Studies on the Turbulent Flow and Viscoelastic Properties of Dilute Non-Newtonian Polymer Solutions PDF Download

Author: Donald Mervyn Meter
Publisher:
ISBN:
Category : Polymerization
Languages : en
Pages : 740

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Author: Chien-Bang Wang
Publisher:
ISBN:
Category : Fluid dynamics
Languages : en
Pages : 810

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Author: Michael Poreh
Publisher:
ISBN:
Category : Plasticity
Languages : en
Pages : 238

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Book Description
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:
Publisher:
ISBN:
Category : Mechanics, Applied
Languages : en
Pages : 628

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Author: Cocconi, Giacomo
Publisher: KIT Scientific Publishing
ISBN: 373150829X
Category : Science
Languages : en
Pages : 136

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Author: Purushottam D. Gujrati
Publisher: John Wiley & Sons
ISBN: 9783527630264
Category : Technology & Engineering
Languages : en
Pages : 564

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Book Description
Filling a gap in the literature and all set to become the standard in this field, this monograph begins with a look at computational viscoelastic fluid mechanics and studies of turbulent flows of dilute polymer solutions. It then goes on discuss simulations of nanocomposites, polymerization kinetics, computational approaches for polymers and modeling polyelectrolytes. Further sections deal with tire optimization, irreversible phenomena in polymers, the hydrodynamics of artificial and bacterial flagella as well as modeling and simulation in liquid crystals. The result is invaluable reading for polymer and theoretical chemists, chemists in industry, materials scientists and plastics technologists.

Author: Donald Chapman Bogue
Publisher:
ISBN:
Category : Chemical engineering
Languages : en
Pages : 116

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The first chapter serves as an introduction which covers the historical perspective and classifies the phenomena. The three following chapters then deal with fundamentals of rheology: rheological properties of fluids; and engineering analysis. (Author).

Author: Stefano Berti
Publisher:
ISBN:
Category :
Languages : en
Pages : 103

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This thesis presents a theoretical and numerical study of turbulence in non-Newtonian fluids. The dynamics of these systems can be modelled in terms of transported active fields and constitutes a subject of general interest in complex fluid's physics. Their peculiar rheological properties make them attractive also for engineering applications. The major part of the work concerns turbulence in dilute polymer solutions, i. e. viscoelastic fluids. Two issues are considered : the small-scale statistics at moderate values of elasticity in a fully developed turbulence regime ; the destabilization of a laminar flow by means of purely elastic non linearities. The effect of polymers on small-scale turbulence has been studied in a simplified viscoelastic fluid model, in a homogeneous isotropic configuration. The modifications on the turbulent cascade have been addressed, as well as their consequences on small-scale statistics. In the opposite limit of negligible inertial non linearities, polymeric degrees of freedom can destabilize a flow, when the elasticity of the solution is large enough. At growing elasticity, a transition to chaotic, and turbulent, states is observed. The experimental phenomenology has been numerically reproduced and statistical properties have been characterized. Another item considered is that of binary mixtures. Phase separation between two fluids has been investigated in presence of an externally forced velocity field. The competition between thermodynamic forces and local shears has been examined in both active and passive mixtures and the marginal role of Lagrangian chaos in the phenomenon of coarsening arrest has been highlighted.

Author: M. T. Goodall
Publisher:
ISBN:
Category :
Languages : en
Pages :

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Author: Gerhard de Wind
Publisher:
ISBN:
Category : Polymerization
Languages : en
Pages : 74

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