Last edited by Akinodal
Thursday, July 9, 2020 | History

2 edition of Drag reduction with polymer additives found in the catalog.

Drag reduction with polymer additives

Quan Si Truong

Drag reduction with polymer additives

by Quan Si Truong

  • 3 Want to read
  • 14 Currently reading

Published by s.n.] in [Toronto .
Written in English

    Subjects:
  • Frictional resistance (Hydrodynamics),
  • Polymers and polymerization,
  • Turbulence,
  • Viscous flow

  • Edition Notes

    ContributionsToronto, Ont. University.
    The Physical Object
    Paginationxiii, 144 leaves, 82 leaves of plates :
    Number of Pages144
    ID Numbers
    Open LibraryOL19840421M

      DRAG REDUCTION USING POLYMER SOLUTIONS IN GRAVITY DRIVEN FLOW SYSTEMS: Modeling [chirravuri, subbarao] on *FREE* shipping on qualifying offers. DRAG REDUCTION USING POLYMER SOLUTIONS IN GRAVITY DRIVEN FLOW SYSTEMS: Modeling. The Peculiarities of the Structure of Wall Turbulence and the Mechanism of Drag Reduction by Polymer Additives. Pages Book Title The Influence of Polymer Additives on Velocity and Temperature Fields Book Subtitle Symposium Universität — GH — Essen, Germany, June 26–28,

    Turbulent drag reduction by additives has long been a hot research topic. This phenomenon is inherently associated with multifold expertise. Solutions of drag-reducing additives are usually viscoelastic fluids having complicated rheological properties. Exploring the characteristics of drag-reduced turbulent flows calls for uniquely designed experimental and numerical simulation techniques . Drag reduction is the increase in pumpability of a fluid caused by the small amount of additives. Practically, adding a small concentration of the drag reducing polymers (DRPs) to the carrier fluid reduces the friction of the fluid and increases the capacity of pipeline without changing the pipelines flow conditions [].This phenomenon of the DRPs has been applied in the transportation of crude.

      J. den Toonder, Drag Reduction by Polymer Additives in a Turbulent Pipe Flow: Laboratory and Numerical Experiments, Ph.D. dissertation, Technische Universiteit Delft, . USA USDA USA US A US A US A US D A USD A US DA US A US A US A Authority US United States Prior art keywords vehicle gas liquid water injection Prior art date Legal status (The legal status is an assumption and is not a legal conclusion.


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Drag reduction with polymer additives by Quan Si Truong Download PDF EPUB FB2

Polymer Drag Reduction. pages toin Julyhave clearly demonstrated that polymer additives can reduce drag when they are in. remarkable drag reduction is achieved.

In this section we briefly discuss the experiments and some important elementary facts about polymer sizes and relaxation rates. Some novel chemical architectures for polymer additives are discussed. Section 2 is a critique of existing ideas about polymer drag Size: 1MB.

Turbulent drag reduction by polymer additives: a survey. In The Influence of Polymer Additives on Velocity and Temperature Fields (IUTAM Symp. ), ed. Gampert, B., Springer-Verlag, pp. 3–Cited by:   Drag reduction by polymer additives in a turbulent pipe flow: numerical and laboratory experiments - Volume - J.

DEN TOONDER, M. HULSEN, G. KUIKEN Cited by: Drag reduction (DR) by polymer additives in turbulent flows was first disco vered. by T oms ini.e. the dilute addition of high-molecular-weight polymers to flowing. PDF | In this book, the flow behavior characteristics for Iraqi crude oil using different polymer additives were investigated.

Polyacrylic acid (PPA) | Find, read and cite all the research you. Influence of Polymer Additives on the Friction Drag of an Elastic Plate. Investigations on the polymer addition effect upon the friction drag of the cylinders are described in [48, ] [48] [] and in Chapter 6.

Drag reduction with polymer additives book As in other papers, drag reduction is achieved by altering the concentration and consumption of the injected polymer solution. Polymers are effective drag reducers owing to their ability to suppress the formation of turbulent eddies at low concentrations.

