Rheological behavior and birefringence investigations on drag-reducing surfactant solutions of tallow-(tris-hydroxyethyl)-ammonium acetate/sodiumsalicylate mixtures

Hofmann, Sandra; Štern, P.; Myška, J.

doi:10.1007/bf00366584

Cited by 24 publications

(17 citation statements)

References 31 publications

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“…5b-f that the critical shear ratesγ for SIS is increases by temperature, i.e. 2/s at 20 • and 10/s at 25 • with C m =300 ppm, whereas peak value of shear viscosity in SIS is decrease by temperature; this phenomena are consistent with those found by Bewersdorff [12]. Bewersdorff found that length of the micelle in surfactant solution increases when the temperature decreases from light scattering and electrical birefringence.…”

Section: Rheological Measurementssupporting

confidence: 78%

“…The viscosity curve of a surfactant containing long micelles is sometimes shown with a pattern which closely resembles the pattern of a polymer viscosity curve [11]. Nevertheless, many authors have shown different results and described a particular behavior of micelle forming surfactant which has been called a shear induced structure(SIS) [12]. It is not completely understood which rheological behavior is responsible for the drag reduction(DR) occurring in turbulent shear flows of surfactant solutions.…”

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confidence: 98%

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Experimental study on the effects of shear induced structure in a drag-reducing surfactant solution flow

2008

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In this paper, The drag reduction characteristics of surfactant solutions have been experimentally studied, as well as, the shear viscosities of turbulent drag-reducing surfactant solution have been measured as a function of concentration, shear rate and temperature by using AG-G2 (TA Instruments, New Castle, USA) rheometer. In comparison the rheological property with the macroscopic behavior of the solutions in turbulent channel flow, a deeper insight into the mechanisms of drag-reducing surfactant solution has been obtained. For no shear induced structure of surfactant solutions they just show features shear thinning, but the drag reduction is very significant phenomenon. Surfactant solution of the shear induced structure is not a surfactant fluid drag reduction of the necessary elements.Keywords Drag-reduction · Rheology · Shear induced structure · Surfactant solution InstructionBy dissolving a minute amount of additives such as cylindrical fibers and long-chain polymers surfactants in water or in organic solvents, the frictional drag of turbulent flow through pipes and channels can be reduced dramatically [1][2][3][4]. However, polymer solutions are strongly affected by mechanical degradation, which can result in shorter lifetime of drag reduction effectiveness. Surfactants were found in the last two decades also to reduce the friction drag by 70-80% being less affected by mechanical degradation [5][6][7][8]. Recently, surfactants have been widely accepted as the most practical drag reducing additives in distinct heating and cooling systems (DCH) for reducing pumping power [9,10]. Drag-reducing surfactants show a great variety in rheological behavior. The viscosity curve of a surfactant containing long micelles is sometimes shown with a pattern which closely resembles the pattern of a polymer viscosity curve [11]. Nevertheless, many authors have shown different results and described a particular behavior of micelle forming surfactant which has been called a shear induced structure(SIS) [12]. It is not completely understood which rheological behavior is responsible for the drag reduction(DR) occurring in turbulent shear flows of surfactant solutions. Before the SIS is formed, micelles can rotate freely without impinging on each other. There is no drag reduction at this condition (before the SIS is formed). When a critical shear rate is exceeded, the shear viscosity of the fluid suddenly increases due to the formation of the SIS [13][14][15]. This critical shear rate, as well as the value of the shear viscosity itself, depends on the surfactant, the concentration of ions, the temperature, and, surprisingly, also depends on the geometry of the viscometer [16,17]. After the SIS is reached, the rod-like micelles align completely in the flow direction.In the present article, the rheological properties as a function of temperature, surfactant concentration and the shear rate have been experimentally studied with a stress-controlled rheometer AR-G2(TA Instruments).

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Section: Rheological Measurementssupporting

confidence: 78%

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confidence: 98%

Experimental study on the effects of shear induced structure in a drag-reducing surfactant solution flow

2008

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“…Hofmann et al (11) studied the rheological and birefringence behavior on drag-reducing surfactant solutions of tallow-(tris-hydroxy ethyl)-ammonium acetate (ETHOQUAD T/13-50)/sodium salicylate (NaSal) mixtures. The addition of NaSal reduced the drag when shear-induced supramicellar structures (SIS) were formed.…”

Section: Introductionmentioning

confidence: 99%

Rennet-Induced Milk Coagulation by Continuous Steady Shear Stress

Konuklar

Gunasekaran

2002

Journal of Colloid and Interface Science

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“…The presence of (or transition to) TLM entanglement results in other unique phenomena such as viscoelasticity [4][5][6][7][8], flow birefringence [9][10][11][12] and shear thickening and shear-induced structure (SIS) [13][14][15]. It is generally believed that organic counterions ଝ This paper was originally submitted at the PRATO conference.…”

Section: Introductionmentioning

confidence: 99%

Effects of chemical structures of para-halobenzoates on micelle nanostructure, drag reduction and rheological behaviors of dilute CTAC solutions

Kesselman

Talmon

et al. 2008

Journal of Non-Newtonian Fluid Mechanics

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Rheological behavior and birefringence investigations on drag-reducing surfactant solutions of tallow-(tris-hydroxyethyl)-ammonium acetate/sodiumsalicylate mixtures

Cited by 24 publications

References 31 publications

Experimental study on the effects of shear induced structure in a drag-reducing surfactant solution flow

Experimental study on the effects of shear induced structure in a drag-reducing surfactant solution flow

Rennet-Induced Milk Coagulation by Continuous Steady Shear Stress

Effects of chemical structures of para-halobenzoates on micelle nanostructure, drag reduction and rheological behaviors of dilute CTAC solutions

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