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Author: Eric H. Dunlop
Publisher:
ISBN:
Category :
Languages : en
Pages :
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Author: Eric H. Dunlop
Publisher:
ISBN:
Category :
Languages : en
Pages :
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Book Description
Author: Eric H. Dunlop
Publisher:
ISBN:
Category :
Languages : en
Pages : 0
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Author: Eric H. Dunlop
Publisher:
ISBN:
Category :
Languages : en
Pages : 336
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Author: A. T. Ellis
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ISBN:
Category :
Languages : en
Pages : 8
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The drag reducing properties of two dilute polymer solutions were studied using a simple turbulent pipe flow apparatus under various conditions of storage and mechanical degradation. Aqueous solutions of Polyox WSR-301 (polyethylene oxide) and Separan AP-30 (polyacrylamide) were prepared at 500 PPMW and then diluted into weak concentrations for storage and testing on a day by day basis. Data which display the friction reducing effectiveness as a function of aging and repeated shear degradation are presented for both polymers. At concentrations of 10, 25, 50 and 100 PPMW, aged samples showed the same 'peak' effectiveness as freshly prepared ones. However, the aging process reduced all the ability to resist mechanical degradation. Anomalies were found in which solutions tend to partially recover from shear degradation under certain conditions, and in other cases tend to improve their friction reducing efficiency after continuous shearing. Experimental results suggest that entanglement or aggregation of polymer molecules could be one of the important mechanisms involved in friction reduction. (Author).
Author: Richard H. Nadolink
Publisher:
ISBN:
Category :
Languages : en
Pages : 49
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Experiments reported herein were carried out to define and produce a calibrated polymer candidate which exhibited friction reduction with simultaneous specification of its macro-molecular properties. A series of polystyrene polymers were synthesized by a novel polymerization scheme and were extensively characterized by modern and classical techniques. The results of turbulent flow and shear wear experiments on these polystyrenes defined a range of molecular parameters in which excellent dilute solution performance was obtained for the first time reported. A complete analytical specification of the weight distribution function was obtained from experimental data. Intrinsic viscosity and normal stress measurements were made and interpreted. The acquisition of these uniquely characterized polysytrenes is shown to form a basis for future studies. Recommendations are made as to direction and execution of future research into polystyrene and other polymer mechanisms which are aimed at optimizing performance in naval applications. (Modified author abstract).
Author: John F. Ripken
Publisher:
ISBN:
Category :
Languages : en
Pages : 59
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The study extends existing data on the frictional drag reducing influence of long-chain polymers in dilute water solutions. Studies were conducted with both fresh and sea water in capillary tubes and pipes with a size range of 100 diameters and covering the laminar, transition, and turbulent regimes with N'(Re) up to 800,000. Fifteen types of test additives were used, including Polyhall, Polyox, Westco Guar, and fish slime. Test temperatures ranged from 40 to 85F. Dilute solutions ranging down to 10 ppm concentration exhibited remarkable friction reductions at high shear rates as a nearlaminar type of flow. Data correlation was hampered by diameter, temperature, and concentration effects not resolved by existing flow parameters based on power law theory. Shear degradation effects were evaluated. (Author).
Author: Aviel Brosh
Publisher:
ISBN:
Category :
Languages : en
Pages : 108
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Author: Richard Hughes Nadolink
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ISBN:
Category : Fluid dynamics
Languages : en
Pages : 352
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Author: Michael Poreh
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ISBN:
Category : Plasticity
Languages : en
Pages : 238
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Five studies are presented in this publication: A comparison between the behaviour of polymer solutions and flow characteristics of linear elastico-viscous fluid models. The study shows that no linear model can predict consistently all the observed non-Newtonian phenomena of polymer solutions; Turbulent flow of dilute polymer solutions through an annulus. Experimental and theoretical results are presented; Measurements of the dynamic response of flowing polymer solutions with a vibrating torsional quartz crystal are presented. The dynamic elastico-viscous response is found to be independent of the flow characteristics and shear rates; Drag reduction in developing boundary layers by injection of polymer solutions. Reduction of local friction coefficients is of the order of 65 percent, however, energy losses in the injection region decrease the total drag reduction efficiency. Effect of the injection concentration and discharge, width of slot and mean stream velocity are found; Drag reduction and degradation tests of several polymer solutions are presented. (Author).
Author:
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ISBN:
Category : Mechanics, Applied
Languages : en
Pages : 742
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