Predicting The Rheological Properties Of Dilute Polymer Solutions Using Bead Spring Models

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Predicting The Rheological Properties Of Dilute Polymer Solutions Using Bead Spring Models

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Author : Prabhakar Ranganathan
language : en
Publisher:
Release Date : 2005

Predicting The Rheological Properties Of Dilute Polymer Solutions Using Bead Spring Models written by Prabhakar Ranganathan and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2005 with Brownian motion processes categories.

Study Of Rheological Properties Of Polymeric Liquids By Using Multiple Mode Models

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Author :
language : en
Publisher:
Release Date : 2005

Study Of Rheological Properties Of Polymeric Liquids By Using Multiple Mode Models written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2005 with categories.

Knowledge of the rheological properties of non-Newtonian fluids is critical for modeling in polymer-processing equipment such as injection molders, extruders, and blow molders. Rheological measurements can be obtained through standard flows, such as shear flow and elongational flow. In our research, we modeled the rheological properties of polymeric fluids in several types of experiments: transient and steady shear flow, small amplitude oscillatory shear flow, transient elongational flow, and step-strain shear flow. The accuracy of modeling calculations depends critically on the performance of the rheological model used. Differential constitutive models with a single relaxation time can be used for exploratory fluid dynamics research and provide insight into the qualitative effects of viscoelasticity in complex flow fields. However, differential models with a single relaxation time give a poor quantitative description of rheological properties, since most non-Newtonian media exhibit not just one, but a whole spectrum of relaxation times; therefore multiple relaxation modes models were used in our research. One of the coupled linear relaxation models, the Two Coupled Maxwell Modes (TCMM) Model, was used to describe quantitatively shear-thickening behavior, which can be observed under certain conditions for high molecular weight polymers dissolved in low viscosity solvents. In this case, the shear viscosity of the polymer solution increases with increasing shear rate. A full parameterization of the TCMM Model to the experimental data from the literature provided a thorough understanding of the significance of the model parameters and a clear insight into the peculiar behavior of shear thickening in dilute polymer solutions. The primary part of the research focused on models with linear springs. A typical, industrial-grade, low-density polyethylene polymer was studied using three types of multi-mode models: i) uncoupled linear relaxation models; ii) coupled linear relaxation models; iii) uncoupled non-linear relaxation models. The data from small amplitude oscillatory shear flow and steady shear flow were fitted to obtain the parameters of the different models using the Nelder and Mead Downhill Simplex method. Then the predictions for the other standard flows mentioned in the first paragraph were compared with experimental data. This allowed us to determine the degree of the performance of the different models with regards to the corresponding system studied. Overall evaluations of model performance were presented in detail. Finally, we tested the effects of spring type on the performance of the models described above. We replaced the linear elastic springs in all of the prior models with nonlinear springs to determine whether this would improve model performance in elongational flow. The Finitely-Extensible Nonlinear Elastic Spring Model was used to describe the nonlinear elastic springs. The result was negative, however: no improvement was obtained over the linear spring models and more parameters were present which required further fitting to experimental data.

Rheological Properties Of Dilute Polymer Solutions Determined In Extensional And In Shearing Experiments

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Author : K. M. Baid
language : en
Publisher:
Release Date : 1977

Rheological Properties Of Dilute Polymer Solutions Determined In Extensional And In Shearing Experiments written by K. M. Baid and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1977 with Polymerization categories.

Theoretical And Applied Rheology

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Author : P. Moldenaers
language : en
Publisher: Elsevier
Release Date : 2013-10-22

Theoretical And Applied Rheology written by P. Moldenaers and has been published by Elsevier this book supported file pdf, txt, epub, kindle and other format this book has been release on 2013-10-22 with Technology & Engineering categories.

More than 900 authors from over 35 countries contributed to the 1992 International Congress on Rheology. These proceedings volumes comprise 17 plenary and keynote papers, 250 oral contributions and some 200 poster presentations. All relevant aspects of rheology are covered, e.g., theoretical rheology, molecular theories, fluid mechanics, rheometry, experimental methods, foams, polymer solutions, polymer melts, rubber, solids, composites, biorheology, industrial rheology, polymer processing, food rheology and electrorheology, reflecting the development of rheology into a broad, multidisciplinary field of recognized academic and industrial relevance.

Brownian Dynamics Simulations Of Dilute Polymer Solutions With Complex Hydrodynamics

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Author : Chih-Chen Hsieh
language : en
Publisher:
Release Date : 2005

Brownian Dynamics Simulations Of Dilute Polymer Solutions With Complex Hydrodynamics written by Chih-Chen Hsieh and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2005 with categories.

Correlations Of Rheological Properties And Anti Misting Performances For Dilute Polymer Solutions

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Author : Keith Ko-kung Chao
language : en
Publisher:
Release Date : 1981

Correlations Of Rheological Properties And Anti Misting Performances For Dilute Polymer Solutions written by Keith Ko-kung Chao and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1981 with categories.

Constitutive Equations Dervied From Molecular Models For Polymer Solutions

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Author : Yeen-jing Wu
language : en
Publisher:
Release Date : 1970

Constitutive Equations Dervied From Molecular Models For Polymer Solutions written by Yeen-jing Wu and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1970 with Fluid mechanics categories.

Journal Of Rheology

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Author :
language : en
Publisher:
Release Date : 2008

Journal Of Rheology written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2008 with Rheology categories.

Includes abstracts from the Journal of the Society of Rheology, Japan.

Papers Presented At The Meeting

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Author : American Chemical Society. Division of Polymer Chemistry
language : en
Publisher:
Release Date : 1990

Papers Presented At The Meeting written by American Chemical Society. Division of Polymer Chemistry and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1990 with Chemistry categories.

Determination Of Nonlinear Viscoelastic Properties Of Dilute Drag Reducing Polymer Solutions By A Transient Response Method

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Author : Chen Fai Tsai
language : en
Publisher:
Release Date : 1976

Determination Of Nonlinear Viscoelastic Properties Of Dilute Drag Reducing Polymer Solutions By A Transient Response Method written by Chen Fai Tsai and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1976 with Polymerization categories.