Pipe Flow Of Dilute Polymer Solutions
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The Toms Phenomenon
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Author : Preetinder Singh Virk
language : en
Publisher:
Release Date : 1966
The Toms Phenomenon written by Preetinder Singh Virk and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1966 with Pipe categories.
Drag reduction caused by dilute, distilled water solutions of five polyethylene oxides, molecular weights from 80,000 to 6,000,000, in turbulent pipe flow was studied experimentally in 0.292 cm and 3.21 cm ID pipes. It was found that: The onset of drag reduction occurs at a well-defined wall shear stress related to the random coiling effective diameter of the polymer by the Onset Hypothesis. Laminar to turbulent transition is not, in general, delayed. The extent of drag reduction induced by a homologous series of polymers in a given pipe is a universal function of concentration, uniquely related to flow rate and molecular weight. The maximum drag reduction possible is limited by a universal asymptote that is independent of polymer and pipe diameter. In polymer solution, both the stagnation pressure attained with Pitot tubes and the heat transfer from cylinders in cross flow are drastically different from Newtonian; in general, both are lower. (Author).
Pipe Flow Of Dilute Polymer Solutions
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Author : Chien-Bang Wang
language : en
Publisher:
Release Date : 1969
Pipe Flow Of Dilute Polymer Solutions written by Chien-Bang Wang and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1969 with Fluid dynamics categories.
Pipe Flow Of Dilute Polymer Solutions
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Author : Chien-Bang Wang
language : en
Publisher:
Release Date : 1988
Pipe Flow Of Dilute Polymer Solutions written by Chien-Bang Wang and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1988 with categories.
Flow Of Dilute Polymer Solutions In Rough Pipes
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Author : Michael Poreh
language : en
Publisher:
Release Date : 1970
Flow Of Dilute Polymer Solutions In Rough Pipes written by Michael Poreh and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1970 with Pipe categories.
A simplified model is developed to describe the effects of boundary roughness on drag reduction achieved by polymer additives. The model is suitable for both uniform and nonuniform roughness. Predictions of friction coefficients by means of the model are in reasonable agreement with experimental results. (Author).
On The Secondary Flow Of Dilute Polymer Solutions In A Curved Pipe
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Author : Hin Youn Tsang
language : en
Publisher:
Release Date : 1979
On The Secondary Flow Of Dilute Polymer Solutions In A Curved Pipe written by Hin Youn Tsang and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1979 with categories.
Mass Transfer To Dilute Polymer Solutions In Turbulent Pipe Flow
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Author : Harold William Kamins
language : en
Publisher:
Release Date : 1978
Mass Transfer To Dilute Polymer Solutions In Turbulent Pipe Flow written by Harold William Kamins and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1978 with categories.
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.
Flow Of Dilute Polymer Solutions About Circular Cylinders
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Author : Turgut Sarpkaya
language : en
Publisher:
Release Date : 1971
Flow Of Dilute Polymer Solutions About Circular Cylinders written by Turgut Sarpkaya and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1971 with Fluid dynamics categories.
Flow of aqueous solutions of Polyox WSR-301, with concentrations of 1.0 to 200 wppm, past circular cylinders was investigated in the drag-transition region of Reynolds numbers. Drag force, pressure distribution, and separation angle were measured on cylinders with diameters from 1/4 to 1-1/2 inch. Lift and drag forces acting on a NACA-0024 hydrofoil-model were also measured. The polymer additive was found to alter only those force coefficients which have a Reynolds-number transition region. Two distinct types of cylinder drag transition were observed: (1) At high concentrations, transition from sub-critical to a transcritical flow occurred at the same free-stream velocity independent of body diameter; and (2) at low concentrations and/or molecular weights, tripping from a sub-critical to a super-critical flow occurred at a well defined flow condition which was a function of free-stream velocity, body diameter, and turbulent pipe-flow friction reduction. In all cases, transition occurred earlier than that in the pure solvent. The polymer had a de-stabilizing effect on the boundary-layer flow.
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).
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).