Existing drag reduction methods can be generally classified into additive and non-additive techniques. The polymer additive based method is categorized under additive techniques.

Other drag reducing additives are fibers and surfactants. Over the past decades numerous studies have been carried out on drag reduction by polymer additives. For a review of the early work on this subject we refer to Lumley [3] who outlines the different physical phenomena of drag reduction and to Virk [4] who presents experimental evidence that drag reduction is limited by an asymptotic value.

Flexible and rigid long chain polymers in very dilute solutions can significantly reduce the drag in turbulent flows.

The polymers successively stretch and coil by interacting with the turbulent structures, which changes the turbulent flow and further imposes a transient behavior on the drag reduction (DR) as well as a subsequent mechanical polymer degradation. This peer-reviewed paper is a review of studies on the use of polymer additives and surfactants as drag reduction agents.

The topic of the review is important and its content is useful. However, the paper needs to be improved before it can be accepted for publication. It seems that the authors use the original figures of the cited publications. Research output: Book/Report › Other report. Overview; Polymer additive in the water has just the opposite effect on a rough-surfaced body, decreasing the amplitude at the peak and at all lower frequencies, the reduction increasing monotonically with drag reduction.

There was little or no effect at high frequencies attributable to either. Perlekar P, Mitra D, Pandit R. Manifestations of drag reduction by polymer additives in decaying, homogeneous, isotropic turbulence. Physical review letters.

Jin S Numerical simulations of a dilute polymer solution in isotropic turbulence PhD Thesis Cornell University, Ithaca, NY. REIF () and HOYT and SELLIN () observed the flow modifications in the roller of hydraulic jumps with drag reducing additives (table ).

With polymer additives, REIF’s results indicated an increase of mean velocity near the bottom, an increase of longitudinal turbulent velocity fluctuations in the roller and a reduction of energy losses.

Mechanical degradation of DRP is defined as the loss of effectiveness in polymer drag-reducing ability that is not regained once mechanical stress is removed.

29 In our study, PEO degradation was evaluated via reduction in drag-reducing efficiency and polymer solution viscosity. Four experiments were performed (two for each pump), and small. The onset of drag reduction by dilute polymer additives, and the maximum drag reduction asymptote - Volume - KATEPALLI R.

SREENIVASAN, CHRISTOPHER M. WHITE. Book Search tips Selecting this option will search all publications across the Scitation platform Selecting this option will search all publications for the Publisher/Society in context. “ Drag reduction by polymer additives in a turbulent channel flow,” J.

Fluid Mech. Abstract. A polymeric drag reducer has been tested in an 8-in. diameter crude oil pipeline. The test segment was 28 miles long. At the normal flow velocity in the 8-in. line of about 6 ft/sec, drag reductions of 16, 21 and 25 percent were obtained at polymer concentrations ofand 1, volume ppm.

The topics covered are laminar boundary layers, turbulent flows, nonplanar geometries, blowing and suction, polymer additives, and compliant surfaces. A brief overview of each area is provided by a recognized authority to highlight both relevant prior work and the importance of the paper to the drag reduction.

Drag Reduction of Complex Mixtures discusses the concept of drag reduction phenomena in complex mixtures in internal and external flows that are shown experimentally by dividing flow patterns into three book is intended to support further experiments or analysis in drag reduction.

As accurately modeling flow behavior with drag reduction is always complex, and since drag reducing. of drag reduction. 1. Introduction Since Toms () reported turbulent drag reduction by polymer additives, there have been many studies on this phenomenon, including theoretical, experimental and numerical approaches.

The two most important findings from experimental studies by Virk et al. () and Virk () are the onset of drag.Drag Reduction of Turbulent Flows by Additives is the first treatment of the subject in book form. The treatment is extremely broad, ranging from physicochemical to hydromechanical aspects.

The book shows how fibres, polymer molecules or surfactants at very dilute concentrations can reduce the drag of turbulent flow, leading to energy savings.On investigating turbulent reactive flows: case studies of combustion and drag reduction by polymer additives,” ongoing Ph.D.

thesis, Tampere University of Technology, Tampere, Finland. This content is only available via PDF.