Download or read book Transient Dynamics of Concentrated Particulate Suspensions Under Shear written by Endao Han and published by Springer Nature. This book was released on 2020-03-09 with total page 102 pages. Available in PDF, EPUB and Kindle. Book excerpt: This thesis demonstrates the first use of high-speed ultrasound imaging to non-invasively probe how the interior of a dense suspension responds to impact. Suspensions of small solid particles in a simple liquid can generate a rich set of dynamic phenomena that are of fundamental scientific interest because they do not conform to the typical behavior expected of either solids or liquids. Most remarkable is the highly counter-intuitive ability of concentrated suspensions to strongly thicken and even solidify when sheared or impacted. The understanding of the mechanism driving this solidification is, however, still limited, especially for the important transient stage while the response develops as a function of time. In this thesis, high-speed ultrasound imaging is introduced to track, for the first time, the transition from the flowing to the solidified state and directly observe the shock-like shear fronts that accompany this transition. A model is developed that agrees quantitatively with the experimental measurements. The combination of imaging techniques, experimental design, and modeling in this thesis represents a major breakthrough for the understanding of the dynamic response of dense suspensions, with important implications for a wide range of applications ranging from the handling of slurries to additive manufacturing.
Download or read book Transient Dynamics in Dense Colloidal Suspensions Under Shear written by Marco Laurati and published by . This book was released on 2012 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Theory and Applications of Colloidal Suspension Rheology written by Norman J. Wagner and published by Cambridge University Press. This book was released on 2021-04-15 with total page 438 pages. Available in PDF, EPUB and Kindle. Book excerpt: An essential text on practical application, theory and simulation, written by an international coalition of experts in the field and edited by the authors of Colloidal Suspension Rheology. This up-to-date work builds upon the prior work as a valuable guide to formulation and processing, as well as fundamental rheology of colloidal suspensions. Thematically, theory and simulation are connected to industrial application by consideration of colloidal interactions, particle properties, and suspension microstructure. Important classes of model suspensions including gels, glasses and soft particles are covered so as to develop a deeper understanding of industrial systems ranging from carbon black slurries, paints and coatings, asphalt, cement, and mine tailings, to natural suspensions such as biocolloids, protein solutions, and blood. Systematically presenting the established facts in this multidisciplinary field, this book is the perfect aid for academic researchers, graduate students, and industrial practitioners alike.
Download or read book Dynamics and Rheology of Particulate Suspensions Undergoing Steady and Unsteady Shear Flows written by Hyun-Ok Park and published by . This book was released on 2010 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Secondly, the stability and rheology of the single walled carbon nanotube (SWNT) suspensions prepared by interfacial trapping method is examined and compared to a conventional method of ultracentrifugation. Since the rheological properties are sensitive to the suspension microstructure, the change of rheological properties, such as viscosity, can be employed as a systematic standard of stability. The steady shear viscosities have been measured and compared as a function of shear rate and aging time of the suspension. Also, the visual states of the suspension have been observed. The rheology of the SWNT suspensions depends on the preparation of surfactant solution. Also, the interfacial trapping method generated similar behaviors to the SWNT suspension prepared by the ultracentrifugation method. Finally, the dynamics of non-colloidal spheres in oscillatory shear flow is studied by experiment and simulation. Two distinct scales are observed for the development of the rheology in time. At small total strains, a rapid decay of ... is observed, while ... and ... remain constant. However, the evolution of the complex viscosity is observed over large total strains, indicating microstructural changes over long times. Also, this suspension system shows a non-monotonic dependence of viscosity on strain amplitude. Stokesian dynamics simulations are used to correlate the rheology and microstructures.
