Download or read book Computational Studies of Pair Wise Interactions Between Drops and the Dynamics of Concentrated Emulsions at Finite Inertia written by Peter Ojo Olapade and published by ProQuest. This book was released on 2007 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: ?Pub Inc A computational study of pair-wise interactions between drops and the dynamics of concentrated emulsion is undertaken using a three-dimensional front-tracking finite difference method. The study is motivated by numerous industrial and domestic applications of multi-fluid flow. We first investigate the effects of inertia on pair-wise interaction between drops in a Newtonian system. It is seen that at high Re, increase in the initial cross-stream separation between the two interacting drops slightly increases the drops deformation. In addition, it is observed that if the separation position of the two interacting drops along the flow direction is so small that the drops can slide past each other even at high Re, increase in Re leads to an increase in the drops' lateral displacement after separation. However, if the separation position of the two interacting drops is more than twice the undeformed radius of the drops, the drops may not be able to slide past each other if Re is sufficiently large. The deformability of the drops also affects their lateral displacement. We observe that deformable drops are not able to slide past each other under the same conditions where drops with very low Ca can slide past each other. It appears that the flow modification caused by the drops deformation creates a downward force on the left drop. Next, we examine the effects of inertia on drop dynamics in a concentrated emulsion. We observe that the effects of inertia on weak hydrodynamic interaction at low dispersed phase volume fraction do not result in increased volume-averaged drop deformation. However, for concentrated emulsions, interaction between drops at increased Re leads to an increase in volume-averaged drop deformation especially when Ca of the drops is low. A single drop tends to rotate towards the vertical direction at increased Re. However, interactions between drops suppress this tendency. Finally, we investigate the effects of viscoelasticity on interactions between drops. We notice that the interaction between viscoelastic drops is similar to that between Newtonian drops. However, we observe that the interaction in the case of Newtonian drops in a viscoelastic matrix is different from that of Newtonian fluids. Viscoelastic stresses in the matrix-phase viscoelastic system inhibit the drops' lateral displacement and cause the drops to align more with the flow direction. Similar to what has been observed in single-drop deformation, the De of the matrix-phase viscoelasticity has non-monotonic effects on the drops' deformation when the drops are aligned with each other along the compressional quadrant of the shear flow.
Download or read book Computational Study of Fluid Particles Dynamics of Drops Rheology of Emulsions and Mechanics of Biological Cells written by Xiaoyi Li and published by . This book was released on 2007 with total page 283 pages. Available in PDF, EPUB and Kindle. Book excerpt: We next investigate the material response of an emulsion of such drops. A numerical methodology for calculating the rheological stresses based on drop shapes is developed. We use it to study the rheology of a dilute emulsion in steady shear as well as oscillating extensional flow at finite inertia. Inertia-induced morphological change of drops gives rise to abnormal rheological responses such as shear thickening and sign change of normal stresses in shear flow, and a negative elastic modulus in oscillating extensional flow.
