Drag Reduction And Shear Degradation Of Dilute Polymer Solutions As Measured By A Rotating Disk
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Drag Reduction And Shear Degradation Of Dilute Polymer Solutions As Measured By A Rotating Disk
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Author : T. T. Huang
language : en
Publisher:
Release Date : 1972
Drag Reduction And Shear Degradation Of Dilute Polymer Solutions As Measured By A Rotating Disk 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 1972 with Drag (Aerodynamics) categories.
A saturated drag-reduction line for dilute polymer solutions is derived for a rotating disk from new velocity-similarity laws. Drag reduction measured by a rotating disk is found to have three domains--oversaturated, optimal and undersaturated. At a given boundary-layer thickness and wall-shear stress, the drag-reduction increases with increasing concentration in the undersaturated domain, and the drag reduction does not increase with increasing concentration in the oversaturated domain. The boundary between the two domains is the optimal drag reduction, which is determined by the type of polymer and its concentration and a Reynolds number based on shear velocity and disk radius or boundary-layer thickness. (Author).
Drag Reduction And Shear Degradation Of Diluthe Polymer Solutions As Measured By A Roating Disk
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Author : Thomas T. Huang
language : en
Publisher:
Release Date : 1972
Drag Reduction And Shear Degradation Of Diluthe Polymer Solutions As Measured By A Roating Disk written by Thomas T. Huang and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1972 with categories.
Nbs Special Publication
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Author :
language : en
Publisher:
Release Date : 1978
Nbs Special Publication written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1978 with Weights and measures categories.
Scientific And Technical Aerospace Reports
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Author :
language : en
Publisher:
Release Date : 1973
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 1973 with Aeronautics categories.
The Drag Reduction Of Dilute Polymer Solutions As A Function Of Solvent Power Viscosity And Temperature
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Author : Paul Peyser
language : en
Publisher:
Release Date : 1971
The Drag Reduction Of Dilute Polymer Solutions As A Function Of Solvent Power Viscosity And Temperature written by Paul Peyser 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.
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).
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.
Hydraulic Research In The United States And Canada
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Author : United States. National Bureau of Standards
language : en
Publisher:
Release Date : 1978
Hydraulic Research In The United States And Canada written by United States. National Bureau of Standards and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1978 with Hydraulic engineering categories.
Drag Reduction Of Degraded And Blended Polymer Solutions
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Author : Thomas T. Huang
language : en
Publisher:
Release Date : 1975
Drag Reduction Of Degraded And Blended Polymer Solutions written by Thomas T. Huang and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1975 with Fluid mechanics categories.
A 3.18-cm-ID smooth turbulent flow pipe facility was utilized to measure the drag-reduction characteristics of three polymer solutions: Polyox WSR-301, Separan 237, and Magnifloc 835A. A rotating disk was used to degrade the polymer solutions, and accurate control was maintained over the energy used to agitate (shear degrade) them. Quantitative data were obtained on the relationship between degradation and drag reduction for these three polymers and for blended solutions prepared by mixing two different polymers in various proportions.
Drag Reduction And Degradation Of Dilute Polymer Solutions In Turbulent Pipe Flows
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Author : T. T. Huang
language : en
Publisher:
Release Date : 1971
Drag Reduction And Degradation Of Dilute Polymer Solutions In Turbulent Pipe Flows 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 1971 with Drag (Aerodynamics) categories.
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).
Hydraulic Research In The United States And Canada 1976
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Author : Pauline H. Gurewitz
language : en
Publisher:
Release Date : 1978
Hydraulic Research In The United States And Canada 1976 written by Pauline H. Gurewitz and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1978 with Hydraulic engineering categories.