Drag Reduction In Turbulent Pipe Flow By Polyelectrolyte Solutions
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Drag Reduction in Turbulent Flow of Polymer Solutions
Author | : Edward W. Merrill |
Publisher | : |
Total Pages | : 294 |
Release | : 1975 |
Genre | : Fluid dynamics |
ISBN | : |
Correlation of Turbulent Drag Reduction in Dilute Polymer Solutions with Rheological Properties by an Energy Dissipation Model
Author | : Hsun-fu David Chang |
Publisher | : |
Total Pages | : 224 |
Release | : 1982 |
Genre | : Polymerization |
ISBN | : |
Polyelectrolytes in Solution - Their Conformation and Turbulent Flow Characteristics
Author | : William B. Clarke |
Publisher | : |
Total Pages | : 29 |
Release | : 1970 |
Genre | : |
ISBN | : |
A slightly ionic and a highly ionic polymer of molecular weights about 8000000 were studied in dilute solution. The molecular conformation was studied by intrinsic viscosity and light scattering to find the molecular weight and radius of gyration. The flow characteristics were studied in a 1.031 cm ID pipe. Salt was added to the solutions in order to change the conformation of the polymers. The polyelectrolytes were good drag-reducers, and behaved similarly to non-ionic polymers. In the presence of salt the slightly ionic polymer showed values of the onset and extent of drag reduction parameters which would be expected for the molecular weight and conformation. For the highly ionic polymer the extent parameter was slightly less than expected. When dissolved in distilled water both polymers followed the maximum drag reduction asymptote, with no onset point. However, at low concentrations the flow lines for the highly ionic polymer lay between the MDR asymptote and the Prandtl line. (Author).
The Toms Phenomenon
Author | : Preetinder Singh Virk |
Publisher | : |
Total Pages | : 906 |
Release | : 1966 |
Genre | : Pipe |
ISBN | : |
Drag reduction caused by dilute, distilled water solutions of five polyethylene oxides, molecular weights from 80,000 to 6,000,000, in turbulent pipe flow was studied experimentally in 0.292 cm and 3.21 cm ID pipes. It was found that: The onset of drag reduction occurs at a well-defined wall shear stress related to the random coiling effective diameter of the polymer by the Onset Hypothesis. Laminar to turbulent transition is not, in general, delayed. The extent of drag reduction induced by a homologous series of polymers in a given pipe is a universal function of concentration, uniquely related to flow rate and molecular weight. The maximum drag reduction possible is limited by a universal asymptote that is independent of polymer and pipe diameter. In polymer solution, both the stagnation pressure attained with Pitot tubes and the heat transfer from cylinders in cross flow are drastically different from Newtonian; in general, both are lower. (Author).
Pipe Flow of Dilute Polymer Solutions
Author | : Chien-Bang Wang |
Publisher | : |
Total Pages | : 810 |
Release | : 1969 |
Genre | : Fluid dynamics |
ISBN | : |
Polyelectrolytes and their Applications
Author | : A. Rembaum |
Publisher | : Springer Science & Business Media |
Total Pages | : 339 |
Release | : 2012-12-06 |
Genre | : Science |
ISBN | : 9401017832 |
Polyelectrolytes and their Applications is the second volume in the series 'Charged and Reactive Polymers'. The important areas of polyelectrolyte applications, i.e., biomedicine, water purification, petroleum recovery and drag reduction, are pre sented along with discussions of the fundamental principles of polyelectrolyte chem istry and physics. This book should be of interest to scientists such as physicians, biochemists, polymer chemists and chemical engineers involved in applications of these materials. The first part of the book is devoted to the basic properties of polyelectrolytes in general, namely to the factors influencing the chain conformation of charged polymers in solution and to their counterion selectivity. It also contains methods of synthesis and new concepts of charge stabilized polymer colloids and of polyelectrolyte ca talysis. The second part describes recent information on the properties and biological effects of already well-known natural polyelectrolytes such as heparin and DNA and recently developed polymers such as pyran and polyionenes. The effects of poly anions and polycations on normal and transformed cells as well as on acetylcholine receptors follow. This part is of particular interest to scientists involved in biological research.
Drag Reduction in Polymer Solutions
Author | : American Institute of Chemical Engineers |
Publisher | : |
Total Pages | : 106 |
Release | : 1973 |
Genre | : Technology & Engineering |
ISBN | : |