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The XVth International Workshop on Numerical Methods for Non-Newtonian Flows (XVth IWNMNNF 2007) was held on the island of Rhodes, Greece, in June 6 - 10, 2007. Since their inception in 1979, in Providence, Rhode Island, USA, the workshops are rotated biennially between North America and Europe. This was the first time the meeting was held in Greece. Rhodes Island was a proper destination, as the meetings have come a full circle after almost 30 years of frantic activity, which have seen workshop meetings in castles, lakes, islands, seasides. Rhodes, as the capital of the Dodecanese Islands, combines all of the above, and has been a place of tourism and holidays since antiquity. The XVth IWNMNNF was by all measures a truly international event, drawing around 60 scientists and engineers from 18 countries around the world. The Workshop included a plenary lecture by Roger Tanner, from University of Sydney, Australia, and 7 thematic sessions. [more]► Cite this publication as follows:

Mitsoulis E, Mavrantzas VG: Numerical Methods for Non-Newtonian Flows - XVth IWNMNNF 2007, Appl. Rheol. 17 (2007) 354.

Genetic Programming (GP) is used to estimate the functions that describe the torque and the force acting on the external sphere due to steady state motion of viscoelastic fluid between two eccentric spheres. The GP has been running based on experimental data of the torque at different eccentricities to produce torque for each target eccentricity. The angular velocity of the inner sphere and the eccentricity of the two spheres have been used as input variables to find the discovered functions. The experimental, calculated and predicted torque and forces are compared. The discovered function shows a good match to the experimental data.We find that the GP technique is a good new mechanism of determination of the force and torque of fluid in eccentric sphere model.► Cite this publication as follows:

Elbakry M, Radi A: Genetic programming approach for flow of steady state fluid between two eccentric spheres, Appl. Rheol. 17 (2007) 68210.

The assumptions implicit in the simplified expressions used to convert the torque-rotational speed data of parallel-disk viscometry into rim shear rate and rim shear stress are identified. The rim shear stress generated by the simplified expression is compared against the actual rim shear stress. The error involved is quantified for two standard rheological models and for a set of laboratory data. Under normal operation conditions of parallel-disk viscometers this error was found to be within the acceptable limit. However, for highly shear thinning fluids and for fluids exhibiting yield stress this error can become very large. The suitability of the approximate rim shear stress in wall slip determination is then briefly discussed.► Cite this publication as follows:

LeongYeow Y, Leong Y, Khan A: Error Introduced by a Popular Melthod of Processing Parallel-Disk Viscometry Data, Appl. Rheol. 17 (2007) 66415.

The dynamic viscoelastic properties of liquid crystalline polymer (LCP) and polyethylene terephthalate (PET) blends were studied at two different temperatures: 265^{o}C at which LCP was in solid state and 285^{o}C at which LCP was in molten state. The PET was in molten state at both the temperatures. The storage modulus, G', loss modulus, G'', dynamic viscosity, η', of blends with different compositions were evaluated and compared. The morphology of these samples was studied using scanning electron microscope, which exhibited composition dependency. A maxima was observed in the viscosity versus composition plot corresponding to 90/10 LCP/PET blend at 285^{o}C. The G' versus G'' plots demonstrated the composition dependency of LCP/PET blends.► Cite this publication as follows:

Hashmi SAR, Kitano T: Effects of State Change of Liquid Crystalline Polymer on Dynamic Visco-elasticity of its Blends with Polyethylene-terephthalate, Appl. Rheol. 17 (2007) 64510.

A newly designed and constructed sliding plate rheometer is used to measure the high frequency (210 Hz) linear viscoelastic properties of two model polymers: polybutene (PB) and polydimethylsiloxane (PDMS). Using well-known rheological models, extrapolations of the viscoelastic measurements obtained on a rotational parallel plate rheometer to a frequency of 210 Hz are used to assess the performance of the high frequency sliding plate rheometer. Good agreement between the extrapolated and measured data demonstrates the ability of the sliding plate rheometer to measure the high frequency rheological properties of both Newtonian and shear-thinning materials.► Cite this publication as follows:

Braybrook CA, Lee JA, Bates PJ, Kontopoulou M: Development of a Sliding Plate Rheometer to Measure the High Frequency Viscoelastic Properties of Polymer Melts, Appl. Rheol. 17 (2007) 62563.

We apply the Landmark Paper Index (LPI), calculate and analyze indices for all papers published in rheological journals (`η-journals') between 1991 and 2007. We discuss the effect of formal criteria on the LPI.► Cite this publication as follows:

Kroger M: Landmark paper index: Application to rheological (η) journals, Appl. Rheol. 17 (2007) 66494.

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