June 17, 2021

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Drag Reduction of Complex Mixtures

Drag Reduction of Complex Mixtures
Author : Keizo Watanabe
Publisher : Academic Press
Release Date : 2018-06-15
Category : Technology & Engineering
Total pages :222
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Drag Reduction of Complex Mixtures discusses the concept of drag reduction phenomena in complex mixtures in internal and external flows that are shown experimentally by dividing flow patterns into three categories. The book is intended to support further experiments or analysis in drag reduction. As accurately modeling flow behavior with drag reduction is always complex, and since drag reducing additives or solid particles are mixed in fluids, this book covers these complex phenomena in a concise, but comprehensive manner. Comprehensively addresses a range of drag reduction themes involving different kinds of complex mixtures Provides data to support further experimentation and computer modeling of drag in complex flow Includes an introduction to the nature and characteristics of different kinds of complex mixtures

Rheology of Drag Reducing Fluids

Rheology of Drag Reducing Fluids
Author : Aroon Shenoy
Publisher : Springer Nature
Release Date : 2021
Category :
Total pages :129
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Proceedings

Proceedings
Author : Institution of Civil Engineers (Great Britain)
Publisher : Unknown
Release Date : 1989-02
Category : Civil engineering
Total pages :129
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Surfactant Drag Reduction Using Mixed Counterions

Surfactant Drag Reduction Using Mixed Counterions
Author : Diana Snelling
Publisher : Unknown
Release Date : 2006
Category :
Total pages :129
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Abstract: This study focused on using mixtures of counterions to improve the performance of a cationic surfactant over single counterions. The concentration of surfactant and total counterion concentration remained constant while the ratio of each counterion was varied. The cationic surfactant cetyltrimethylammonium chloride (CTAC) was tested with counterions sodium ethylbenzenesulfonate (NaEbs), sodium 3-hydroxy-2-naphthoate (SHN), and sodium salicylate (NaSal). Organic counterions stabilize threadlike micelles in surfactant solutions and enable turbulent drag reduction. Cryo-TEM imaging was used to visualize the nanostructures of our complex fluids. Counterion mixtures were tested in both water and ethylene glycol/water solutions. Certain ratios of counterions resulted in increased maximum drag reduction and effective temperature range compared with either counterion at the same total counterion concentration. The aqueous system of 75% NaSal and 25% SHN gave effective drag reduction over the entire temperature range of our testing system (2-95°C). This surfactant system is a candidate for use in conventional aqueous district cooling and in aqueous district heating systems. Surfactant solutions with mixed counterions in 20% ethylene glycol/water showed the same pattern of behavior as in water but with less effective drag reduction. Lower effective upper temperatures and lower maximum drag reductions were found in the 20% EG/water solvent.

Transactions of the Society of Petroleum Engineers

Transactions of the Society of Petroleum Engineers
Author : Anonim
Publisher : Unknown
Release Date : 1981
Category : Petroleum engineering
Total pages :129
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Chemical Engineering Progress Symposium Series

Chemical Engineering Progress Symposium Series
Author : Anonim
Publisher : Unknown
Release Date : 1971
Category : Chemical engineering
Total pages :129
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Investigating the Degradation Resistance Improvement of the Polymeric Drag Reduction

Investigating the Degradation Resistance Improvement of the Polymeric Drag Reduction
Author : Esmail Abdullah Mohammed Basheer
Publisher : Unknown
Release Date : 2013
Category : Drag (Aerodynamics)
Total pages :69
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An important practical aspect in the application and study of drag reduction by polymer additives is the degradation of the polymer, for instance due to intense shearing, especially in circulatory flow systems. Such degradation leads to a marked loss of the drag-reducing capability of the polymer. Polymers-Surfactant complex efficacy in reducing the drag and improving the degradation resistance is a new subject in drag reduction research. Turbulent drag reduction (DR) efficacy of ionic Sodium Polystyrene Sulfonate (NaPSS) and sodium Alkylbenzene sulfonate, complexes systems regarding polymer-surfactant interaction was examined under a turbulent flow in a rotating disk apparatus, in which the DR efficacy indicates how the torque is being reduced with a tiny amount of additives under a turbulent flow at a fixed rotational speed. It was found that the addition of the surfactant to the ionic increased the polymer chain dimensions via a conformational structural change, thus enhancing the DR efficacy. Polymer-surfactant system also shows that there exists a critical polymer concentration at which the drag reduction becomes a maximum, and then above the critical concentration, the DR efficacy decreases more rapidly than that of pure polymeric systems. On the other hand, it was found that the addition of the surfactant to the ionic polymer enhance its ability to resist the degradation caused by the high shear stress in the eddy flow. The addition of sodium Alkylbenzene sulfonate to the ionic polymer was found to have higher improvement than the addition of DDAB in degradation resistance. The DR and degradation resistance efficacy induced by the polymer-surfactant mixture is found to be obvious higher than of pure polymer. In addition, the maximum of DR efficacy versus polymer concentration occurred at 700 ppm.

Encyclopedia of Fluid Mechanics

Encyclopedia of Fluid Mechanics
Author : Nicholas P. Cheremisinoff
Publisher : Butterworth-Heinemann
Release Date : 1990
Category : Science
Total pages :755
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Transactions of the American Society of Civil Engineers

Transactions of the American Society of Civil Engineers
Author : American Society of Civil Engineers
Publisher : Unknown
Release Date : 1971
Category : Civil engineering
Total pages :129
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Vols. 29-30 contain papers of the International Engineering Congress, Chicago, 1893; v. 54, pts. A-F, papers of the International Engineering Congress, St. Louis, 1904.

Petroleum Abstracts

Petroleum Abstracts
Author : Anonim
Publisher : Unknown
Release Date : 1993
Category : Petroleum
Total pages :129
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Professional Development Lectures

Professional Development Lectures
Author : John L. Gainer,Kanawha Valley Graduate Center
Publisher : Unknown
Release Date : 1968
Category : Chemical engineering
Total pages :44
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EPA Publications Bibliography

EPA Publications Bibliography
Author : Anonim
Publisher : Unknown
Release Date : 1987
Category : Environmental protection
Total pages :129
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SPE Production Engineering

SPE Production Engineering
Author : Anonim
Publisher : Unknown
Release Date : 1986
Category : Oil fields
Total pages :129
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Government Reports Annual Index: Keyword A-L

Government Reports Annual Index: Keyword A-L
Author : Anonim
Publisher : Unknown
Release Date : 1985
Category : Government reports announcements & index
Total pages :129
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Fluid Flow Handbook

Fluid Flow Handbook
Author : Saleh Jamal,Jamal Saleh
Publisher : McGraw Hill Professional
Release Date : 2002-03-26
Category : Science
Total pages :1000
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Helps in analyzing and designing fluid flow and piping systems projects. This work, blending theoretical review and engineering practicality, provides a treatment of pumps, pipes and piping systems, hydraulics, and hydrology. With illustrations, this handbook offers a discussion on issues critical to civil engineers.