Effect of Molecular Weight and Segmental Constitution on the Drag Reduction of Water Soluble Polymers

Effect of Molecular Weight and Segmental Constitution on the Drag Reduction of Water Soluble Polymers

Author: Gail T. Pruitt

Publisher:

Published: 1965

Total Pages: 125

ISBN-13:

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Tube flow data on some 16 polymers indicate that drag reduction is a function of molecular contour length, segmental side groups, concentration, pipe diameter and Reynolds number. The maximum drag reduction actually obtained with any drag reducing polymer is approximately 80% of that which would be obtained if completely laminar flow was maintained. A relationship that correlates drag reduction, concentration and molecular dimensions is suggested for a constant Reynolds number and pipe size. It infers that a critical concentration of polymer exists, below which no drag reduction occurs. Also for some given concentrations and pipe size a critical velocity exists below which no drag reduction occurs. Rheological data for two polymer solutions are presented in terms of elastic energy. (Author).


Rheology of Drag Reducing Fluids

Rheology of Drag Reducing Fluids

Author: Aroon Shenoy

Publisher: Springer Nature

Published: 2020-03-25

Total Pages: 196

ISBN-13: 303040045X

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​This book explains theoretical derivations and presents expressions for fluid and convective turbulent flow of mildly elastic fluids in various internal and external flow situations involving different types of geometries, such as the smooth/rough circular pipes, annular ducts, curved tubes, vertical flat plates, and channels. Understanding the methodology of the analyses facilitates appreciation for the rationale used for deriving expressions of parameters relevant to the turbulent flow of mildly elastic fluids. This knowledge serves as a driving force for developing new ideas, investigating new situations, and extending theoretical analyses to other unexplored areas of the rheology of mildly elastic drag reducing fluids.The book suits a range of functions--it can be used to teach elective upper-level undergraduate or graduate courses for chemical engineers, material scientists, mechanical engineers, and polymer scientists; guide researchers unexposed to this alluring and interesting area of drag reduction; and serve as a reference to all who want to explore and expand the areas dealt with in this book.


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Author: United States. National Bureau of Standards

Publisher:

Published: 1966

Total Pages: 260

ISBN-13:

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