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Author : William M. Healy
Publisher :
ISBN 13 :
Total Pages : 406 pages
Book Rating : 4.:/5 (424 download)
Download or read book Modeling the Impact of a Liquid Droplet on a Solid Surface written by William M. Healy and published by . This book was released on 1999 with total page 406 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Shrikant A. Bokil
Publisher :
ISBN 13 :
Total Pages : 88 pages
Book Rating : 4.:/5 (884 download)
Download or read book On Computational Modeling of Dynamic Drop-surface Interactions During Post-impact Spreading of Water and Aqueous Surfactant Solution written by Shrikant A. Bokil and published by . This book was released on 2013 with total page 88 pages. Available in PDF, EPUB and Kindle. Book excerpt: The objective of the present work is to develop a computational model to simulate liquid droplet impact and post-impact spread-recoil dynamics on a horizontal, flat, smooth, dry surface. The governing equations of continuity and momentum are solved to simulate the transient flow. Volume of Fluid (VOF) method is applied to capture continuously deforming gas-liquid interface. Simulations are carried out for pure water and aqueous solution of Sodium Dodecyl Sulphate (SDS) droplet impact on a hydrophobic (Teflon) surface. Simulations are carried out for Weber number 20 and 80 with impact velocities of 0.7 m/s and 1.4 m/s and droplet diameters of 2 mm and 3 mm, respectively. The results show increase in maximum spreading factor with increase in Weber number. Computational results predict advancing, recoiling and bouncing behavior of water droplets on the Teflon surface which agrees with the experimental observations available in literature. Aqueous solution of Sodium Dodecyl Sulphate (SDS) at twice the Critical Micelle Concentration (2xCMC) is used and its time and space dependent surface tension behavior is modeled. It is observed that dynamic surface tension plays a primary role in the modification of droplet spread-recoil process. The simulation results for surfactant solution show larger drop spread followed by weaker recoil and no rebound from the surface. These results are validated with experimental measurements reported in the literature. Non-isothermal impact conditions are investigated to study heat transfer phenomenon during droplet impact. The solid surface is maintained at 353°K and corresponding heat flux values and overall heat transfer rates for both pure water and surfactant solution drops are calculated. The results indicate that aqueous surfactant solution improves the liquid-solid wetting area and results in higher heat transfer compared to pure water droplet.
Author : Martin Rein
Publisher : Springer
ISBN 13 : 3709125944
Total Pages : 317 pages
Book Rating : 4.7/5 (91 download)
Download or read book Drop-Surface Interactions written by Martin Rein and published by Springer. This book was released on 2014-05-04 with total page 317 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book presents a comprehensive overview of fluid mechanical, thermal and physico-chemical aspects of drop-surface interactions. Basic physical mechanisms pertaining to free-surface flow phenomena characteristic of drop impact on solid and liquid surfaces are explained emphasizing the importance of scaling. Moreover, physico-chemical fundamentals relating to a forced spreading of complex solutions, analytical tools for calculating compressibility effects, and heat transfer and phase change phenomena occurring during solidification and evaporation processes, respectively, are introduced in detail. Finally, numerical approaches particularly suited for modeling drop-surface interactions are consisely surveyed with a particular emphasis on boundary integral methods and Navier-Stokes algorithms (volume of fluid, level set and front tracking algorithms). The book is closed by contributions to a workshop on Drop-Surface Interactions held at the International Centre of Mechanical Sciences.
