Study Of The Hydrodynamics Of Droplet Impingement On A Dry Surface Using Lattice Boltzmann Method

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Study of the Hydrodynamics of Droplet Impingement on a Dry Surface Using Lattice Boltzmann Method

Author : Xin Gu
Publisher :
ISBN 13 :
Total Pages : 95 pages
Book Rating : 4.:/5 (643 download)

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Book Synopsis Study of the Hydrodynamics of Droplet Impingement on a Dry Surface Using Lattice Boltzmann Method by : Xin Gu

Download or read book Study of the Hydrodynamics of Droplet Impingement on a Dry Surface Using Lattice Boltzmann Method written by Xin Gu and published by . This book was released on 2009 with total page 95 pages. Available in PDF, EPUB and Kindle. Book excerpt: In this work, a two-phase lattice Boltzmann method (LBM) approach is implemented to investigate the hydrodynamic behavior of a single droplet impingement on a dry surface. LBM is a recently developed powerful technique to compute a wide range of fluid flow problems, especially in applications involving interfacial dynamics and complex geometries. Instead of solving the non-linear Navier-Stokes equations, which are complicated partial differential equations, LBM solves a set of discretized linear equations, which are easy to implement and parallelize. The fundamental idea of LBM is to recover the macroscopic properties of the fluid which obeys Navier-Stokes equations, by using simplified kinetic equations that incorporate the essential physics at the microscopic level. Considering the numerical instability induced by large density difference between two phases during the LBM simulations, the particular LBM scheme used in this study has its benefits when dealing with high density ratios. All the simulations are conducted for density ratio up to 50 in a three-dimensional Cartesian coordinate system, and three important dimensionless numbers, namely Weber number, Reynolds number and Ohnesorge number, are used for this study. To validate this multiphase LBM approach, several benchmark tests are conducted. First, the angular frequency of an oscillating droplet is calculated and compared with the corresponding theoretical value. Errors are found to be within 6.1% for all the cases. Secondly, simulations of binary droplet collisions are conducted in the range of 20[less than]We[less than]80. Three different types of outcome, namely coalescence collision, separating collision and stretching collision, are presented. Then, the normal impact of a liquid drop impinging on a smooth dry surface is simulated at various liquid Weber and Reynolds numbers. A novel wall boundary condition is implemented in order to study the effects of wetting characteristic of the impinging surface. Results are shown to compare the spread factor dependence on impact velocity, liquid density, liquid viscosity, surface tension and surface wetting characteristics. The results are validated with experimental data. Two different outcomes are obtained: deposition and splashing break-up. The transition to splashing is found to be dependent on the liquid Weber and Reynolds numbers.

Numerical Study of Droplet Formation with Nozzle Dynamics and Multiple Droplet Impingement

Author : Saangrut Sangplung
Publisher :
ISBN 13 :
Total Pages : 150 pages
Book Rating : 4.:/5 (173 download)

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Book Synopsis Numerical Study of Droplet Formation with Nozzle Dynamics and Multiple Droplet Impingement by : Saangrut Sangplung

Download or read book Numerical Study of Droplet Formation with Nozzle Dynamics and Multiple Droplet Impingement written by Saangrut Sangplung and published by . This book was released on 2008 with total page 150 pages. Available in PDF, EPUB and Kindle. Book excerpt: Droplet formation from a flexible nozzle plate driven by a prescribed-waveform excitation of a piezoelectric is numerically investigated using a computational fluid dynamics (CFD) model with the VOF method. The droplet generator with a flexible nozzle plate, which is free to vibrate due to the pressure acting on the plate, is modeled in a computational domain. The CFD analysis includes the fluid-structure interaction between fluid and a flexible plate using large deflection theory. The problem is characterized by the nondimensional variables based on the capillary parameters of time, velocity, and pressure. The CFD model is validated with experiment results. This study examines the characteristics of the applied waveforms and nozzle plate material properties to change the vibrational characteristics of the nozzle plate. The effect of fluid properties on the droplet formation process is also investigated focusing on surface tension and viscous forces. The mechanism of the droplet formation excited by a drop-on-demand piezoelectric waveform is investigated using a step-function and a pulse waveform. The piezoelectric displacement plays an important role in generating either forward-driven momentum or a suction pressure inside the chamber. For the step-function waveform, the nondimensional applied impulse is defined and used to characterize the post-breakoff droplet volume. Increasing the impulse of the piezoelectric can be used to cause a faster droplet velocity and it is shown that the vibration of the nozzle plate has a strong effect on the droplet velocity, shape, and volume. Surface tension has strong influence on the droplet formation characteristics which is in contrast to a viscous force that makes little difference on the droplet formation for a range of viscosities studied. For the combination of a fluid with high surface tension and the most flexible nozzle plate, this system can cause the droplet not to be ejected from the nozzle. Successive droplet impingement onto a solid surface is numerically investigated using a CFD multiphase flow model (VOF method). The main focus of this study is to better understand the hydrodynamics of the non-splash impingement process, particularly the effect of a dynamic contact angle and fluid properties along with the interaction between successive droplets while they are impinging onto a solid surface. The pre-impact droplet conditions are prescribed based on a spherical droplet diameter, velocity, and inter-droplet spacing. The molecular kinetic theory is used to model the dynamic contact angle as a function of a contact line velocity. The numerical scheme is validated against experiment al results. In the impact spreading and receding processes, results are analyzed to determine the nondimensional deformation characteristics of both single and successive droplet impingements with the variation of fluid properties such as surface tension and dynamic viscosity. These characteristics include spreading ratio, spreading velocity, and a dynamic contact angle. The inclusion of a dynamic contact angle is shown to have a major effect on droplet spreading. In successive droplet impingement, the second drop causes a surge of spreading velocity and contact angle with an associate complex recirculating flow near the contact line after it initially impacts the preceding droplet when it is in an advancing condition. This interaction is less dramatic when the first drop is receding or stationary. The surface tension has the most effect on the maximum spreading radius in both single and successive droplet impingements. In contrast to this, the viscosity directly affects the damping of the spreading-receding process.

Dynamics of Droplets

Author : Arnold Frohn
Publisher : Springer Science & Business Media
ISBN 13 : 9783540658870
Total Pages : 308 pages
Book Rating : 4.6/5 (588 download)

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Book Synopsis Dynamics of Droplets by : Arnold Frohn

Download or read book Dynamics of Droplets written by Arnold Frohn and published by Springer Science & Business Media. This book was released on 2000-03-27 with total page 308 pages. Available in PDF, EPUB and Kindle. Book excerpt: The book deals with the dynamical behaviour of single droplets and regular droplet systems. After a short description of the theoretical background, the different experimental facilities and methods necessary for the investigation of single droplets are described in detail. A summary of important applications is included.

Droplet Impingement on a Heated Surface

Author : Jeffrey D. Naber
Publisher :
ISBN 13 :
Total Pages : 660 pages
Book Rating : 4.:/5 (89 download)

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Book Synopsis Droplet Impingement on a Heated Surface by : Jeffrey D. Naber

Download or read book Droplet Impingement on a Heated Surface written by Jeffrey D. Naber and published by . This book was released on 1992 with total page 660 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Hydrodynamics and Heat Transfer of Multiple Droplet Impingement

Author : Marwan Abu Al-Roub
Publisher :
ISBN 13 :
Total Pages : 624 pages
Book Rating : 4.:/5 (89 download)

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Book Synopsis Hydrodynamics and Heat Transfer of Multiple Droplet Impingement by : Marwan Abu Al-Roub

Download or read book Hydrodynamics and Heat Transfer of Multiple Droplet Impingement written by Marwan Abu Al-Roub and published by . This book was released on 1996 with total page 624 pages. Available in PDF, EPUB and Kindle. Book excerpt:

High Value Manufacturing: Advanced Research in Virtual and Rapid Prototyping

Author : Maria K. Todd
Publisher : CRC Press
ISBN 13 : 1315817411
Total Pages : 650 pages
Book Rating : 4.3/5 (158 download)

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Book Synopsis High Value Manufacturing: Advanced Research in Virtual and Rapid Prototyping by : Maria K. Todd

Download or read book High Value Manufacturing: Advanced Research in Virtual and Rapid Prototyping written by Maria K. Todd and published by CRC Press. This book was released on 2013-09-16 with total page 650 pages. Available in PDF, EPUB and Kindle. Book excerpt: High Value Manufacturing is the result of the 6th International Conference on Advanced Research in Virtual and Rapid Prototyping, held in Leiria, Portugal, October 2013. It contains current contributions to the field of virtual and rapid prototyping (V&RP) and is also focused on promoting better links between industry and academia. This volume

Heat transfer in data centers, volume II

Author : Chengbin Zhang
Publisher : Frontiers Media SA
ISBN 13 : 2832507484
Total Pages : 89 pages
Book Rating : 4.8/5 (325 download)

