Comparison of oleyl and elaidyl isomer surfactant–counterion systems in drag reduction, rheological properties and nanostructure

Qi, Yunying; Kesselman, Ellina; Hart, David J.; Talmon, Yeshayahu; Mateo, Anthony; Zakin, J. L.

doi:10.1016/j.jcis.2010.10.067

Cited by 22 publications

(17 citation statements)

References 41 publications

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“…Then, the sample was quickly plunged into the liquid ethane before the ethane froze. This process was designed to prevent distortion of the suspension's microstructure by crystalline ice formation, such that subsequent SEM micrographs reflect the true microstructure of the original suspension . After thermal fixation, the sample cell was stored in liquid nitrogen.…”

Section: Experimental Methodsmentioning

confidence: 99%

In Situ Characterization of Spinel Nanoceramic Suspensions

et al. 2012

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In this study, an approach to characterize ceramic colloidal suspensions has been developed, based on vitrification of aqueous ceramic suspensions and microstructural characterization using cryogenic-temperature scanning electron microscopy (cryo-SEM), augmented by conventional rheological measurements. The flocculation phenomenon in as-milled and aged Mg-spinel (MgAl 2 O 4 ) aqueous suspensions was characterized. A microstructure based on hard particle agglomerates separated by long-chain deflocculant molecules was directly observed, and correlated to the rheological properties of the suspension. Several levels of flocculation were detected as a function of suspension preparation conditions. Although suspensions at solid-loading levels appropriate for ceramic processing cannot be characterized using conventional particle size measurement techniques, cryo-SEM can be used to measure characteristic sizes, and to distinguish between agglomerated and flocculated particles, opening a new approach for optimizing solid-loading conditions for slip casting in terms of viscosity and green density.

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Section: Experimental Methodsmentioning

confidence: 99%

In Situ Characterization of Spinel Nanoceramic Suspensions

et al. 2012

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“…The N 1 of EO12/NaSal (3 mM/7.5 mM) is shown in Figure 5 [57] that N 1 increased at shear rates near those at which shear-induced structure was observed. Figure 6 shows the good drag reduction of EO12/NaSal (3 mM/7.5 mM) from 10…”

Section: Viscoelasticity and Drag Reduction Of Eo12/nasalmentioning

confidence: 98%

Enhancing Heat Transfer of Drag-Reducing Surfactant Solution by an HEV Static Mixer with Low Pressure Drop

Shi

Wang

et al. 2011

Advances in Mechanical Engineering

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A novel high-efficiency vortex (HEV) static mixer was used to locally enhance the heat transfer coefficient of a drag-reducing fluid, Ethoquad O/12 (EO12) (3 mM) with sodium salicylate (NaSal) (5 mM). Significant enhancement of heat transfer coefficients was observed. The Nusselt numbers were three to five times those of normal drag-reducing flow without mixer and were close to those of water at high Reynolds number with only modest energy penalty. In contrast, a Helix static mixer increased Nusselt number slightly with very high pressure loss. A performance number was used for comparisons among the HEV static mixer, the Helix static mixer, and water without mixer. The HEV static mixer had a performance number comparable to that of water. The enhanced heat transfer by the HEV static mixer resulted from streamwise vortices generated by the inclined tabs, which increased the convective heat transfer in the radial direction.

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“…3 and 4 show that the critical Reynolds numbers for both the smooth and grooved channels firstly increase with increasing temperature, then decrease as temperature continues to rise. The reason is that, for surfactant solutions, the shear-induced structure (SIS) could be formed under the action of shear stress, which was perceived by many researchers as the drag-reducing mechanism of surfactants (Zhou et al, 2011;Qi et al, 2011). Furthermore, the Brownian motions of molecule are enhanced as temperature increases.…”

Section: Drag Reduction Performancementioning

confidence: 99%

Experimental Study on the Collaborative Drag Reduction Performance of a Surfactant Solution in Grooved Channels

Huang

Wei

2017

Braz. J. Chem. Eng.

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Turbulence with a relatively larger vortex is obtained in drag-reducing surfactant solution, which provides an excellent condition for the application of small scale grooves. In this work, the coupling drag reduction performance of surfactant solution and grooves was experimentally investigated to explore the complementary possibility between their drag reduction mechanisms. The cationic surfactant cetyltrimethyl ammonium chloride (CTAC) mixed with the counterion salt sodium salicylate (NaSal) was experimented in smooth or grooved channel, respectively, at the mass concentrations of 50-150 ppm. It was found that the surfactant solutions gave more effective drag reduction in the grooved channel by the interaction between the "restriction effect" and "peak effect" of grooves. Moreover, the critical temperature and critical Reynolds number of the surfactant solution were smaller in the grooved channel, and the friction factor in the grooved channel increased much more rapidly than that in the smooth channel when Re is larger than a critical value.

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Comparison of oleyl and elaidyl isomer surfactant–counterion systems in drag reduction, rheological properties and nanostructure

Cited by 22 publications

References 41 publications

In Situ Characterization of Spinel Nanoceramic Suspensions

In Situ Characterization of Spinel Nanoceramic Suspensions

Enhancing Heat Transfer of Drag-Reducing Surfactant Solution by an HEV Static Mixer with Low Pressure Drop

Experimental Study on the Collaborative Drag Reduction Performance of a Surfactant Solution in Grooved Channels

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