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Turbulent Flow Drag Reduction By Dilute Polyethylene Oxide Solutions In Capillary Tubes
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Book Synopsis Turbulent Flow Drag-reduction by Dilute Poly(ethylene Oxide) Solutions in Capillary Tubes by : Ira Michael Felsen
Download or read book Turbulent Flow Drag-reduction by Dilute Poly(ethylene Oxide) Solutions in Capillary Tubes written by Ira Michael Felsen and published by . This book was released on 1972 with total page 286 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Frictional Drag Reduction and Mechanical Degradation of Dilute Polyethylene Oxide Solutions in High Shear Turbulent Flow Environments by :
Download or read book Frictional Drag Reduction and Mechanical Degradation of Dilute Polyethylene Oxide Solutions in High Shear Turbulent Flow Environments written by and published by . This book was released on 1971 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis The Drag Reduction of Dilute Polymer Solutions as a Function of Solvent Power, Viscosity, and Temperature by : Paul Peyser
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).
Book Synopsis Turbulent Drag Reduction and Mechnical Degradation of Dilute Polyethylene Oxide Solutions by :
Download or read book Turbulent Drag Reduction and Mechnical Degradation of Dilute Polyethylene Oxide Solutions written by and published by . This book was released on 1971 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Drag Reduction by : American Institute of Chemical Engineers
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:
Book Synopsis Scientific and Technical Aerospace Reports by :
Download or read book Scientific and Technical Aerospace Reports written by and published by . This book was released on 1971 with total page 300 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis A Study of Drag Reduction in Turbulent Flow in Tubes and Parallel Plates by : David Bradley Clark
Download or read book A Study of Drag Reduction in Turbulent Flow in Tubes and Parallel Plates written by David Bradley Clark and published by . This book was released on 1974 with total page 190 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Drag Reduction in Flow of Dilute Polymer Solutions by : James Henry Hand
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:
Book Synopsis Turbulent Flow Drag Reduction with Dilute Polymer Solutions by : Robert William Paterson
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:
Book Synopsis Chemical Additives for Improvement of Oil Spill Control, August 1974 by : United States. Coast Guard
Download or read book Chemical Additives for Improvement of Oil Spill Control, August 1974 written by United States. Coast Guard and published by . This book was released on 1974 with total page 204 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Reduction of Drag in Turbulence by Dilute Polymer Solutions by : Hyunkook Shin
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.
Book Synopsis Viscous Drag Reduction by : C. Sinclair Wells
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:
Book Synopsis The Effect of Polymer Structure on Drag Reduction in Nonpolar Solvents by : Gin Chain Liaw
Download or read book The Effect of Polymer Structure on Drag Reduction in Nonpolar Solvents written by Gin Chain Liaw and published by . This book was released on 1968 with total page 318 pages. Available in PDF, EPUB and Kindle. Book excerpt: "The effects of polymer chain flexibility, molecular weight and entanglement capacity, and of polymer solution concentration on drag reduction in nonpolar solvents were studied in this investigation. Three samples of polydimethyl siloxane in toluene, five samples of polyethylene oxide in benzene, two samples of cis-polyisoprene in toluene, trans-polyisoprene in toluene, cis-polybutadiene in toluene, ethyl cellulose in toluene and a copolymer of epichlorohydrin and polyethylene oxide in toluene were studied. Molecular weights of all polymers were estimated from intrinsic viscosity, except for the molecular weight of the copolymer which was given by the manufacturer. Turbulent and laminar flow pressure drop data were obtained in four capillary tubes (0.107, 0.0642, 0.0328 and 0.0104 inch ID) for all the polymer-solvent systems. Turbulent flow pressure drop data for some of the above polymer-solvent systems were also obtained in the pipe flow unit (2.0, 1.0 and 0.51 inch ID). For a given tube, at lower concentrations the normal transition region appeared between laminar and turbulent regions; as the concentration increased, the transition tended to disappear. At constant solution concentration, the transition region tended to disappear as the tube diameter decreased ... Correlations were obtained for estimating the amount of drag reduction for "dilute" and "concentration" solutions. Both correlations were tested with the polymer-solvent systems studied in this investigation and with data obtained from literature ... The effect of degradation on drag reduction was more noticeable at lower concentrations than at higher concentrations. This suggests that the absolute rate of molecular degradation may have been approximately the same for all concentrations of any polymer whose wall shear stresses (or shear rates) were of the same magnitude at any given flow rate. In the dilute solutions a significant number of the effective molecules were degraded while in the more concentrated solutions, the same amount of degradation had a much smaller effect on the drag reducing capacity of the solutions"--Abstract, leaves i-iii.
Book Synopsis Drag Reduction by : Herbert Simon Stephens
Download or read book Drag Reduction written by Herbert Simon Stephens and published by Bhra Fluid Engineering. This book was released on 1977 with total page 378 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Drag Reduction and Degradation of Dilute Polymer Solutions in Turbulent Pipe Flows by : T. T. Huang
Download or read book Drag Reduction and Degradation of Dilute Polymer Solutions in Turbulent Pipe Flows written by T. T. Huang and published by . This book was released on 1971 with total page 36 pages. Available in PDF, EPUB and Kindle. Book excerpt: Drag reduction caused by dilute polyethylene oxide (POLYOX WSR-301) and anionic charged polyacrylimide (MAGNIFLOC 835A) polymer solutions was studied experimentally in 1.918- and 0.455-cm ID smooth pipes. The POLYOX solutions tested are superior in drag reduction but inferior in shear-degradation resistance compared to the MAGNIFLOC solutions at corresponding concentrations. A three-layer mean velocity profile model appears to be more consistent with current and other data than a traditional two-layer model. The onset of measured drag reduction depends upon solution concentration and is seriously affected by shear degradation. (Author).
Book Synopsis Drag Reduction by Dilute Polymer Solutions in Turbulent Flow by : Ralph C. Little
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).
Book Synopsis Drag Reduction for Spheres Settling in Dilute Polyethylene-oxide Solutions by : Le Quang Trach
Download or read book Drag Reduction for Spheres Settling in Dilute Polyethylene-oxide Solutions written by Le Quang Trach and published by . This book was released on 1968 with total page 210 pages. Available in PDF, EPUB and Kindle. Book excerpt:
