Download or read book Extensional Flow Behavior of Turbulent Drag Reducing Polymer Solutions written by Jay Anderson Shands and published by . This book was released on 1985 with total page 832 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Turbulent Drag Reduction by Surfactant Additives written by Feng-Chen Li and published by John Wiley & Sons. This book was released on 2012-01-10 with total page 233 pages. Available in PDF, EPUB and Kindle. Book excerpt: Turbulent drag reduction by additives has long been a hot research topic. This phenomenon is inherently associated with multifold expertise. Solutions of drag-reducing additives are usually viscoelastic fluids having complicated rheological properties. Exploring the characteristics of drag-reduced turbulent flows calls for uniquely designed experimental and numerical simulation techniques and elaborate theoretical considerations. Pertinently understanding the turbulent drag reduction mechanism necessities mastering the fundamentals of turbulence and establishing a proper relationship between turbulence and the rheological properties induced by additives. Promoting the applications of the drag reduction phenomenon requires the knowledge from different fields such as chemical engineering, mechanical engineering, municipal engineering, and so on. This book gives a thorough elucidation of the turbulence characteristics and rheological behaviors, theories, special techniques and application issues for drag-reducing flows by surfactant additives based on the state-of-the-art of scientific research results through the latest experimental studies, numerical simulations and theoretical analyses. Covers turbulent drag reduction, heat transfer reduction, complex rheology and the real-world applications of drag reduction Introduces advanced testing techniques, such as PIV, LDA, and their applications in current experiments, illustrated with multiple diagrams and equations Real-world examples of the topic’s increasingly important industrial applications enable readers to implement cost- and energy-saving measures Explains the tools before presenting the research results, to give readers coverage of the subject from both theoretical and experimental viewpoints Consolidates interdisciplinary information on turbulent drag reduction by additives Turbulent Drag Reduction by Surfactant Additives is geared for researchers, graduate students, and engineers in the fields of Fluid Mechanics, Mechanical Engineering, Turbulence, Chemical Engineering, Municipal Engineering. Researchers and practitioners involved in the fields of Flow Control, Chemistry, Computational Fluid Dynamics, Experimental Fluid Dynamics, and Rheology will also find this book to be a much-needed reference on the topic.

Download or read book Drag Reduction of Turbulent Flows by Additives written by A. Gyr and published by Springer Science & Business Media. This book was released on 2013-03-09 with total page 243 pages. Available in PDF, EPUB and Kindle. Book excerpt: Drag Reduction of Turbulent Flows by Additives is the first treatment of the subject in book form. The treatment is extremely broad, ranging from physicochemical to hydromechanical aspects. The book shows how fibres, polymer molecules or surfactants at very dilute concentrations can reduce the drag of turbulent flow, leading to energy savings. The dilute solutions are considered in terms of the physical chemistry and rheology, and the properties of turbulent flows are presented in sufficient detail to explain the various interaction mechanisms. Audience: Those active in fundamental research on turbulence and those seeking to apply the effects described. Fluid mechanical engineers, rheologists, those interested in energy saving methods, or in any other application in which the flow rate in turbulent flow should be increased.

Download or read book Drag Reduction in Turbulent Flow of Polymer Solutions written by Edward W. Merrill and published by . This book was released on 1975 with total page 149 pages. Available in PDF, EPUB and Kindle. Book excerpt: Polyelectrolytes as drag reducing agents were studied; abnormal effects occurred only in dilute aqueous solutions free of added electrolyte. Extensional flows of polyisobutylene observed by light scattering indicate greater elongation than in shear flow, but work is unfinished. Onset of drag reduction studied with 'monodisperse' poly cis isoprene solutions indicate time based hypothesis gives better correlation than length based hypothesis and that there may be two different onset levels.