Author : Roberto Mauri
Publisher : Springer Science & Business Media
ISBN 13 : 3709112273
Total Pages : 181 pages
Book Rating : 4.7/5 (91 download)
Download or read book Multiphase Microfluidics: The Diffuse Interface Model written by Roberto Mauri and published by Springer Science & Business Media. This book was released on 2012-05-31 with total page 181 pages. Available in PDF, EPUB and Kindle. Book excerpt: Diffuse interface (D.I.) model for muliphase flows.- Phase separation of viscous ternary liquid mixtures.- Dewetting and decomposing films of simple and complex liquids.- Phase-field models. Multiphase flows are typically described assuming that the different phases are separated by a sharp interface, with appropriate boundary conditions. This approach breaks down whenever the lengthscale of the phenomenon that is being studied is comparable with the real interface thickness, as it happens, for example, in the coalescence and breakup of bubbles and drops, the wetting and dewetting of solid surfaces and, in general, im micro-devices. The diffuse interface model resolves these problems by assuming that all quantities can vary continuously, so that interfaces have a non-zero thickness, i.e. they are "diffuse". The contributions in this book review the theory and describe some relevant applications of the diffuse interface model for one-component, two-phase fluids and for liquid binary mixtures, to model multiphase flows in confined geometries.
Author : Kevin Launglucknavalai
Publisher :
ISBN 13 : 9781303065484
Total Pages : 64 pages
Book Rating : 4.0/5 (654 download)
Download or read book Simulation of Liquid Droplet in Air and on a Solid Surface written by Kevin Launglucknavalai and published by . This book was released on 2013 with total page 64 pages. Available in PDF, EPUB and Kindle. Book excerpt: Although multiphase gas and liquid phenomena occurs widely in engineering problems, many aspects of multiphase interaction like within droplet dynamics are still not quantified. This study aims to qualify the Lattice Boltzmann (LBM) Interparticle Potential multiphase com- putational method in order to build a foundation for future multiphase research. This study consists of two overall sections. The first section in Chapter 2 focuses on understanding the LBM method and Interparti- cle Potential model. It outlines the LBM method and how it relates to macroscopic fluid dynamics. The standard form of LBM is obtained. The perturbation solution obtaining the Navier-Stokes equations from the LBM equation is presented. Finally, the Interparticle Potential model is incorporated into the numerical LBM method. The second section in Chapter 3 presents the verification and validation cases to confirm the behavior of the single-phase and multiphase LBM models. Experimental and analytical results are used briefly to compare with numerical results when possible using Poiseuille channel flow and flow over a cylinder. While presenting the numerical results, practical considerations like converting LBM scale variables to physical scale variables are considered. Multiphase results are verified using Laplaces law and artificial behaviors of the model are explored. In this study, a better understanding of the LBM method and Interparticle Potential model is gained. This allows the numerical method to be used for comparison with experimental results in the future and provides a better understanding of multiphase physics overall.
Author : John C. Slattery
Publisher : Springer Science & Business Media
ISBN 13 : 1475720904
Total Pages : 1174 pages
Book Rating : 4.4/5 (757 download)
Download or read book Interfacial Transport Phenomena written by John C. Slattery and published by Springer Science & Business Media. This book was released on 2013-04-17 with total page 1174 pages. Available in PDF, EPUB and Kindle. Book excerpt: Transport phenomena is used here to descril>e momentum, energy, mass, and entropy transfer (Bird et al. 1960, 1980). It includes thermodynamies, a special case of which is thermostatics. Interfacial transport phenomena refers to momentum, energy , mass, and entropy transfer within the immediate neighborhood of a phase interface, including the thermodynamies of the interface. In terms of qualitative physical observations, this is a very old field. Pliny the EIder (Gaius Plinius Secundus, 23-79 A.D.; Pliny 1938) described divers who released small quantities of oil from their mouths, in order to damp capillary ripples on the ocean surface and in this way provide more uniform lighting for their work. Similar stories were retold by Benjamin Franklin, who conducted experiments of his own in England (V an Doren 1938). In terms of analysis, this is a generally young field. Surface thermostatics developed relatively early, starting with Gibbs (1948) and continuing with important contributions by many others (see Chapter 5).
