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Predicting The Rheological Properties Of Dilute Polymer Solutions Using Bead Spring Models
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Book Synopsis Predicting the Rheological Properties of Dilute Polymer Solutions Using Bead-spring Models by : Prabhakar Ranganathan
Download or read book Predicting the Rheological Properties of Dilute Polymer Solutions Using Bead-spring Models written by Prabhakar Ranganathan and published by . This book was released on 2005 with total page 670 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Brownian Dynamics Simulations of Dilute Polymer Solutions with Complex Hydrodynamics by : Chih-Chen Hsieh
Download or read book Brownian Dynamics Simulations of Dilute Polymer Solutions with Complex Hydrodynamics written by Chih-Chen Hsieh and published by . This book was released on 2005 with total page 342 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Theoretical and Applied Rheology by : P. Moldenaers
Download or read book Theoretical and Applied Rheology written by P. Moldenaers and published by Elsevier. This book was released on 2013-10-22 with total page 1110 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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.
Book Synopsis Study of Rheological Properties of Polymeric Liquids by Using Multiple-mode Models by :
Download or read book Study of Rheological Properties of Polymeric Liquids by Using Multiple-mode Models written by and published by . This book was released on 2005 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: 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.
Download or read book Journal of Rheology written by and published by . This book was released on 2008 with total page 650 pages. Available in PDF, EPUB and Kindle. Book excerpt: Includes abstracts from the Journal of the Society of Rheology, Japan.
Book Synopsis Rheological Properties of Dilute Polymer Solutions Determined in Extensional and in Shearing Experiments by : K. M. Baid
Download or read book Rheological Properties of Dilute Polymer Solutions Determined in Extensional and in Shearing Experiments written by K. M. Baid and published by . This book was released on 1977 with total page 24 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Dynamics Of Complex Fluids: Proceedings Of The Second Royal Society-unilever Indo-uk Forum In Materials Science And Engineering by : M J Adams
Download or read book Dynamics Of Complex Fluids: Proceedings Of The Second Royal Society-unilever Indo-uk Forum In Materials Science And Engineering written by M J Adams and published by World Scientific. This book was released on 1998-08-08 with total page 513 pages. Available in PDF, EPUB and Kindle. Book excerpt: This volume records the presentations and discussions at the Second Royal Society-Unilever Indo-UK Forum on 'Dynamics of Complex Fluids' which was the culmination of the six-month programme on this topic organised at the Issac Newton Institute for Mathematical Sciences, Cambridge University.The authors of this important volume present an up-to-date, wide-ranging view on developments in the analysis of complex fluid behaviour. Emphasis is placed upon the relation between small-scale structure and large-scale response: this brings together the approaches of molecular physics and continuum mechanics.Experiments, constitutive models and computer simulations are combined to yield new insights into the flow behaviour of polymer melts and solutions, colloidal and neutral particle suspensions, and pastes and soils.
Book Synopsis Constitutive Equations Dervied from Molecular Models for Polymer Solutions by : Yeen-jing Wu
Download or read book Constitutive Equations Dervied from Molecular Models for Polymer Solutions written by Yeen-jing Wu and published by . This book was released on 1970 with total page 184 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Papers Presented at the ... Meeting by : American Chemical Society. Division of Polymer Chemistry
Download or read book Papers Presented at the ... Meeting written by American Chemical Society. Division of Polymer Chemistry and published by . This book was released on 1990 with total page 756 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Rheology written by Giovanni Astarita and published by Springer Science & Business Media. This book was released on 2013-06-29 with total page 646 pages. Available in PDF, EPUB and Kindle. Book excerpt: At the VIIth International Congress on Rheology, which was held in Goteborg in 1976, Proceedings were for the first time printed in advance and distributed to all participants at the time of the Congress. Although of course we Italians would be foolish to even try to emulate our Swedish friends as far as efficiency of organization is concerned, we decided at the very beginning that, as far as the Proceedings were concerned, the VIIIth International Congress on Rheology in Naples would follow the standards of time liness set by the Swedish Society of Rheology. This book is the result we have obtained. We wish to acknowledge the cooperation of Plenum Press in producing it within the very tight time schedule available. Every four years, the International Congress on Rheology represents the focal point where all rheologists meet, and the state of the art is brought up to date for everybody interested; the Proceedings represent the written record of these milestones of scientific progress in rheology. We have tried to make use of the traditions of having invited lectures, and of leaving to the organizing committee the freedom to choose the lecturers as they see fit, in order to collect a group of invited lectures which gives as broad as possible a landscape of the state of the art in every relevant area of rheology. The seventeen invited lectures are collected in the first volume of the proceedings.
