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Author : Robert William Paterson
Publisher :
ISBN 13 :
Total Pages : pages
Book Rating : 4.:/5 (769 download)
Download or read book Turbulent Flow Drag Reduction with Dilute Polymer Solutions written by Robert William Paterson and published by . This book was released on 1969 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Ralph C. Little
Publisher :
ISBN 13 :
Total Pages : 25 pages
Book Rating : 4.:/5 (227 download)
Download or read book Drag Reduction by Dilute Polymer Solutions in Turbulent Flow written by Ralph C. Little and published by . This book was released on 1967 with total page 25 pages. Available in PDF, EPUB and Kindle. Book excerpt: The mechanism by which water-soluble polymers reduce hydrodynamic drag on solid surfaces was investigated by measurements of flow birefringence and of turbulent flow in pipes. Flow birefringence and flow field orientation of Polyox polymers in the molecular weight range from 200,000 to 6,000,000 showed that Polyox macromolecules continue to deform with increasing velocity gradient even after alignment with the flow field (at gradients in excess of 2000/sec). All solutions used were found to be Newtonian, with the exception of the AcrysolA-5 solutions. The flow data for Polyox solutions in a Pyrex pipe were examined in terms of Meyer's fluid property parameter and Elata's relaxation time hypothesis for the initiation of drag reduction. It was found that drag reduction in the Pyrex pipe was initiated at a value of the order of one-fifth that predicted by Elata's theory. Moreover, added salt (the solution being 0.3 molar in K2SO4) had no effect on the flow of Polyox Coagulant solutions even though the intrinsic viscosity (upon which Rouse relaxation times depend) was cut to slightly more than one-third of its value in the pure solvent. The unusually high values of Meyer's fluid property parameter observed at low concentrations suggests that adsorption on the Pyrex pipe walls may be playing a role in drag reduction. (Author).
Author : Robert W. Paterson
Publisher :
ISBN 13 :
Total Pages : 197 pages
Book Rating : 4.:/5 (227 download)
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).
Author : A. Gyr
Publisher : Springer Science & Business Media
ISBN 13 : 9401712956
Total Pages : 243 pages
Book Rating : 4.4/5 (17 download)
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.
Author : James Henry Hand
Publisher :
ISBN 13 :
Total Pages : 680 pages
Book Rating : 4.:/5 (28 download)
Download or read book Drag Reduction in Flow of Dilute Polymer Solutions written by James Henry Hand and published by . This book was released on 1971 with total page 680 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Hyunkook Shin
Publisher :
ISBN 13 :
Total Pages : 590 pages
Book Rating : 4.:/5 (142 download)
Download or read book Reduction of Drag in Turbulence by Dilute Polymer Solutions written by Hyunkook Shin and published by . This book was released on 1965 with total page 590 pages. Available in PDF, EPUB and Kindle. Book excerpt: The object of this thesis was to investigate the drag reduction phenomenon in turbulent flow caused by random coiling macromolecules in 'dilute' solution. In particular, this thesis was concerned with the relationship of drag (or its reduction) to the size of the coils and their concentration, of two kinds of polymers differing significantly in chain flexibility: polyethylene oxide (PEO), the more flexible, and polyisobutylene (PIB), the less flexible. It was found that, within any given homologous polymer series, the ability of macromolecules to reduce drag improved drastically with increasing molecular weight. That is, the concentration of polymers in solution either in the absolute weight fraction or in the effective volume fraction required to yield a given percent drag reduction decreased rapidly with increasing molecular weight. It was further found that there always existed an optimum concentration for any given polymer system at which the observed drag reduction reached a maximum.
Download or read book Drag Reduction and Mechnical Degradation of Dilute Polymer Solutions in High Shear Turbulent Flow written by and published by . This book was released on 1973 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : C. Sinclair Wells
Publisher : Springer
ISBN 13 : 1489955798
Total Pages : 497 pages
Book Rating : 4.4/5 (899 download)
Download or read book Viscous Drag Reduction written by C. Sinclair Wells and published by Springer. This book was released on 2013-12-20 with total page 497 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : T. T. Huang
Publisher :
ISBN 13 :
Total Pages : 35 pages
Book Rating : 4.:/5 (126 download)
Download or read book Similarity Laws for Turbulent Flow of Dilute Solutions of Drag-reducing Polymers written by T. T. Huang and published by . This book was released on 1973 with total page 35 pages. Available in PDF, EPUB and Kindle. Book excerpt: Velocity similarity laws, based on a four-layer, mean-velocity-profile model are deduced for turbulent boundary layers with dilute polymer solutions by means of pipe-flow experiments. Measured drag reduction is studied in three domains: undersaturated, optimal, and oversaturated. Drag reduction increases with increasing concentration in the undersaturated domain where the four-layer profile exists in the boundary layer. The boundary between the two domains gives optimal drag reduction; it is determined by the polymer type and concentration and by a Reynolds number based on shear velocity and boundary-layer thickness. The effects of solvent temperature, pipe diameter, polymer type and concentration, and wall shear stress on the measured drag reduction have been investigated. (Modified author abstract).
