New limiting drag reduction and velocity profile asymptotes for nonpolymeric additives systems

Zakin, J. L.; Myška, J.; Chára, Zdeněk

doi:10.1002/aic.690421223

Cited by 126 publications

(88 citation statements)

References 17 publications

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“…The objective of the present study was to clarify which parameters adequately describe the pressure drop and heat transfer of surfactant solutions under fully [22,23] that although micro-structure of Habon G was mechanically degraded under high shear conditions, it recovered quickly--no matter how many times it was broken up by shear.…”

Section: Introductionmentioning

confidence: 99%

Drag reduction and heat transfer of surfactants flowing in a capillary tube

Hetsroni

Gurevich

Mosyak

et al. 2004

International Journal of Heat and Mass Transfer

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Section: Introductionmentioning

confidence: 99%

Drag reduction and heat transfer of surfactants flowing in a capillary tube

Hetsroni

Gurevich

Mosyak

et al. 2004

International Journal of Heat and Mass Transfer

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“…The torque of PAMC-Tween 20 mixture at 3000 rpm and 500 ppm was 25 while the torque of PAMC was 26 at same conditions. This decreasing in the torque was happened as a result of hydrophobic interaction between polymer surfactant mixtures [24]. We can see this interaction as a result of TEM test in Fig.…”

Section: ) Pipe Loopmentioning

confidence: 81%

Studying the Interaction between a New Mixture in Enhancing Drag Reduction Efficiency

Bari¹,

Faraj²

2015

IJCEA

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Abstract-Polymers are used as drag reducer in a strategic pipeline successfully for the past few decades due to its viscoelastic properties that can suppress the turbulent in pipelines. One of the many issues facing the use of these additives is its resistance to high shear forces during the transportation where it can be easily degraded where they pass them a pump. In the present work, polymer-surfactant complexes of anionic polymer and nonionic surfactant are investigated to prove its capability in enhancing the drag reduction and mechanism degradation performance. The interaction between anionic polymer Poly (acrylamide-codiallyl-dimethylammonium chloride) and nonionic surfactant tween 20 in aqueous solution has been studied by using rheology, rotating disk apparatus (RDA) and pipe loop techniques. The effect of polymer concentration, surfactant concentration and rotational speed in enhancing the drag reduction were studied. The results showed that almost 35% drag reduction can be obtained. In addition, the effect of the degradation on the mixtures as a function in the time has been discussed also. Index Terms-Polymer, surfactant, drag reduction, RDA.

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“…We consider that the main energy applied to the solution consists of two parts, the thermal energy (H) and shear energy (S). For cationic surfactants, under the right conditions of surfactant/counterion chemical structures, ratios, concentrations, and temperatures, they form rod-like micelles [14]. The length of rodlike micelles is about dozens of times diameter of the micelles which is about several nanometers, and the length of rod-like micelles increases with increasing surfactant concentration [9].…”

Section: Resultsmentioning

confidence: 99%

Combined Effects of Temperature and Reynolds Number on Heat Transfer Characteristics of a Cationic Surfactant Solution

Wang

Wei

2011

Advances in Mechanical Engineering

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The heat transfer characteristics of a dilute cationic surfactant solution, CTAC/NaSal aqueous solution, were experimentally investigated in a fully developed two-dimensional water channel flow at different temperatures ranging from 15• C to 60• C and at different mass concentrations, namely, 75, 100, and 200 ppm. The magnitudes of the maximum achievable heat transfer reduction (HTR) at the above three different surfactant concentrations are all about 90%. The cationic surfactant solution showed a great heat transfer reduction phenomenon, which was greatly affected by concentration, temperature, and Reynolds number. It was supposed that temperature and shear stress are two kinds of energy applied on the surfactant microstructure, which can be helpful to the surfactant network formation or dissociation depending on their values.

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New limiting drag reduction and velocity profile asymptotes for nonpolymeric additives systems

Cited by 126 publications

References 17 publications

Drag reduction and heat transfer of surfactants flowing in a capillary tube

Drag reduction and heat transfer of surfactants flowing in a capillary tube

Studying the Interaction between a New Mixture in Enhancing Drag Reduction Efficiency

Combined Effects of Temperature and Reynolds Number on Heat Transfer Characteristics of a Cationic Surfactant Solution

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