Book Synopsis Correlations of Rheological Properties and Anti-misting Performances for Dilute Polymer Solutions by : Keith Ko-kung Chao
Download or read book Correlations of Rheological Properties and Anti-misting Performances for Dilute Polymer Solutions written by Keith Ko-kung Chao and published by . This book was released on 1981 with total page 816 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Oscillatory Flow Birefringence of Dilute Polymer Solutions by : Timothy Lodge
Download or read book Oscillatory Flow Birefringence of Dilute Polymer Solutions written by Timothy Lodge and published by . This book was released on 1980 with total page 482 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Progress and Trends in Rheology II by : H. Giesekus
Download or read book Progress and Trends in Rheology II written by H. Giesekus and published by Springer Science & Business Media. This book was released on 2013-04-17 with total page 513 pages. Available in PDF, EPUB and Kindle. Book excerpt: Following an invitation from the Czechoslovakian The scientific programme consisted of 14 plenary delegates at the First Conference of European Rheo lectures as weIl as 310 short presentations, which were logists at Graz in 1982 and adecision by the European held in six parallel sessions in seven half-day sittings. members of the International Committee of Rheology The provision of a reading room containing submitted at the 1983 "Conference of Engineering Rheology" in manuscripts of talks presented at the meeting proved London, the Rheology Group of the Czechoslovak to be popular and seems a worthwhile addition to any Chemical Society (Chairman: Doz. lug. l. Sestak meeting, at least those holding parallel sessions. There CSc.) was entrusted with the organization of the Sec was also a display by nine companies of a wide variety ond Conference of European Rheologists. For an of current rheological instruments. outline of the process leading to the decision to hold The programme for accompanying persons befitted such European meetings, see the Introduction to the the historical significance of the region. The evening Proceedings of the First Conference of European programme included an opening ceremony and recep Rheologists; Rheol Acta 21:355-356 (1982). tion on Monday and an informal banquet on Thurs This Conference was held in the Prague Palace of day as weIl as a visit to the opera.
Book Synopsis Polymer Dynamics in Dilute Media by : Shikha Somani
Download or read book Polymer Dynamics in Dilute Media written by Shikha Somani and published by Stanford University. This book was released on 2011 with total page 135 pages. Available in PDF, EPUB and Kindle. Book excerpt: Polymers undergo a sharp coil to stretch conformational transition in extension dominated flows when the strain rate exceeds a critical value. Dramatic change in flow behavior is known to occur at the coil-stretch transition, making it useful for several commercial applications. Despite decades of study, this phenomenon remains surrounded with controversy as the effect of solvent properties and fluid flow elements on this transition is not fully understood. In this work, we present a study of the coil-stretch transition and related hysteresis phenomenon using stochastic computer simulations. We first investigate the effect of solvent quality on the coil-stretch transition using Brownian dynamics simulations. Unlike experiments, which are plagued with problems related to polydispersity of polymers and inaccurate control over flow profiles, simulations offer a powerful platform to systematically study the effect of solvent quality while keeping all other parameters in the system constant. The system consists of a polymer subjected to planar elongational flow in both theta solvents and good solvents. The polymer is represented by a bead-spring chain model undergoing elongational flow. Solvent-mediated effects such as fluctuating hydrodynamic interactions (HI) and excluded volume (EV) are included rigorously. Conformational hysteresis is understood in terms of a 1-D energy landscape theory with an activation energy barrier for transition. At steady state, depending upon the flow rate, the energy landscape can either have one or two energy wells. An energy landscape with one well corresponds to the coiled state at low flow rate and stretched state at high flowrate. The double welled landscape corresponds to the hysteretic regime where both coiled and stretched conformational states coexist across the ensemble population. A key factor in determining the effect of solvent quality is the use of a proper measure of solvent quality. In almost all earlier studies, the effect of molecular weight on solvent quality has been neglected, producing inconsistent results. Here, the solvent quality is quantified carefully such that the effect of molecular weight and temperature is taken into account. Contrary to earlier findings, it is observed that with improvement in solvent quality, the chains unravel faster and the critical strain rate at which the coil to stretch transition takes place decreases. Furthermore, the solvent quality has a profound effect on the scaling of the critical strain rate with molecular weight and on both the transient and steady state properties of the