Author : Hsun-fu David Chang
Publisher :
ISBN 13 :
Total Pages : 224 pages
Book Rating : 4.:/5 (353 download)
Download or read book Correlation of Turbulent Drag Reduction in Dilute Polymer Solutions with Rheological Properties by an Energy Dissipation Model written by Hsun-fu David Chang and published by . This book was released on 1982 with total page 224 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Paul Peyser
Publisher :
ISBN 13 :
Total Pages : 20 pages
Book Rating : 4.:/5 (227 download)
Download or read book The Drag Reduction of Dilute Polymer Solutions as a Function of Solvent Power, Viscosity, and Temperature written by Paul Peyser and published by . This book was released on 1971 with total page 20 pages. Available in PDF, EPUB and Kindle. Book excerpt: The frictional drag reduction of high-molecular-weight polyethylene oxide and polystyrene solutions under turbulent flow conditions was studied as a function of temperature, solvent power, and solvent viscosity. A rotating disk apparatus was used to make the drag reduction measurements. For aqueous polyethylene oxide solutions, at concentrations well above that needed to produce maximum drag reduction, all drag reduction data reduced to a common curve when percent drag reduction was plotted against the Reynolds number for the flow. However, for polyethylene oxide solutions below this optimum concentration the drag reduction-versus-Reynolds number curves showed decreasing drag reduction with increasing temperature. The data are explained primarily in terms of the inverse temperature solubility characteristics of polyethylene oxide in water. The percent drag reduction of polystyrene in nonaqueous liquids was found to be greater in good solvents than in poor ones. It was also found that increases in solvent viscosity and decreases in temperature increased the percent drag reduction. The results are discussed in relation to the current drag reduction theories and are shown to be in opposition to Virk's theory. It is concluded from the data that drag reduction is very likely a function of a relaxation time phenomenon involving the polymer molecules and the flow system. The results also emphasize the importance of considering solvent power, viscosity, and temperature in the design of an efficient drag reduction system. (Author).
Author : Nicholas D. Sylvester
Publisher :
ISBN 13 :
Total Pages : 67 pages
Book Rating : 4.:/5 (227 download)
Download or read book Drag Reduction Degradation of Dilute Polymer Solutions in Turbulent Tube Flow written by Nicholas D. Sylvester and published by . This book was released on 1971 with total page 67 pages. Available in PDF, EPUB and Kindle. Book excerpt: Drag reduction degradation characteristics of Separan AP30 are reported. A recycle tube flow experiment was used to investigate this property of drag reducing polymer solutions. Experimental pressure gradient and flow rate measurements were made as a function of time. From this data, friction factor- time plots on log-log coordinates were constructed, all of which exhibited three distinct regions which are discussed. Correlations are presented relating the process time in which maximum drag reduction exists, and the process time in which significant drag reduction exists, to the polymeric and system flow variables.
Author : American Institute of Chemical Engineers
Publisher :
ISBN 13 :
Total Pages : 116 pages
Book Rating : 4.3/5 (97 download)
Download or read book Drag Reduction written by American Institute of Chemical Engineers and published by . This book was released on 1971 with total page 116 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Ashok K. Jain
Publisher :
ISBN 13 :
Total Pages : 210 pages
Book Rating : 4.:/5 (18 download)
Download or read book Correlations of Turbulent Drag Reduction in Dilute Polymer Solutions written by Ashok K. Jain and published by . This book was released on 1971 with total page 210 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : P. E. Roper
Publisher :
ISBN 13 :
Total Pages : pages
Book Rating : 4.:/5 (534 download)
Download or read book Turbulent Drag Reduction in Dilute Polymer Solutions written by P. E. Roper and published by . This book was released on 1983 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Edward W. Merrill
Publisher :
ISBN 13 :
Total Pages : 149 pages
Book Rating : 4.:/5 (227 download)
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.
Author : Edward W. Merrill
Publisher :
ISBN 13 :
Total Pages : 294 pages
Book Rating : 4.:/5 (221 download)
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:
