The Viscosity of Suspensions of Rigid Spherical Particles in Viscoelastic Fluids PDF Download
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Author: Michael Joseph Riddle
Publisher:
ISBN:
Category : Non-Newtonian fluids
Languages : en
Pages : 580
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Book Description
Author: Michael Joseph Riddle
Publisher:
ISBN:
Category : Non-Newtonian fluids
Languages : en
Pages : 580
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Book Description
Author: Francisco Chinesta
Publisher: Elsevier
ISBN: 0081008120
Category : Science
Languages : en
Pages : 398
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Book Description
This book provides a review of the current understanding of the behavior of non-spherical particle suspensions providing experimental results, rheological models and numerical modeling. In recent years, new models have been developed for suspension rheology and as a result applications for nanocomposites have increased. The authors tackle issues within experimental, model and numerical simulations of the behavior of particle suspensions. Applications of non-spherical particle suspension rheology are widespread and can be found in organic matrix composites, nanocomposites, biocomposites, fiber-filled fresh concrete flow, blood and biologic fluids. - Understand how to model and predict the final microstructure and properties of particle suspensions - Explores nano, micro, meso and macro scales - Rheology, thermomechanical and electromagnetic physics are discussed
Author: Nhan Phan-Thien
Publisher: Springer
ISBN: 3319620002
Category : Science
Languages : en
Pages : 312
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Book Description
This book presents an introduction to viscoelasticity, in particular, to the theories of dilute polymer solutions and dilute suspensions of rigid particles in viscous and incompressible fluids. These theories are important, not just because they apply to practical problems of industrial interest, but because they form a solid theoretical base upon which mathematical techniques can be built, from which more complex theories can be constructed, to better mimic material behaviour. The emphasis of this book is not on the voluminous current topical research, but on the necessary tools to understand viscoelasticity. This is a compact book for a first year graduate course in viscoelasticity and modelling of viscoelastic multiphase fluids. The Dissipative Particle Dynamics (DPD) is introduced as a particle-based method, relevant in modelling of complex-structured fluids. All the basic ideas in DPD are reviewed. The third edition has been updated and expanded with new results in the meso-scale modelling, links between the fluid modelling to its physical parameters and new matlab programs illustrating the modelling. Particle-based modelling techniques for complex-structure fluids are added together with some sample programs. A solution manual to the problems is included.
Author: Geoffrey Frank Eveson
Publisher:
ISBN:
Category :
Languages : en
Pages : 249
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Book Description
Author: Nhan Phan-Thien
Publisher: Springer Science & Business Media
ISBN: 3642329586
Category : Science
Languages : en
Pages : 208
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Book Description
This book presents an introduction to viscoelasticity; in particular, to the theories of dilute polymer solutions and dilute suspensions of rigid particles in viscous and incompressible fluids. These theories are important, not just because they apply to practical problems of industrial interest, but because they form a solid theoretical base upon which mathematical techniques can be built, from which more complex theories can be constructed, to better mimic material behaviour. The emphasis is not on the voluminous current topical research, but on the necessary tools to understand viscoelasticity at a first year graduate level. The main aim is to provide a still compact book, sufficient at the level of first year graduate course for those who wish to understand viscoelasticity and to embark in modeling of viscoelastic multiphase fluids. To this end, a new chapter on Dissipative Particle Dynamics (DPD) was introduced which is relevant to model complex-structured fluids. All the basic ideas in DPD are reviewed, with some sample problems to illustrate the methodology.
Author: Z. Zapryanov
Publisher: Springer Science & Business Media
ISBN: 9401592551
Category : Technology & Engineering
Languages : en
Pages : 527
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Book Description
1. Objective and Scope Bubbles, drops and rigid particles occur everywhere in life, from valuable industrial operations like gas-liquid contracting, fluidized beds and extraction to such vital natural processes as fermentation, evaporation, and sedimentation. As we become increasingly aware of their fundamental role in industrial and biological systems, we are driven to know more about these fascinating particles. It is no surprise, therefore, that their practical and theoretical implications have aroused great interest among the scientific community and have inspired a growing number of studies and publications. Over the past ten years advances in the field of small Reynolds numbers flows and their technological and biological applications have given rise to several definitive monographs and textbooks in the area. In addition, the past three decades have witnessed enormous progress in describing quantitatively the behaviour of these particles. However, to the best of our knowledge, there are still no available books that reflect such achievements in the areas of bubble and drop deformation, hydrodynamic interactions of deformable fluid particles at low and moderate Reynolds numbers and hydrodynamic interactions of particles in oscillatory flows. Indeed, only one more book is dedicated entirely to the behaviour of bubbles, drops and rigid particles ["Bubbles, Drops and Particles" by Clift et al. (1978)] and the authors state its limitations clearly in the preface: "We treat only phenomena in which particle-particle interactions are of negligible importance. Hence, direct application of the book is limited to single-particle systems of dilute suspensions.