system. Universal functions are shown to exist for the observed dynamic and static properties, which will prove useful in determining the operating parameters for experiments. In particular, the ratio of the two different relaxation times (longest relaxation time and zero shear rate viscosity) is found to be a universal function of solvent quality independent of molecular weight. The relaxation times (both the longest relaxation time and the zero shear rate viscosity) increase while the critical strain rate is found to decrease with solvent quality. Next, the study of conformational hysteresis is extended to more complicated 3-D flows to understand the effect of flow vorticity on this phenomenon. Heretofore, there has been no systematic methodology for studying the dynamical interactions between polymer molecules and elementary flow patterns in three-dimensional flows. Such a framework is essential not just for gaining valuable insights into the physics of complex fluids at a fundamental level, but it is also crucial for various important applications like turbulent drag reduction where the underlying physical mechanisms involve dynamical interactions between polymers and turbulence fine scale flow features. Such a study is presented here to provide a framework to interpret complex fluid phenomenon in terms of elementary flow patterns. We investigate the conformational hysteresis using rigorous Brownian dynamics simulations and specifically explore the effect of flow vorticity on the lifetime and width of the hysteresis window in 3-D flows. A systematic procedure is developed with careful eigenvalue analysis to explore the sole effect of vorticity on polymer dynamics keeping the principal strain rate fixed. It is observed that the hysteresis width shrinks due to increase in flow vorticity irrespective of the flow type (bi-extensional, bi-compressional, spiral-inwards, spiral-outwards etc). This is further traced to the alignment of eigenvectors with the principal eigenvector direction leading to enhanced fluctuations. Vorticity is found to have a significant effect on both the transient and the steady state properties. Understanding the effect of vorticity on polymer conformational hysteresis can further help in understanding the fundamental processes in complex flows.
Book Synopsis Determination of Nonlinear Viscoelastic Properties of Dilute Drag Reducing Polymer Solutions by a Transient Response Method by : Chen Fai Tsai
Download or read book Determination of Nonlinear Viscoelastic Properties of Dilute Drag Reducing Polymer Solutions by a Transient Response Method written by Chen Fai Tsai and published by . This book was released on 1976 with total page 528 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Floating, Flowing, Flying by : D. Dijkstra
Download or read book Floating, Flowing, Flying written by D. Dijkstra and published by Springer Science & Business Media. This book was released on 2013-04-17 with total page 251 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book is dedicated to Pieter J. Zandbergen on the occasion of his sixty-fifth birthday. It contains fourteen original contributions written by specialized authors and deals with the application of mathematics and numerical analysis to a wide variety of problems in fluid dynamics and related fields. At present the research field of computational fluid dynamics is growing strongly and the book is therefore of interest to applied mathematicians, theoretical physicists and engineers.
Book Synopsis Multiphase Flow in Polymer Processing by : Chang Han
Download or read book Multiphase Flow in Polymer Processing written by Chang Han and published by Elsevier. This book was released on 2012-12-02 with total page 476 pages. Available in PDF, EPUB and Kindle. Book excerpt: Multiphase Flow in Polymer Processing focuses on dispersed and stratified multiphase flow in polymer processing. This book explores the rheological behavior of multiphase (or multicomponent) polymeric systems as they are involved in various fabrication operations. It also outlines the importance of the morphological states of multiphase polymeric systems to explain the systems, rheological behavior in the fluid state, and mechanical behavior in the solid state. This monograph consists of eight chapters divided into two parts. After discussing dispersed and stratified multiphase flow in polymer processing, it introduces the reader to the fundamentals of rheology. The following chapters focus on the rheological behavior of particulate-filled polymeric systems and heterogeneous polymeric systems; the phenomenon of droplet breakup in dispersed flow; and gas-charged polymeric systems. The role of the discrete phase (that is, solid particles, liquid droplets, gas bubbles) in determining the bulk rheological properties of the multiphase system is highlighted, along with some representative polymer processing operations (namely, fiber spinning and injection molding) of the multiphase (or multicomponent) polymeric systems. Coextrusion in cylindrical, rectangular, and annular dies is also considered. The final chapter is devoted to the phenomenon of interfacial instability in coextrusion. This text will be a useful resource for chemists, chemical engineers, and those in the polymer processing industry.