Download or read book Predicting Droplet Breakup in a Concentrated Emulsion Flowing in a Microfluidic System written by Jian Wei Khor and published by . This book was released on 2019 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: In recent years, droplet microfluidics has been increasingly popular in chemistry and biology where biological or chemical samples are encapsulated in nL-pL droplets. Some typical applications are using droplet microfluidics as a flow cytometer, as a drug discovery platform, for nanoparticle synthesis, and for tissue engineering. Unlike solid wells in multi-well plates, droplets are prone to instabilities at the liquid--liquid interface. They can undergo coalescence or break-up, and compromise the accuracy of the assay. While coalescence has been avoided by using appropriate stabilizers, the break-up of droplets--especially those within a concentrated emulsion--remains a limiting factor affecting the throughput of the assay, in particular during droplet content interrogation step. Unfortunately, previous studies on single droplet break-up cannot provide a thorough explanation as to why droplets break in highly concentrated emulsion flow in confined space. Furthermore, most present literature studies emulsion interactions and rheology in the macro-scale and don't study droplet-droplet interactions and individual droplet break-up within a highly concentrated emulsion flowing in a confined space. Thus, this work aims to study the physics of droplet break-up in a highly concentrated emulsion flowing into a narrow constriction. This work is categorized into three parts: (1) Quantify the droplet break-up probability at various flow parameters, channel geometries, and emulsion properties (2) Study the effects of drop pair interactions in a highly concentrated emulsion flow that leads to droplet break-up (3) Study the effects of drop shapes in a highly concentrated emulsion flow that leads to droplet break-up For the first part, the statistics of droplet break-up within a highly concentrated emulsion entering a narrow constriction at various flow parameters, channel geometries, and emulsion properties. It was found that there exist a scaling law for the break-up probability at various capillary number. For the second part, the drop pair interactions as they enter the narrow constriction are studied. It was found that the relative drop pair locations as the drops are entering the narrow constriction is a dominant factor in determining the drop break-up outcome. Three regimes were found where drops will either have a break, not break, and bistable outcome. For the third part, the drop shape as they enter the narrow constriction are studied. It was found that there are a diverse range of drop shapes occurring as the drops are entering the narrow constriction. This leads to drastically different stress balances for each individual drops as they enter the narrow constriction. For this part, a machine learning model and training strategy is proposed to describe droplet shapes and predict its break-up outcome accurately. In conclusion, this work represents a critical step towards the understanding of the physics governing drop instability in a highly concentrated emulsions flowing into a narrow constriction.
Download or read book Bulletin of the Atomic Scientists written by and published by . This book was released on 1961-05 with total page 88 pages. Available in PDF, EPUB and Kindle. Book excerpt: The Bulletin of the Atomic Scientists is the premier public resource on scientific and technological developments that impact global security. Founded by Manhattan Project Scientists, the Bulletin's iconic "Doomsday Clock" stimulates solutions for a safer world.
Download or read book Soft and Fragile Matter written by Michael E. Cates and published by CRC Press. This book was released on 2000-01-01 with total page 956 pages. Available in PDF, EPUB and Kindle. Book excerpt: Covering colloids, polymers, surfactant phases, emulsions, and granular media, Soft and Fragile Matter: Nonequilibrium Dynamics, Metastability and Flow (PBK) provides self-contained and pedagogical coverage of the rapidly advancing field of systems driven out of equilibrium, with a strong emphasis on unifying conceptual principles rather than material-specific details. Written by internationally recognized experts, the book contains introductions at the level of a graduate course in soft condensed matter and statistical physics to the following areas: experimental techniques, polymers, rheology, colloids, computer simulation, surfactants, phase separation kinetics, driven systems, structural glasses, slow dynamics, and granular materials. These topics lead to a range of exciting applications at the forefront of current research, including microplasticity of emulsions, sequence design of copolymers, branched polymer dynamics, nucleation kinetics in colloids, multiscale modeling, flow-induced surfactant textures, fluid demixing under shear, two-time correlation functions, chaotic sedimentation dynamics, and sound propagation in powders. Balancing theory, simulation, and experiment, this broadly-based, pedagogical account of a rapidly developing field is an excellent compendium for graduate students and researchers in condensed matter physics, materials science, and physical chemistry.
Download or read book Bubbles Drops and Particles written by R. Clift and published by Courier Corporation. This book was released on 2013-04-22 with total page 402 pages. Available in PDF, EPUB and Kindle. Book excerpt: This volume offers a unified treatment and critical review of the literature related to the fluid dynamics, heat transfer, and mass transfer of single bubbles, drops, and particles. 1978 edition.
Download or read book Computational Methods for Multiphase Flow written by Andrea Prosperetti and published by Cambridge University Press. This book was released on 2009-06-25 with total page 392 pages. Available in PDF, EPUB and Kindle. Book excerpt: Thanks to high-speed computers and advanced algorithms, the important field of modelling multiphase flows is an area of rapid growth. This one-stop account – now in paperback, with corrections from the first printing – is the ideal way to get to grips with this topic, which has significant applications in industry and nature. Each chapter is written by an acknowledged expert and includes extensive references to current research. All of the chapters are essentially independent and so the book can be used for a range of advanced courses and the self-study of specific topics. No other book covers so many topics related to multiphase flow, and it will therefore be warmly welcomed by researchers and graduate students of the subject across engineering, physics, and applied mathematics.
Download or read book Intermolecular and Surface Forces written by Jacob N. Israelachvili and published by Academic Press. This book was released on 2011-07-22 with total page 708 pages. Available in PDF, EPUB and Kindle. Book excerpt: Intermolecular and Surface Forces describes the role of various intermolecular and interparticle forces in determining the properties of simple systems such as gases, liquids and solids, with a special focus on more complex colloidal, polymeric and biological systems. The book provides a thorough foundation in theories and concepts of intermolecular forces, allowing researchers and students to recognize which forces are important in any particular system, as well as how to control these forces. This third edition is expanded into three sections and contains five new chapters over the previous edition. Starts from the basics and builds up to more complex systems Covers all aspects of intermolecular and interparticle forces both at the fundamental and applied levels Multidisciplinary approach: bringing together and unifying phenomena from different fields This new edition has an expanded Part III and new chapters on non-equilibrium (dynamic) interactions, and tribology (friction forces)
Download or read book Multiphase Flow Handbook Second Edition written by Efstathios Michaelides and published by CRC Press. This book was released on 2016-10-26 with total page 1559 pages. Available in PDF, EPUB and Kindle. Book excerpt: The Multiphase Flow Handbook, Second Edition is a thoroughly updated and reorganized revision of the late Clayton Crowe’s work, and provides a detailed look at the basic concepts and the wide range of applications in this important area of thermal/fluids engineering. Revised by the new editors, Efstathios E. (Stathis) Michaelides and John D. Schwarzkopf, the new Second Edition begins with two chapters covering fundamental concepts and methods that pertain to all the types and applications of multiphase flow. The remaining chapters cover the applications and engineering systems that are relevant to all the types of multiphase flow and heat transfer. The twenty-one chapters and several sections of the book include the basic science as well as the contemporary engineering and technological applications of multiphase flow in a comprehensive way that is easy to follow and be understood. The editors created a common set of nomenclature that is used throughout the book, allowing readers to easily compare fundamental theory with currently developing concepts and applications. With contributed chapters from sixty-two leading experts around the world, the Multiphase Flow Handbook, Second Edition is an essential reference for all researchers, academics and engineers working with complex thermal and fluid systems.
Download or read book Polymer Colloids written by Rodney Priestley and published by Royal Society of Chemistry. This book was released on 2019-12-02 with total page 442 pages. Available in PDF, EPUB and Kindle. Book excerpt: Academic and industrial research around polymer-based colloids is huge, driven both by the development of mature technologies, e.g. latexes for coatings, as well as the advancement of new materials and applications, such as building blocks for 2D/3D structures and medicine. Edited by two world-renowned leaders in polymer science and engineering, this is a fundamental text for the field. Based on a specialised course by the editors, this book provides the reader with an invaluable single source of reference. The first section describes formation, explaining basic properties of emulsions and dispersion polymerization, microfluidic approaches to produce polymer-based colloids and formation via directed self-assembly. The next section details characterisation methodologies from microscopy and small angle scattering, to surface science and simulations. The final chapters close with applications, including Pickering emulsions and molecular engineering for materials development. A comprehensive guide to polymer colloids, with contributions by leaders in their respective areas, this book is a must-have for researchers and practitioners working across polymers, soft matter and chemical and molecular engineering.