Download or read book Developments in the Flow of Complex Fluids in Tubes written by Dennis A. Siginer and published by Springer. This book was released on 2014-11-11 with total page 169 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book is dedicated to the tube flow of viscoelastic fluids and Newtonian single and multi-phase particle-laden fluids. This succinct volume collects the most recent analytical developments and experimental findings, in particular in predicting the secondary field, highlighting the historical developments which led to the progress made. This book brings a fresh and unique perspective and covers and interprets efforts to model laminar flow of viscoelastic fluids in tubes and laminar and turbulent flow of single and multi-phase particle-laden flow of linear fluids in the light of the latest findings.
Download or read book Probing Out of Equilibrium Soft Matter written by Roberto Cerbino and published by Frontiers Media SA. This book was released on 2023-04-11 with total page 125 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book The Shear Induced Migration of Particulates in Concentrated Suspensions written by David Trent Leighton (Jr.) and published by . This book was released on 1985 with total page 632 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Two dimensional Transient Flows and Stability of Concentrated Suspensions of Clay Particles and Rheology written by Xin Huang and published by . This book was released on 1999 with total page 414 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Particles in Oscillatory Flows written by Peter Alexander Hope and published by . This book was released on 2014 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: This document describes an experimental investigation of two different particle systems under conditions of oscillatory flow. The 1st system being concentrated suspensions of non-motile particles and the 2nd system being dilute suspensions of swimming algae. This document focuses on the study of the jamming of concentrated suspensions of particles (primarily in oscillatory flows), and the response of swimming algae to oscillatory shear flows. The flow characteristics of concentrated colloidal and granular suspensions are known to display a variety of interesting flow characteristics such as shear thinning and discontinuous shear thickening. These depend on a wide range of parameters such as concentration, particle size, rate of deformation and many more. During the flow of concentrated suspensions, they can change from behaving like a fluid and flowing to behaving like a solid which can fracture or yield. Many aspects of this transition are still not understood. This phenomenon has important applications in process flow of slurries, the development of light weight bullet proof vests and as a dampening fluid within vehicle suspensions. This thesis shows that when concentrated colloidal and granular suspensions are subjected to oscillatory squeeze film flow, they display reversible local flow field distortions and macroscopic shape changes which are likely related to jamming. It highlights a range of unreported behaviours of suspensions in oscillatory squeeze film flows. This document also provides rheological data on the discontinuous shear thickening and jamming of a wide variety of different suspensions in both continuous and oscillatory shear flows. Swimming micro-organisms are currently used in a wide variety of health and cosmetic products. They are also being researched for use in the production of biodiesel. Swimming algae are grown within photo-bioreactors where their swimming characteristics can have a major impact on the reactors overall efficiency. Additionally a major issue in the production of swimming algae is the need for them to be concentrated using centrifugation which is energy intensive. This thesis shows that in oscillatory shear flows, gravitactic swimming algae can order their swimming directions in the vorticity directions of the oscillating flow field. This has potential applications in the development of a method to encourage micro-swimmers to self-concentrate. Suggestions of other investigations into the ordering behaviour of swimming micro-organisms are also provided. This document also displays a unique and cheap method for applying oscillatory squeeze film flows while allowing samples to be viewed underneath a microscope. It also makes suggestions on how this method could be enhanced. This device has applications in carrying out squeeze film tests to examine the rheological properties of fluids.