Author : William Fred Adler
Publisher : ASTM International
ISBN 13 : 9780803103344
Total Pages : 668 pages
Book Rating : 4.1/5 (33 download)
Download or read book Erosion written by William Fred Adler and published by ASTM International. This book was released on 1979 with total page 668 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : A. V. Luikov
Publisher : Elsevier
ISBN 13 : 1483225682
Total Pages : 541 pages
Book Rating : 4.4/5 (832 download)
Download or read book Heat and Mass Transfer in Capillary-Porous Bodies written by A. V. Luikov and published by Elsevier. This book was released on 2014-05-12 with total page 541 pages. Available in PDF, EPUB and Kindle. Book excerpt: Heat and Mass Transfer in Capillary-Porous Bodies describes the modern theory of heat and mass transfer on the basis of the thermodynamics of irreversible processes. This book provides a systematic account of the phenomena of heat and mass transfer in capillary-porous bodies. Organized into 10 chapters, this book begins with an overview of the processes of the transfer of heat and mass of a substance. This text then examines the application of the theory to the investigation of heat and mass exchange in walls and in technological processes for the manufacture of building materials. Other chapters consider the thermal properties of building materials by using the methods of the thermodynamics of mass transfer. The final chapter deals with the method of finite differences, which is applicable to the solution of problems of non-steady heat conduction. This book is a valuable resource for scientists, post-graduate students, engineers, and students in higher educational establishments for architectural engineering.
Author : Alexander L. Yarin
Publisher : Cambridge University Press
ISBN 13 : 1107147905
Total Pages : 629 pages
Book Rating : 4.1/5 (71 download)
Download or read book Collision Phenomena in Liquids and Solids written by Alexander L. Yarin and published by Cambridge University Press. This book was released on 2017-06-15 with total page 629 pages. Available in PDF, EPUB and Kindle. Book excerpt: A unique and in-depth discussion uncovering the unifying features of collision phenomena in liquids and solids, along with applications.
Author : Rodolfo Salvi
Publisher : CRC Press
ISBN 13 : 0824744896
Total Pages : 337 pages
Book Rating : 4.8/5 (247 download)
Download or read book The Navier-Stokes Equations written by Rodolfo Salvi and published by CRC Press. This book was released on 2001-09-27 with total page 337 pages. Available in PDF, EPUB and Kindle. Book excerpt: "Contains proceedings of Varenna 2000, the international conference on theory and numerical methods of the navier-Stokes equations, held in Villa Monastero in Varenna, Lecco, Italy, surveying a wide range of topics in fluid mechanics, including compressible, incompressible, and non-newtonian fluids, the free boundary problem, and hydrodynamic potential theory."
Author : O. C. Zienkiewicz
Publisher : Butterworth-Heinemann
ISBN 13 : 9780750650557
Total Pages : 482 pages
Book Rating : 4.6/5 (55 download)
Download or read book The Finite Element Method: Solid mechanics written by O. C. Zienkiewicz and published by Butterworth-Heinemann. This book was released on 2000 with total page 482 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Nasser Ashgriz
Publisher : Springer Science & Business Media
ISBN 13 : 1441972641
Total Pages : 922 pages
Book Rating : 4.4/5 (419 download)
Download or read book Handbook of Atomization and Sprays written by Nasser Ashgriz and published by Springer Science & Business Media. This book was released on 2011-02-18 with total page 922 pages. Available in PDF, EPUB and Kindle. Book excerpt: Atomization and sprays are used in a wide range of industries: mechanical, chemical, aerospace, and civil engineering; material science and metallurgy; food; pharmaceutical, forestry, environmental protection; medicine; agriculture; meteorology and others. Some specific applications are spray combustion in furnaces, gas turbines and rockets, spray drying and cooling, air conditioning, powdered metallurgy, spray painting and coating, inhalation therapy, and many others. The Handbook of Atomization and Sprays will bring together the fundamental and applied material from all fields into one comprehensive source. Subject areas included in the reference are droplets, theoretical models and numerical simulations, phase Doppler particle analysis, applications, devices and more.
