Similarity Laws For Turbulent Flow Of Dilute Solutions Of Drag Reducing Polymers
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Similarity Laws For Turbulent Flow Of Dilute Solutions Of Drag Reducing Polymers
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Author : T. T. Huang
language : en
Publisher:
Release Date : 1973
Similarity Laws For Turbulent Flow Of Dilute Solutions Of Drag Reducing Polymers written by T. T. Huang and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1973 with Boundary layer categories.
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).
The Frictional Resistance And Velocity Similarity Laws Of Drag Reducing Dilute Polymer Solutions
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Author : Paul S. Granville
language : en
Publisher:
Release Date : 1967
The Frictional Resistance And Velocity Similarity Laws Of Drag Reducing Dilute Polymer Solutions written by Paul S. Granville and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1967 with categories.
The velocity similarity laws of shear flows are developed for drag-reducing dilute polymer solutions. Relations for boundary-layer parameters and frictional resistance formulas of the logarithmic type are derived for pipe flow and for flat plates in parallel flow. (Author).
Drag Reduction In Flow Of Dilute Polymer Solutions
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Author : James Henry Hand
language : en
Publisher:
Release Date : 1971
Drag Reduction In Flow Of Dilute Polymer Solutions written by James Henry Hand and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1971 with categories.
Turbulent Flow Drag Reduction And Degradation With Dilute Polymer Solutions
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Author : Robert W. Paterson
language : en
Publisher:
Release Date : 1969
Turbulent Flow Drag Reduction And Degradation With Dilute Polymer Solutions written by Robert W. Paterson and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1969 with categories.
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).
Chemical Additives For Improvement Of Oil Spill Control August 1974
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Author : United States. Coast Guard
language : en
Publisher:
Release Date : 1974
Chemical Additives For Improvement Of Oil Spill Control August 1974 written by United States. Coast Guard and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1974 with Oil pollution of rivers, harbors, etc categories.
Turbulent Flow Drag Reduction With Dilute Polymer Solutions
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Author : Robert William Paterson
language : en
Publisher:
Release Date : 1969
Turbulent Flow Drag Reduction With Dilute Polymer Solutions written by Robert William Paterson and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1969 with categories.
Drag Reduction By Dilute Polymer Solutions In Turbulent Flow
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Author : Ralph C. Little
language : en
Publisher:
Release Date : 1967
Drag Reduction By Dilute Polymer Solutions In Turbulent Flow written by Ralph C. Little and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1967 with categories.
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).
Scientific And Technical Aerospace Reports
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Author :
language : en
Publisher:
Release Date : 1987
Scientific And Technical Aerospace Reports written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1987 with Aeronautics categories.
Reduction Of Drag In Turbulence By Dilute Polymer Solutions
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Author : Hyunkook Shin
language : en
Publisher:
Release Date : 1965
Reduction Of Drag In Turbulence By Dilute Polymer Solutions written by Hyunkook Shin and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1965 with Drag (Aerodynamics) categories.
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.
Applied Mechanics Reviews
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Author :
language : en
Publisher:
Release Date : 1974
Applied Mechanics Reviews written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1974 with Mechanics, Applied categories.