Download or read book Proceedings of the ASME Fluids Engineering Division Summer Conference 2006 Forums written by American Society of Mechanical Engineers. Fluids Engineering Division and published by . This book was released on 2006 with total page 1092 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Flowing Matter written by Federico Toschi and published by Springer Nature. This book was released on 2019-09-25 with total page 309 pages. Available in PDF, EPUB and Kindle. Book excerpt: This open access book, published in the Soft and Biological Matter series, presents an introduction to selected research topics in the broad field of flowing matter, including the dynamics of fluids with a complex internal structure -from nematic fluids to soft glasses- as well as active matter and turbulent phenomena. Flowing matter is a subject at the crossroads between physics, mathematics, chemistry, engineering, biology and earth sciences, and relies on a multidisciplinary approach to describe the emergence of the macroscopic behaviours in a system from the coordinated dynamics of its microscopic constituents. Depending on the microscopic interactions, an assembly of molecules or of mesoscopic particles can flow like a simple Newtonian fluid, deform elastically like a solid or behave in a complex manner. When the internal constituents are active, as for biological entities, one generally observes complex large-scale collective motions. Phenomenology is further complicated by the invariable tendency of fluids to display chaos at the large scales or when stirred strongly enough. This volume presents several research topics that address these phenomena encompassing the traditional micro-, meso-, and macro-scales descriptions, and contributes to our understanding of the fundamentals of flowing matter. This book is the legacy of the COST Action MP1305 “Flowing Matter”.
Download or read book Bubbles Drops and Particles in Non Newtonian Fluids written by R.P. Chhabra and published by CRC Press. This book was released on 2006-07-25 with total page 801 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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
Download or read book Biological Flows written by Colin G. Caro and published by Springer. This book was released on 2013-12-19 with total page 369 pages. Available in PDF, EPUB and Kindle. Book excerpt: Biomechanics has a distinguished history extending at least to the 16th Century. However the later half oftbis century has seen an explosion ofthe field with it being viewed as affering exciting challenges for physical scientists and engineers interested in the life sciences, and wonderful opportunities for life scientists eager to collaborate with physical scientists and engineers and to render their scientific work more fundamental. That the field is now weil established and expanding is demonstrated by the formation of a World Committee for Biomechanics and the success and large participation in the 1st and 2nd World Congresses of Biomechanics, held respectively in San Diego in 1990 and in Amsterdam in 1994. With more than 1350 scientific papers delivered at the 2nd World Congress, either within symposia or oral or poster sessions, it would have been out of the question to try to produce comprehensive edited proceedings. Moreover, we are confident that most of the papers have been or will be published in one ofthe excellentjoumals covering the field. But of effort contributed by the plenary lecturers and the tutorial we thought that the large amount and keynote speakers of various symposia deserved tobe recognised in the form of a specific publication, thus also allowing those unable to attend the presentatiops . . tC\ sh?r~ in the findings. Furthermore, we feel that there is now a need to review aspects 'oftlie freld.
Download or read book Suspension Acoustics written by Samuel Temkin and published by Cambridge University Press. This book was released on 2005-07-25 with total page 432 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book is an introduction to the physics of suspensions of bubbles, droplets, and solid particles in both gases and fluids. Rather than treating each combination separately, a unified approach is used that permits most particle-fluid combination types to be discussed together. To do this, the book first presents a detailed discussion of the basic particle motions that small particles can sustain, paying particular attention to translations and pulsations, and to the thermal effects that occur as a result of those motions. The book then introduces the reader to the dynamics and thermodynamics of suspensions, with acoustic motions providing the main focus in the latter part of the book. The important acoustic problems of attenuation and dispersion are discussed from several fundamental perspectives. The book concludes with applications of acoustic techniques to the characterization and modification of suspensions by means of acoustic waves.
Download or read book A Modern Course in Transport Phenomena written by David C. Venerus and published by Cambridge University Press. This book was released on 2018-03-15 with total page 537 pages. Available in PDF, EPUB and Kindle. Book excerpt: Integrating nonequilibrium thermodynamics and kinetic theory, this unique text presents a novel approach to the subject of transport phenomena.
Download or read book Fundamentals of Multiphase Flow written by Christopher E. Brennen and published by Cambridge University Press. This book was released on 2005-04-18 with total page 376 pages. Available in PDF, EPUB and Kindle. Book excerpt: Publisher Description