Author : Markus Bussmann
Publisher :
ISBN 13 :
Total Pages : 0 pages
Book Rating : 4.:/5 (133 download)
Download or read book A Three-dimensional Model of an Impacting Droplet written by Markus Bussmann and published by . This book was released on 2000 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: A three-dimensional model has been developed, to predict flow behaviour of a droplet impacting a solid surface. The model combines a fixed mesh discretization of the flow equations with a piecewise linear volume tracking algorithm to track the droplet free surface. Surface tension is modelled as a body force acting on fluid near the free surface. Contact angles are applied as a boundary condition at the contact line. Results are presented first of two asymmetric impacts, of a water droplet onto an incline and onto a sharp edge. Corresponding photographs are presented, of these and subsequent results. A simple model of contact angle variation with contact line velocity is proposed and implemented; simulation results compare well with the photographs. The model is then used to simulate droplet fingering and splashing, a manifestation of an unstable advancing contact line. A methodology is presented for introducing a perturbation of the velocity field near the solid surface, of prescribed amplitude and frequency, at a time shortly after impact. Simulation results are then presented of the impact of molten tin, water, and heptane droplets. Model agreement is good for a wide range of behaviours. An expression for a splashing threshold predicts the behaviour of the molten tin; the results of water and especially heptane, however, suggest that the contact angle plays an important role, and that the expression appears applicable only to impacts characterized by a relatively low value of the Weber number. The thesis concludes with application of the model to droplet impacts characteristic of the thermal spray process. First, results suggest that the splashing observed experimentally is not the result of the fluid instability under consideration here, but rather appears related to the solidification of material following impact. And finally, results are presented of the impact of thermal spray particles at various impact angles, to assess the influence of spray angle on splat geometry.
Author : Grétar Tryggvason
Publisher : Cambridge University Press
ISBN 13 : 1139496700
Total Pages : 337 pages
Book Rating : 4.1/5 (394 download)
Download or read book Direct Numerical Simulations of Gas–Liquid Multiphase Flows written by Grétar Tryggvason and published by Cambridge University Press. This book was released on 2011-03-10 with total page 337 pages. Available in PDF, EPUB and Kindle. Book excerpt: Accurately predicting the behaviour of multiphase flows is a problem of immense industrial and scientific interest. Modern computers can now study the dynamics in great detail and these simulations yield unprecedented insight. This book provides a comprehensive introduction to direct numerical simulations of multiphase flows for researchers and graduate students. After a brief overview of the context and history the authors review the governing equations. A particular emphasis is placed on the 'one-fluid' formulation where a single set of equations is used to describe the entire flow field and interface terms are included as singularity distributions. Several applications are discussed, showing how direct numerical simulations have helped researchers advance both our understanding and our ability to make predictions. The final chapter gives an overview of recent studies of flows with relatively complex physics, such as mass transfer and chemical reactions, solidification and boiling, and includes extensive references to current work.
Author : Yang Xu
Publisher :
ISBN 13 :
Total Pages : 0 pages
Book Rating : 4.:/5 (11 download)
Download or read book Normal Impact of Liquid Droplets on Smooth Solid Surfaces written by Yang Xu and published by . This book was released on 2018 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Under the framework of the LabEx Multi-Scale Modelling and Experimentation of Materials for Sustainable Construction, of Université Paris-Est Marne-La-Vallée, the present PhD thesis aims at modelling and characterizing micro-material designed by impact of molten ceramic droplets. The applications of thin coating materials are surface treatments for sustainable construction such as anti-corrosion, heat barrier, glass treatment or mechanical reinforcement of specific structures.In particular, we focus on the physics behind the liquid droplets' dynamics (the contact area and the contact time between the droplet and surface) by conducting a series of small scale multiphase flow numerical simulations with home-made code Thetis. All simulations are axisymmetric. We have considered variations of initial impact conditions, and studied the influence of inertial, capillary and viscous forces on the droplets' dynamics, especially the maximum spreading diameter, spreading time and the contact time, on solid surfaces. The code is based on Volume-Of-Fluid techniques and introduces an auxiliary smooth function to estimate the local curvature and the normal to the interface. The major reference liquid adopted are the water and the molten ceramic, the water is chosen to validate our code against available experiments at the beginning. The molten ceramic is adopted as it is widely used in thermal spray to built thermal and chemical barriers (anti-oxidant layers) as well as mechanical reinforcements on specific samples. We focus on the cases in which the surfaces are hydrophobic, even if hydrophilic cases are also considered in validation configurations for the sake of generality. Meanwhile, by introducing an energy calculation part in the code, a detailed energetic analysis of the droplet after impact is performed in both the spreading and retraction stage to have a deep understanding of the dynamics inside the droplet.We find the jetting time is inversely proportional to the impact velocity, independent of the contact angle in the early spreading. A new scaling between maximum spreading and spreading time is observed, and agrees well with experimental results. Further, we introduce this scaling into the model based on energy conservation to predict the maximum spreading factor, which provides better prediction on maximum spreading factor than existing literature references. Also a scaling of contact time is proposed in terms of Ohnesorge number and Reynolds number.
