evaluation of rheological parameters of non-Newtonian fluids by rotational viscosimetry

Appl. Rheol. 22:3 (2012) 32381 (7 pages)

The methodology of evaluation of rheological parameters of non-Newtonian fluids on the basis of rotational viscosimetry data has been described, which is based upon rigorous solution of Couette flow equation and considers informational content of experiments. Class of models is formed for rheologically stationary systems, biviscosity ones included. Functional features of methodology and its generalization for the interpretation of rheological properties measurements results according to plans of experiments have been outlined.

Cite this publication as follows:
Myslyuk M, Salyzhyn I: The evaluation of rheological parameters of non-Newtonian fluids by rotational viscosimetry, Appl. Rheol. 22 (2012) 32381.


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