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Turbulent Drag Reduction by Surfactant 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.

Two types of starch gels made with various starch/water concentrations were studied in terms of their mechanical behaviour. Indentation tests were performed which revealed a rate independent load-deflection response. An inverse analysis based on the Marquardt-Levenberg optimisation algorithm and Finite Element Analysis was used to derive the stress-strain behaviour from the indentation data. The inverse predictions for the stress-strain curves are in good agreement with the direct measurements from uniaxial compression and shear tests up to high values of strain. The validity of the method was proven for both self-supporting and non self-supporting gels, with initial moduli ranging from a very small 60 Pa to 55 kPa. Thus the indentation characterisation method is proven as a powerful, fast and efficient way of evaluating and/or monitoring the behaviour of gels.► Cite this publication as follows:

Gamonpilas C, Charalambides M, Williams J, Dooling P, Gibbon S: On the characterization of the mechanical behaviour of starch gels using indentation techniques, Appl. Rheol. 20 (2010) 33283.

In this paper, by means of Advanced Rheometric Expanded System (ARES), oscillatory and steady shear behavior of binary mixtures of a quaternary ammonium based ionic liquid [Me_{3}NC_{2}H_{4}OH]+[Zn_{2}Cl_{5}]- with ethanol (EtOH) were determined at 25 C and 25-50 C, respectively. The effects of shear rate, temperature and concentration on viscosity were elucidated sufficiently. It was found that the solutions show pseudo-plastic behavior at low shear rate and Newtonian property at higher shear rate. The addition of EtOH caused a substantial decrease in viscosity of the ionic liquid and the viscosity of binary mixtures could be described by an exponential equation. Arrhenius Equation and Power Law equation were applied to describe the respective effects of temperature and shear rate on viscosity. Activation energy derived from Arrhenius equation decreased with increasing the EtOH fraction in the mixture.► Cite this publication as follows:

Li Q, Wu G, Liu Y, Luo Y: A rheological study of binary mixtures of Ionic Liquid [Me3NC2H4OH]+[Zn2Cl5]- and ethanol, Appl. Rheol. 16 (2006) 334.

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