Significance of shear induced structure in surfactants for drag reduction

Myška, J.; Štern, P.

doi:10.1007/s003960050315

Cited by 24 publications

(17 citation statements)

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“…However, the shear stress for SIS formation was independent of temperature for each EG/water system indicating that formation of SIS is related more closely to shear stress than to shear rate. However, DR systems with no detectable SIS in the shear rate ranges tested, as in this study, have been reported [35,36], so correlation between SIS and DR is uncertain. However, it is generally believed that long, flexible threadlike or wormlike micelles resembling high polymer chains are responsible for surfactant DR.…”

Section: Discussionmentioning

confidence: 66%

Co-solvent effects on drag reduction, rheological properties and micelle microstructures of cationic surfactants

Zhang

Schmidt

Talmon

et al. 2005

Journal of Colloid and Interface Science

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Section: Discussionmentioning

confidence: 66%

Co-solvent effects on drag reduction, rheological properties and micelle microstructures of cationic surfactants

Zhang

Schmidt

Talmon

et al. 2005

Journal of Colloid and Interface Science

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“…It is well known that the turbulent frictional drag of water can be reduced dramatically by adding small amounts of viscoelastic surfactants, which tend to form shear-induced phases [58][59][60][61]. The amount of drag reduction easily reaches values of 80 %.…”

Section: Introductionmentioning

confidence: 99%

Experimental and numerical investigations of the non-linear rheological properties of viscoelastic surfactant solutions: application and failing of the one-mode Giesekus model

Rehage

Fuchs

2015

Colloid Polym Sci

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In a series of experiments, we investigated the non-linear rheological properties of aqueous solutions of entangled wormlike micelles (WLMs) in steady-state shear flow and in large amplitude oscillating shear (LAOS) experiments. On grounds of their monoexponential stress relaxation properties, we studied semi-dilute solutions of the cationic surfactants cetylpyridinium chloride (CPyCl) or cetyltrimethylammonium bromide (CTAB) after addition of different amounts of sodium salicylate. The rheological data of these networks of WLMs were systematically compared with the numerically calculated results of the one-mode Giesekus constitutive equation. It turned out that the viscous resistance and the first normal stress difference, measured in steady-state shear flow, start-up, and relaxation experiments, were accurately predicted by the one-mode Giesekus model. In rheological tests, where we applied large oscillating shear amplitudes (LAOS), the transient shear stress could also approximately be described by means of the Giesekus model. The non-linear oscillating first normal stress difference, however, showed large deviations in respect to the theoretical predictions. These discrepancies between different rheological experiments, which we observed in oscillating and stationary flow, pointed to the existence of flow instabilities, which occurred in the LAOS regime. These, more complicated rheological processes, were induced by shear-banding and/or the presence of flow-induced phase transitions, which can occur in oscillatory and stationary shear. The non-linear phenomena, discussed in this article, are of general importance, and they can be equally observed in entangled solutions of flexible macromolecules.

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“…A variety of responses to shear have been observed with some solutions exhibiting shear thinning (orientation of micelles in the shearing direction) while others exhibit phenomena such as shear-induced structures (SIS), gelation and flow instabilities [8][9][10][11][12]. Lu et al [13] reported a zero first normal stress difference (N 1 ) solution which was drag reducing.…”

Section: Introductionmentioning

confidence: 99%

Small-angle neutron scattering study of shearing effects on drag-reducing surfactant solutions

Littrell

Thiyagarajan

et al. 2009

Journal of Colloid and Interface Science

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Significance of shear induced structure in surfactants for drag reduction

Cited by 24 publications

References 0 publications

Co-solvent effects on drag reduction, rheological properties and micelle microstructures of cationic surfactants

Co-solvent effects on drag reduction, rheological properties and micelle microstructures of cationic surfactants

Experimental and numerical investigations of the non-linear rheological properties of viscoelastic surfactant solutions: application and failing of the one-mode Giesekus model

Small-angle neutron scattering study of shearing effects on drag-reducing surfactant solutions

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