Surfactant Drag Reduction

Zakin, J. L.; Lu, Bin; Bewersdorff, H. W.

doi:10.1515/revce.1998.14.4-5.253

Cited by 220 publications

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“…They are mostly used in food, emulsions, cosmetics, paints, pharmaceuticals, adhesives, and many household products. Therefore, knowledge on the structure and dynamics of wormlike micellar systems is important for the optimization of these applications [12][13][14][15][16] . Salt induced wormlike micelles in ionic surfactants have been widely reported [17][18][19][20] .…”

mentioning

confidence: 99%

Wormlike Micelles in Mixed Amino Acid Surfactant/Nonionic Surfactant Aqueous Systems and the Effect of Added Electrolytes

Shrestha¹,

Rodríguez‐Abreu²,

Aramaki³

2009

J. Oleo Sci.

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confidence: 99%

Wormlike Micelles in Mixed Amino Acid Surfactant/Nonionic Surfactant Aqueous Systems and the Effect of Added Electrolytes

Shrestha¹,

Rodríguez‐Abreu²,

Aramaki³

2009

J. Oleo Sci.

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“…For polymers, drag reduction is due to the large elongational viscosity of the polymer solution; this stabilizes the turbulent boundary layer, leading to less turbulent energy generation, and hence less dissipation [3,4]. For surfactants, the phenomenon is still ill understood, in spite of the enormous attention the subject attracted over the past few decades, and the fact that due to their reversible degradation of the aggregates, surfactant solutions are better adapted to industrial applications than polymers that degrade irreversibly [5]. Surfactant drag reduction is uniquely found for systems forming wormlike micelles.…”

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confidence: 99%

Turbulent drag reduction by surfactants

Drappier¹,

Divoux²,

Amarouchène³

et al. 2006

Europhys. Lett.

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.Yz -Drag reduction. PACS. 82.70.Uv -Surfactants, micellar solutions, vesicles, lamellae, amphiphilic systems (hydrophilic and hydrophobic interactions). PACS. 83.50.Rp -Wall slip and apparent slip.Abstract. -Drag reduction of turbulent flows by surfactant additives is studied. The surfactant forms a shear-induced gel phase in both rheological and turbulent flows. In both flows, the fracture of the gel causes an apparent wall slip. The slipping in turbulent flows decreases the wall friction and therefore immediately leads to drag reduction, providing a detailed mechanism for drag reduction by surfactants.Introduction. -A spectacular reduction of energy losses in turbulent flows can be achieved by the addition of small amounts of certain polymers or surfactants [1, 2]. For polymers, drag reduction is due to the large elongational viscosity of the polymer solution; this stabilizes the turbulent boundary layer, leading to less turbulent energy generation, and hence less dissipation [3,4]. For surfactants, the phenomenon is still ill understood, in spite of the enormous attention the subject attracted over the past few decades, and the fact that due to their reversible degradation of the aggregates, surfactant solutions are better adapted to industrial applications than polymers that degrade irreversibly [5]. Surfactant drag reduction is uniquely found for systems forming wormlike micelles. These micelles are self-assembled structures in which the surfactants form tubular structures with a diameter roughly twice the size of a surfactant molecule and a length that can be thousands of times the molecular size. The flow behavior of dilute solutions of such wormlike micelles in both laminar and turbulent

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“…This reduction of heat transfer coefficients is called heat transfer reduction (HTR). Research has shown that the amount of HTR is always more than the amount of DR [10], and HTR can approach 90% [11].…”

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confidence: 99%

Heat transfer enhancement in turbulent drag reducing surfactant solutions by agitated heat exchangers

Maxson

Watson

Karandikar

et al. 2017

International Journal of Heat and Mass Transfer

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Drag reducing solutions can reduce turbulent pressure loss by nearly 90% and can decrease pumping energy requirements and increase flow rates in fluid flow systems. Unfortunately, drag reduced flow is accompanied by lower convective heat transfer coefficients, which is undesirable in district heating and cooling systems, heated tube bundles for undersea petroleum production, and other recirculating heat transport systems.In this study, three different rotating agitators were installed inside the inner tube of a concentric tube heat exchanger to enhance heat transfer in a surfactant drag reducing solution. An earlier mathematical model for heat transfer in scraped surface heat exchangers was adapted for this application so that the effectiveness of agitators with different geometries could be compared quantitatively. In addition, an enhancement efficiency factor was defined to compare power efficiency with previous methods. It was found that agitation can increase the inner heat transfer coefficient to exceed that of pure water; heat transfer reduction compared to water was reduced from 60% to -20%. In addition, the enhancement can be more energy-efficient than that of previously studied static mixers.

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Surfactant Drag Reduction

Cited by 220 publications

References 0 publications

Wormlike Micelles in Mixed Amino Acid Surfactant/Nonionic Surfactant Aqueous Systems and the Effect of Added Electrolytes

Wormlike Micelles in Mixed Amino Acid Surfactant/Nonionic Surfactant Aqueous Systems and the Effect of Added Electrolytes

Turbulent drag reduction by surfactants

Heat transfer enhancement in turbulent drag reducing surfactant solutions by agitated heat exchangers

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