Download or read book The Constitutive Modeling of Microstructure and Total Stress in Particulate Suspensions written by Jonathan James Stickel and published by . This book was released on 2006 with total page 278 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Physics Briefs written by and published by . This book was released on 1994 with total page 916 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Origin of Shear induced Diffusion in Particulate Suspensions written by Phong Ngoc Pham and published by . This book was released on 2016 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Even at low Reynolds number, particles within a shear flow exhibit irreversible dynamics. Many theories have been put forth to explain this phenomenon, the origin of irreversibility remains unclear. An integrated program of experimental and computational studies has been performed to assess the origin of the irreversible behavior of particles. Numerical simulations were used to evaluated the relative importance of long-range hydrodynamic interactions, lubrication, and contact forces. By isolating contribution of these interactions, we have shown that neither the long-range hydrodynamic interactions nor the lubrication are responsible for irreversibility. Solid contacts between particles largely dominate this phenomenon. However, producing realistic results requires both contact interactions and lubrication. Two different experiments were performed to address the role of contacts between particles in sheared suspensions. In the first experiment, the particle trajectories are irreversible during the first cycle but reversible for the next cycles. By showing that the magnitude of irreversibility increases with the particle roughness, we provide direct evidence that contacts occur in viscous flow. Experimental particle trajectories are well captured by the numerical model. In the second experiment, performed in a homogeneous suspension, the role of solid collisions was also revealed by showing that the critical strain amplitude depends on the particle roughness. A geometrical model based on the assumption that colliding particles produce irreversibility was derived. The model successfully reproduces the measured values of the critical strain amplitude.
Download or read book A Numerical Study on Shear induced Migration of Particles in Concentrated Suspensions written by Zhiwu Fang and published by . This book was released on 1997 with total page 442 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Particulates And Continuum Multiphase Fluid Dynamics written by Shao L. Soo and published by CRC Press. This book was released on 1989-06-01 with total page 428 pages. Available in PDF, EPUB and Kindle. Book excerpt: Treating multiphase systems with emphasis on the aspect of fluid dynamics and as an introduction to research in multiphase flow, this book covers definitive concepts, methods, and theories which have been validated by experimental results. A textbook for college seniors and graduate students and a research reference, it is a coherent presentation that facilitates the understanding of physical interactions. The book's focus is fluid dynamics, with extension to other transport processes of heat and mass transfer, and chemical relations to illustrate applications of multiphase flow. The exercise problems at the end of each chapter assist the reader in formulating and solving physical problems and gaining a sense of magnitude of interacting effects and events. Extended details and corollaries are also included in these exercise problems. Some of the topics in the exercise problems may also be incorporated as topics for the lectures.
Download or read book Applied Mechanics Reviews written by and published by . This book was released on 1974 with total page 276 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Mathematical Methods And Models In Composites Second Edition written by Vladislav Mantic and published by World Scientific. This book was released on 2023-03-10 with total page 731 pages. Available in PDF, EPUB and Kindle. Book excerpt: Mathematical Methods and Models in Composites (Second Edition) provides an in-depth treatment of modern and rigorous mathematical methods and models applied to composites modeling on the micro-, meso-, and macro scale. There has been a steady growth in the diversity of such methods and models that are used in the analysis and characterization of composites, their behavior, and their associated phenomena and processes. This second edition expands upon the success of the first edition, and has been substantially revised and updated.Written by well-known experts in different areas of applied mathematics, physics, and composite engineering, this book is mainly focused on continuous fiber reinforced composites and their ever increasing range of applications (for example, in the aerospace industry), though it also covers other kind of composites. The chapters cover a range of topics including, but not limited to: scaling and homogenization procedures in composites, thin plate and wave solutions in anisotropic materials, laminated structures, fiber-reinforced nonlinearly elastic solids, buckling and postbuckling, fracture and damage analysis of composites, and highly efficient methods for simulation of composites manufacturing such as resin transfer molding. The results presented are useful for the design, fabrication, testing and industrial applications of composite components and structures.This book is an essential reference for graduate and doctoral students, as well as researchers in mathematics, physics and composite engineering. Explanations and references in the book are sufficiently detailed so as to provide the necessary background to further investigate the fascinating subject of composites modeling and explore relevant research literature. It is also suitable for non-experts who wish to have an overview of the mathematical methods and models used for composites, and of the open problems in this area that require further research.
Download or read book Theory and Applications of Colloidal Suspension Rheology written by Norman J. Wagner and published by Cambridge University Press. This book was released on 2021-04-15 with total page 437 pages. Available in PDF, EPUB and Kindle. Book excerpt: Essential text on the practical application and theory of colloidal suspension rheology, written by an international coalition of experts.