Author : Saptarshi Basu
Publisher : Springer
ISBN 13 : 9811072337
Total Pages : 386 pages
Book Rating : 4.8/5 (11 download)
Download or read book Droplet and Spray Transport: Paradigms and Applications written by Saptarshi Basu and published by Springer. This book was released on 2017-12-12 with total page 386 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book focuses on droplets and sprays and their applications. It discusses how droplet level transport is central to a multitude of applications and how droplet level manipulation and control can enhance the efficiency and design of multiphase systems. Droplets and sprays are ubiquitous in a variety of multiphase and multiscale applications in surface patterning, oil recovery, combustion, atomization, spray drying, thermal barrier coating, renewable energy, and electronic cooling, to name but a few. This book provides two levels of details pertaining to such applications. Each chapter delves into a specific application and provides not only an overview but also detailed physical insights into the application mechanism from the point of view of droplets and sprays. All chapters provide a mix of cutting-edge applications, new diagnostic techniques and modern computational methodologies, as well as the fundamental physical mechanism involved in each application. Taken together, the chapters provide a translational perspective on these applications, from basic transport processes to optimization, and from design to implementation using droplets or sprays as fundamental building blocks. Given its breadth of coverage, the book will be of interest to students, researchers, and industry professionals alike.
Author : Michael King
Publisher : John Wiley & Sons
ISBN 13 : 047057982X
Total Pages : 398 pages
Book Rating : 4.4/5 (75 download)
Download or read book Multiscale Modeling of Particle Interactions written by Michael King and published by John Wiley & Sons. This book was released on 2010-03-30 with total page 398 pages. Available in PDF, EPUB and Kindle. Book excerpt: Discover how the latest computational tools are building our understanding of particle interactions and leading to new applications With this book as their guide, readers will gain a new appreciation of the critical role that particle interactions play in advancing research and developing new applications in the biological sciences, chemical engineering, toxicology, medicine, and manufacturing technology The book explores particles ranging in size from cations to whole cells to tissues and processed materials. A focus on recreating complex, real-world dynamical systems helps readers gain a deeper understanding of cell and tissue mechanics, theoretical aspects of multiscale modeling, and the latest applications in biology and nanotechnology. Following an introductory chapter, Multiscale Modeling of Particle Interactions is divided into two parts: Part I, Applications in Nanotechnology, covers: Multiscale modeling of nanoscale aggregation phenomena: applications in semiconductor materials processing Multiscale modeling of rare events in self-assembled systems Continuum description of atomic sheets Coulombic dragging and mechanical propelling of molecules in nanofluidic systems Molecular dynamics modeling of nanodroplets and nanoparticles Modeling the interactions between compliant microcapsules and patterned surfaces Part II, Applications in Biology, covers: Coarse-grained and multiscale simulations of lipid bilayers Stochastic approach to biochemical kinetics In silico modeling of angiogenesis at multiple scales Large-scale simulation of blood flow in microvessels Molecular to multicellular deformation during adhesion of immune cells under flow Each article was contributed by one or more leading experts and pioneers in the field. All readers, from chemists and biologists to engineers and students, will gain new insights into how the latest tools in computational science can improve our understanding of particle interactions and support the development of novel applications across the broad spectrum of disciplines in biology and nanotechnology.