Download or read book The Behavior of Polymer Solutions in Extensional Flow Developed by Drop Elongation written by Thomas Anthony Wahlheim and published by . This book was released on 1982 with total page 238 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Drag Reduction in Fluid Flows written by Robert H. J. Sellin and published by . This book was released on 1989 with total page 360 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Turbulent Drag Reduction Using Rigid Microfibers written by John Steven Paschkewitz and published by . This book was released on 2004 with total page 456 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book An Experimental Study of the Relation Between Turbulent Drag Reduction and Anomalous Flow Behaviour of Polymer Solutions written by Torgny Lagerstedt and published by . This book was released on 1979 with total page 18 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Drag Reduction in Turbulent Flow of Polymer Solutions written by Edward W. Merrill and published by . This book was released on 1975 with total page 294 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Shear Extensional Effects in Internal Flows of Dilute Polymer Solutions written by Shamsur Rahman and published by . This book was released on 2011 with total page 266 pages. Available in PDF, EPUB and Kindle. Book excerpt: Shear and extensional flows of dilute polymer solutions were studied experimentally in an attempt to understand the mechanism of polymer-induced drag reduction. A flowcell capable of simulating the dynamics of a turbulent boundary layer, involving the motion of counter-rotating vortices, was designed and fabricated. The pressure drop across the flowcell was measured for different flow arrangements, first with a Newtonian fluid and then with drag reducing, dilute polymer solutions. The pressure drop in excess of the Newtonian baseline, after accounting for viscous effects, was used as a measure of elastic effects.With the dilute polymer solutions, elastic effects were observed both in shear, extensional, as well as presheared extensional flows. These effects can be attributed to additional normal stresses generated by shearing. For extensional flows, the observed effects were independent of elongation rates, indicating that a conclusion regarding the mechanism of drag reduction cannot be made from the flowfield investigated.

Download or read book Drag Reduction in Polymer Solutions written by American Institute of Chemical Engineers and published by . This book was released on 1973 with total page 106 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Drag Reduction in Near wall Turbulent Flow written by Peter North Blossey and published by . This book was released on 1999 with total page 284 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Polymer Chain Scission in Extensional and Turbulent Flows and Implications for Friction Drag Technologies written by Siva A. Vanapalli and published by . This book was released on 2006 with total page 448 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Viscous Drag Reduction written by C. Sinclair Wells and published by . This book was released on 1969 with total page 516 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Stretching of Macromolecules in Turbulent Flows written by Yitzhak Rabin and published by . This book was released on 1985 with total page 17 pages. Available in PDF, EPUB and Kindle. Book excerpt: We have investigated the behavior of dilute polymer solutions in flows which are strong in sense that they can induce a significant deformation of the macromolecules. The rationale for this approach is that since turbulent flows are laminar on sufficiently small scales (such as the size of a polymer). The stretching of polymers by elongational flow bursts within the turbulent fluid can be studied by examining the behavior of polymers in simple (laminar) elongational flows. The stretching, in turn, is a necessary condition for the flow to be significantly affected by the addition of minute quantities of polymer; this is true regardless of the details of the mechanism leading to drag reduction (DR) and is a consequence of the observation that flow modification appears when the volume fraction of the polymers exceeds unity, i.e., when the polymers are strongly overlapping (in a dilute solution this condition is satisfied only for stretched polymers). We investigated the stretching of polymers (the so-called coil stretching transition) in elongational flows using a combination of 'physical' (scaling type) and 'chemical' (molecular level description in terms of local conformational states) techniques. This report summarizes the ones that are the most important in the context of DR, and flow modification in general. Keywords: Polymers in elongation flow; Coil stretching transition; Rotational isomerism; Energy storage.

Download or read book Drag Reduction of Complex Mixtures written by Keizo Watanabe and published by Academic Press. This book was released on 2018-06-15 with total page 224 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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

Download or read book Turbulent Flow Drag Reduction and Degradation with Dilute Polymer Solutions written by Robert W. Paterson and published by . This book was released on 1969 with total page 197 pages. Available in PDF, EPUB and Kindle. Book excerpt: The purpose of the study was to attempt to find an explanation for the phenomenon first reported by Toms in 1948 in which the addition of a few grams of a long chain polymer to a million cubic centimeters of a Newtonian solvent caused a large decrease in the turbulent pipe flow pressure drop while causing only a small increase in the laminar flow viscosity. This phenomenon, which has been observed to occur for a number of different polymers and solvents, is commonly referred to as 'drag reduction with dilute polymer solutions' or 'the Toms phenomenon'. (Author).