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Idowu T. Dosunmu, Subhash N. Shah
Steady shear and dynamics properties of drag reducing Su.Factant solutions

Appl. Rheol. 25:1 (2015) 12539 (10 pages)

The rheological behavior of oilfield Su.Factants (Aromox™ APA-T and APA-TW) at various concentrations was studied using steady shear and dynamic testing. The results showed that the solutions exhibit non-Newtonian behavior at all concentrations, with their rheological character influenced by the temperature and ionic content of the base fluid. Temperature was observed to have a significant effect on viscosity and dynamic data. The apparent viscosity at different temperatures could be reduced to a single master curve using horizontal and vertical shift factors. However, satisfactory scaling could not be attained for the dynamic or viscoelastic data. Molecular scaling using characteristic time for data at different concentrations proved unsuccessful due to the strong non-Newtonian character of Su.Factant solutions. Scaling relations between rheological parameters and concentration indicated the presence of long micelles in APA-T solutions. APA-TW solutions, on the other hand, contained branched micelles.

Cite this publication as follows:
Dosunmu IT, Shah SN: Steady shear and dynamics properties of drag reducing surfactant solutions, Appl. Rheol. 25 (2015) 12539.

Wu Ge
Turbulent Drag Reduction by Su.Factant Additives (FC Li, B Yu, JJ Wei, Y Kawaguchi)

Appl. Rheol. 23:2 (2013) 84-85

Cite this publication as follows:
Ge W: Turbulent Drag Reduction by Surfactant Additives (FC Li, B Yu, JJ Wei, Y Kawaguchi), Appl. Rheol. 23 (2013) 84.

Fernando Su, Suzana C. S. Lannes
Rheological evaluation of the structure of ice cream mixes varying fat base

Appl. Rheol. 22:6 (2012) 63871 (7 pages)

This paper discusses the influence of fat type in the structure of ice cream, during its production by means of rheo-optical analysis. Fat plays an important part in the ice cream structure formation. It's responsible for the air stabilization, flavor release, texture and melting properties. The objective of this study was to use a rheological method to predict the fat network formation in ice cream with three types of fats (hydrogenated, low trans and palm fat). The three formulations were produced using the same methodology and ratio of ingredients. Rheo-optical measurements were taken before and after the ageing process, and the maximum compression force, overrun and melting profile were calculated in the finished product. The rheological analysis showed a better response from the ageing process from the hydrogenated fat, followed by the low trans fat. The formulation with palm fat showed greater differences between the three, where through the rheological tests a weaker destabilization of the fat globule membrane by the emulsifier was suggested. The overrun, texture measurements and meltdown profile has shown the distinction on the structure formation by the hydrogenated fat from the other fats.

Cite this publication as follows:
Su F, Lannes SCS: Rheological evaluation of the structure of ice cream mixes varying fat base, Appl. Rheol. 22 (2012) 63871.

Peter Fischer
Su.Face chemistry of solid and liquid interfaces (H. Yildirim Erbil)

Appl. Rheol. 17:3 (2007) 129

Cite this publication as follows:
Fischer P: Surface chemistry of solid and liquid interfaces (H. Yildirim Erbil), Appl. Rheol. 17 (2007) 129.

David C. Venerus
Free Su.Face Effects on Normal Stress Measurements in Cone and Plate Flow

Appl. Rheol. 17:3 (2007) 36494 (6 pages)

The effects of free Su.Face shape on normal stress difference measurements in cone and plate flow are investigated. The analysis shows that the stress field is significantly altered by deviations of the free Su.Face from an ideal (spherical) shape. For the cone and partitioned plate technique, it is shown how modest deviation from a spherical free Su.Face shape can lead to errors of roughly 10% in the measured normal stress differences.

Cite this publication as follows:
Venerus DC: Free Surface Effects on Normal Stress Measurements in Cone and Plate Flow, Appl. Rheol. 17 (2007) 36494.

A. Krope, J. Krobe, L.C. Lipus
A Model for Velocity Profile in Turbulent Boundary Layer with Drag Reducing Su.Factants

Appl. Rheol. 15:3 (2005) 152-159

A new model for mean velocity profile of turbulent water flow with added drag-reducing Su.Factants is presented in this paper. The general problem of drag due to frictional resistance is reviewed and drag reduction by the addition of polymers or Su.Factants is introduced. The model bases on modified Prandtl's mixing length hypothesis and includes three parameters, which depend on additives and can be evaluated by numerical simulation from experimental datasets. The advantage of the model in comparison with previously reported models is that it gives uniform curve for whole pipe section and can be determined for a new Su.Factant with less necessary measurements. The use of the model is demonstrated for Su.Factant Habon-G as an example.

Cite this publication as follows:
Krope A, Krope J, Lipus LC: A Model for Velocity Profile in Turbulent Boundary Layer with Drag Reducing Surfactants, Appl. Rheol. 15 (2005) 152.

R. Banerjee, R. R. Puniyan
Effect of Eucalyptus Oil Added Su.Factants on the Rheology of Mucus Gel Simulants

Appl. Rheol. 9:6 (1999) 254-261

Cite this publication as follows:
Banerjee R, Puniyan RR: Effect of Eucalyptus Oil Added Surfactants on the Rheology of Mucus Gel Simulants, Appl. Rheol. 9 (1999) 254.

Jean-Francois Berret
Rheology, rheo-physics and flow-induced structures of liquid crystalline polymers, Su.Factants and block copolymers

Appl. Rheol. 9:3 (1999) 126

Cite this publication as follows:
Berret J-F: Rheology, rheo-physics and flow-induced structures of liquid crystalline polymers, surfactants and block copolymers, Appl. Rheol. 9 (1999) 126.

P Fischer
The Nonlinear Rheological Response of Viscoelastic Su.Factant Solutions and its Quantitative Description by the Giesekus Model

Appl. Rheol. 7:2 (1997) 58

Cite this publication as follows:
Fischer P: The Nonlinear Rheological Response of Viscoelastic Surfactant Solutions and its Quantitative Description by the Giesekus Model, Appl. Rheol. 7 (1997) 58.

H Magdanz, I Peter, M Prokop
Rheometric and Su.Face Energy Characterization of Varnish Resin Solutions with Low Solvent Content

Appl. Rheol. 6:1 (1996) 21

Cite this publication as follows:
Magdanz H, Peter I, Prokop M: Rheometric and Surface Energy Characterization of Varnish Resin Solutions with Low Solvent Content, Appl. Rheol. 6 (1996) 21.


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