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Book Synopsis Heat transfer in data centers, volume II by : Chengbin Zhang

Download or read book Heat transfer in data centers, volume II written by Chengbin Zhang and published by Frontiers Media SA. This book was released on 2023-03-24 with total page 89 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Prediction of Droplet Dynamics on Solid Surface by the Lattice Boltzmann Method

Author : Mohd. Zamri Ibrahim
Publisher :
ISBN 13 :
Total Pages : 67 pages
Book Rating : 4.:/5 (96 download)

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Book Synopsis Prediction of Droplet Dynamics on Solid Surface by the Lattice Boltzmann Method by : Mohd. Zamri Ibrahim

Download or read book Prediction of Droplet Dynamics on Solid Surface by the Lattice Boltzmann Method written by Mohd. Zamri Ibrahim and published by . This book was released on 2011 with total page 67 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Simulation of Liquid Droplet in Air and on a Solid Surface

Author : Kevin Launglucknavalai
Publisher :
ISBN 13 : 9781303065484
Total Pages : 64 pages
Book Rating : 4.0/5 (654 download)

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Book Synopsis Simulation of Liquid Droplet in Air and on a Solid Surface by : Kevin Launglucknavalai

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.

Simulations of Droplet Interactions with Lattice Boltzmann Methods

Author : Orest Shardt
Publisher :
ISBN 13 :
Total Pages : 134 pages
Book Rating : 4.:/5 (92 download)

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Book Synopsis Simulations of Droplet Interactions with Lattice Boltzmann Methods by : Orest Shardt

Download or read book Simulations of Droplet Interactions with Lattice Boltzmann Methods written by Orest Shardt and published by . This book was released on 2014 with total page 134 pages. Available in PDF, EPUB and Kindle. Book excerpt: Interactions between droplets were studied using two lattice Boltzmann methods (LBMs). The Shan-Chen LBM, in which repulsive forces between fluids maintain phase separation, was used to simulate systems with three immiscible components. The simulations demonstrated the three equilibrium configurations of two droplets in a third fluid: adhering, separated, and engulfed. Simulations of adhering droplet pairs, called Janus droplets due to their two-sided structure, in shear flow revealed the structure of the internal flow and the dependence of the rotation rate on the orientation of the droplet. A second type of interaction between droplets was simulated with the free-energy binary-liquid LBM: binary droplet collisions in confined simple shear flow. The conditions for coalescence were quantified and the effects of geometry and the parameters of this Cahn-Hilliard-type phase field model on the critical conditions were examined. Two parameters of the phase field model, the thickness of the diffuse interface and the mobility of the phase field, are important. Simulations with highly-resolved droplets, with radii spanning 200 lattice nodes, were used to determine the minimum film thickness before coalescence, its relationship to the interface thickness, and the effect of the mobility on the evolution of the minimum distance between the droplet interfaces during collisions. The critical conditions for coalescence in these simulations were compared with published experiments with polymers. Unlike the experimental polymer system, the interfaces of interacting droplets are often charged, as in the case of oil-water emulsions. To simulate such liquid systems, the free-energy binary-liquid LBM was coupled with an iterative finite difference solver for the linearized Poisson-Boltzmann equation that describes the electrostatic potential near a charged surface in an electrolyte solution. Simulations of collisions between charged droplets with constant zeta potentials in a sheared electrolyte showed the effects of surface charge on the critical conditions for coalescence.

Handbook of Atomization and Sprays

Author : Nasser Ashgriz
Publisher : Springer Science & Business Media
ISBN 13 : 1441972641
Total Pages : 922 pages
Book Rating : 4.4/5 (419 download)

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Book Synopsis Handbook of Atomization and Sprays by : Nasser Ashgriz

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.

Drop-Surface Interactions

Author : Martin Rein
Publisher : Springer Science & Business Media
ISBN 13 : 9783211836927
Total Pages : 328 pages
Book Rating : 4.8/5 (369 download)

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Book Synopsis Drop-Surface Interactions by : Martin Rein

Download or read book Drop-Surface Interactions written by Martin Rein and published by Springer Science & Business Media. This book was released on 2002-10-30 with total page 328 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.