Author: William Levi Murch
Publisher:
ISBN:
Category :
Languages : en
Pages :
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Book Description
Particle suspensions are ubiquitous across a variety of engineering processes, and examples can be found in oilfield applications, industrial separations, microfluidics, and additive manufacturing. In these applications, it is crucial to control and predict the mobility of the particles -- that is, their motion through a fluid due to an applied force. Often, that applied force is due to gravity, and the process of interest involves the sedimentation of rigid, non-Brownian particles. In many industrially-relevant processes, the suspending fluid is a polymeric fluid, which can exhibit both viscous and elastic flow behavior. In this work, we examine the effect of fluid elasticity on the motion of settling particles. To do so, we use a combination of experiments and large-scale numerical simulations to build a fundamental understanding of how and why the settling motion of spherical particles changes in elastic fluids. We begin by studying the motion of a single spherical particle in a model elastic Boger fluid. Initially, we address the case where a shear flow is imposed in a plane perpendicular to the sphere's motion, referred to as cross (or orthogonal) shear. We study the settling motion in highly elastic fluids, where the sphere's motion and the shear flow both result in significant stretching of the polymers in solution. We find that the shear flow results in polymer tension along the fluid streamlines and creates regions of high polymer stretching in the wake of the sphere which extend into the shear flow direction. We observe that these viscoelastic wake structures, resembling wings, are linked to an increase in the pressure drag, which drives a dramatic decrease in the particle's settling rate in the presence of a cross shear flow. In a surprising extension to this work, we show that rotation of a spherical particle (around the axis aligned with its motion) in an otherwise quiescent elastic fluid can result in the opposite trend: an increase in the sphere's settling rate as a function of its rotation rate. In this case, we propose a mechanism based on the generation of hoop stresses around the rotating and sedimenting sphere. Returning to the case of a spherical particle settling through a sheared elastic fluid, we find that the coupling between the particle's motion and an external shear flow depends on the direction of the applied force relative to the shear flow. Interestingly, when the particle settles in either the shear gradient or shear flow direction, a lateral drift becomes apparent. Utilizing the understanding gained from our single particle studies, we subsequently address the settling motion of a suspension of rigid particles at finite volume fraction. When the fluid is quiescent, we observe a characteristically distinct settling behavior in a viscoelastic suspending fluid compared to a Newtonian fluid: in the viscoelastic fluid, we observe the formation of particle-rich regions which settle more quickly, resulting in an inhomogeneous settling behavior and an overall enhanced settling rate. We propose that this structural concentration instability is driven in part by the lateral drift of particles in elastic fluids due to local concentration variations following random mixing. Alternatively, when a cross shear flow is applied, a hindered settling rate is observed -- we attribute this result to both the effect of elasticity in a cross sheared viscoelastic fluid (as initially addressed for a single particle) and the mixing of the suspension structure due to the shear flow. These results have significant implications for engineering applications involving suspensions of particles settling in both quiescent and flowing polymeric fluids. In summary, we examine the nonlinear coupling between the settling motion of a particle and a surrounding flow field in elastic fluids through a number of fundamental examples. Using experiments and simulations, we infer the coupling relations (when possible) and propose mechanisms to describe them on a physical basis. We use this knowledge to then study the industrially-relevant problem of a suspension of settling particles, with or without an applied flow. This work provides a framework for better understanding and predicting the settling behavior of rigid particles in polymeric fluids.
Author: Ron Darby
Publisher:
ISBN:
Category : Science
Languages : en
Pages : 664
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Book Description
Author: Crispulo Gallegos
Publisher: EOLSS Publications
ISBN: 1848263201
Category : Economic development
Languages : en
Pages : 468
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Book Description
Rheology is a component of Encyclopedia of Chemical Sciences, Engineering and Technology Resources in the global Encyclopedia of Life Support Systems (EOLSS), which is an integrated compendium of twenty Encyclopedias. Rheology is the study of the flow of matter. It is classified as a physics discipline and focuses on substances that do not maintain a constant viscosity or state of flow. That can involve liquids, soft solids and solids that are under conditions that cause them to flow. It applies to substances which have a complex molecular structure, such as muds, sludges, suspensions, polymers and other glass formers, as well as many foods and additives, bodily fluids and other biological materials. The theme on Rheology focuses on five main areas, namely, basic concepts of rheology; rheometry; rheological materials, rheological processes and theoretical rheology. Of course, many of the chapters contain material from more than one general area. Rheology is an interdisciplinary subject which embraces many aspects of mathematics, physics, chemistry, engineering and biology. These two volumes are aimed at the following five major target audiences: University and College students Educators, Professional practitioners, Research personnel and Policy analysts, managers, and decision makers and NGOs.
Author: R.P. Chhabra
Publisher: CRC Press
ISBN: 1420015389
Category : Science
Languages : en
Pages : 801
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Book Description
Bubbles, Drops, and Particles in Non-Newtonian Fluids, Second Edition continues to provide thorough coverage of the scientific foundations and the latest advances in particle motion in non-Newtonian media. The book demonstrates how dynamic behavior of single particles can yield useful information for modeling transport processes in complex multipha