Particle Breakage

Author : Agba D. Salman
Publisher : Elsevier Science Limited
ISBN 13 : 9780444530806
Total Pages : 1227 pages
Book Rating : 4.5/5 (38 download)

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Book Synopsis Particle Breakage by : Agba D. Salman

Download or read book Particle Breakage written by Agba D. Salman and published by Elsevier Science Limited. This book was released on 2007 with total page 1227 pages. Available in PDF, EPUB and Kindle. Book excerpt: Gives an understanding of the state-of-the-art, and access to a wide range of principles. An academic outlook, blended with an industrial perspective!

Collision Phenomena in Liquids and Solids

Author : Alexander L. Yarin
Publisher : Cambridge University Press
ISBN 13 : 1107147905
Total Pages : 629 pages
Book Rating : 4.1/5 (71 download)

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Book Synopsis Collision Phenomena in Liquids and Solids by : Alexander L. Yarin

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.

Multiphase Lattice Boltzmann Methods

Author : Haibo Huang
Publisher : John Wiley & Sons
ISBN 13 : 1118971442
Total Pages : 392 pages
Book Rating : 4.1/5 (189 download)

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Book Synopsis Multiphase Lattice Boltzmann Methods by : Haibo Huang

Download or read book Multiphase Lattice Boltzmann Methods written by Haibo Huang and published by John Wiley & Sons. This book was released on 2015-06-08 with total page 392 pages. Available in PDF, EPUB and Kindle. Book excerpt: Theory and Application of Multiphase Lattice Boltzmann Methods presents a comprehensive review of all popular multiphase Lattice Boltzmann Methods developed thus far and is aimed at researchers and practitioners within relevant Earth Science disciplines as well as Petroleum, Chemical, Mechanical and Geological Engineering. Clearly structured throughout, this book will be an invaluable reference on the current state of all popular multiphase Lattice Boltzmann Methods (LBMs). The advantages and disadvantages of each model are presented in an accessible manner to enable the reader to choose the model most suitable for the problems they are interested in. The book is targeted at graduate students and researchers who plan to investigate multiphase flows using LBMs. Throughout the text most of the popular multiphase LBMs are analyzed both theoretically and through numerical simulation. The authors present many of the mathematical derivations of the models in greater detail than is currently found in the existing literature. The approach to understanding and classifying the various models is principally based on simulation compared against analytical and observational results and discovery of undesirable terms in the derived macroscopic equations and sometimes their correction. A repository of FORTRAN codes for multiphase LBM models is also provided.

Process Intensification

Author : David Reay
Publisher : Butterworth-Heinemann
ISBN 13 : 0080983057
Total Pages : 624 pages
Book Rating : 4.0/5 (89 download)

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Book Synopsis Process Intensification by : David Reay

Download or read book Process Intensification written by David Reay and published by Butterworth-Heinemann. This book was released on 2013-06-05 with total page 624 pages. Available in PDF, EPUB and Kindle. Book excerpt: Process Intensification: Engineering for Efficiency, Sustainability and Flexibility is the first book to provide a practical working guide to understanding process intensification (PI) and developing successful PI solutions and applications in chemical process, civil, environmental, energy, pharmaceutical, biological, and biochemical systems. Process intensification is a chemical and process design approach that leads to substantially smaller, cleaner, safer, and more energy efficient process technology. It improves process flexibility, product quality, speed to market and inherent safety, with a reduced environmental footprint. This book represents a valuable resource for engineers working with leading-edge process technologies, and those involved research and development of chemical, process, environmental, pharmaceutical, and bioscience systems. No other reference covers both the technology and application of PI, addressing fundamentals, industry applications, and including a development and implementation guide Covers hot and high growth topics, including emission prevention, sustainable design, and pinch analysis World-class authors: Colin Ramshaw pioneered PI at ICI and is widely credited as the father of the technology

Capillary Flows with Forming Interfaces

Author : Yulii D. Shikhmurzaev
Publisher : CRC Press
ISBN 13 : 1584887494
Total Pages : 478 pages
Book Rating : 4.5/5 (848 download)

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Book Synopsis Capillary Flows with Forming Interfaces by : Yulii D. Shikhmurzaev

Download or read book Capillary Flows with Forming Interfaces written by Yulii D. Shikhmurzaev and published by CRC Press. This book was released on 2007-09-14 with total page 478 pages. Available in PDF, EPUB and Kindle. Book excerpt: Capillary Flows with Forming Interfaces explores numerous theoretical problems that arise in the mathematical description of capillary flows. It focuses on developing a unified approach to a variety of seemingly very different capillary flows of practical importance where classical fluid mechanics leads to nonphysical results. The book begin