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Author : Marwan Abu Al-Roub
Publisher :
ISBN 13 :
Total Pages : 624 pages
Book Rating : 4.:/5 (89 download)
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:
Author : Jeffrey D. Naber
Publisher :
ISBN 13 :
Total Pages : 660 pages
Book Rating : 4.:/5 (89 download)
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:
Author : Kathrin Schulte
Publisher : Springer Nature
ISBN 13 : 303109008X
Total Pages : 372 pages
Book Rating : 4.0/5 (31 download)
Download or read book Droplet Dynamics Under Extreme Ambient Conditions written by Kathrin Schulte and published by Springer Nature. This book was released on 2022 with total page 372 pages. Available in PDF, EPUB and Kindle. Book excerpt: This open access book presents the main results of the Collaborative Research Center SFB-TRR 75, which spanned the period from 2010 to 2022. Scientists from a variety of disciplines, ranging from thermodynamics, fluid mechanics, and electrical engineering to chemistry, mathematics, computer science, and visualization, worked together toward the overarching goal of SFB-TRR 75, to gain a deep physical understanding of fundamental droplet processes, especially those that occur under extreme ambient conditions. These are, for example, near critical thermodynamic conditions, processes at very low temperatures, under the influence of strong electric fields, or in situations with extreme gradients of boundary conditions. The fundamental understanding is a prerequisite for the prediction and optimisation of engineering systems with droplets and sprays, as well as for the prediction of droplet-related phenomena in nature. The book includes results from experimental investigations as well as new analytical and numerical descriptions on different spatial and temporal scales. The contents of the book have been organised according to methodological fundamentals, phenomena associated with free single drops, drop clusters and sprays, and drop and spray phenomena involving wall interactions.
Author : Sergei S. Sazhin
Publisher : Springer Nature
ISBN 13 : 3030997464
Total Pages : 603 pages
Book Rating : 4.0/5 (39 download)
Download or read book Droplets and Sprays: Simple Models of Complex Processes written by Sergei S. Sazhin and published by Springer Nature. This book was released on 2022-06-28 with total page 603 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book acts as a guide to simple models that describe some of the complex fluid dynamics, heat/mass transfer and combustion processes in droplets and sprays. Attention is focused mainly on the use of classical hydrodynamics, and a combination of kinetic and hydrodynamic models, to analyse the heating and evaporation of mono- and multi-component droplets. The models were developed for cases when small and large numbers of components are present in droplets. Some of these models are used for the prediction of time to puffing/micro-explosion of composite water/fuel droplets — processes that are widely used in combustion devices to stimulate disintegration of relatively large droplets into smaller ones. The predictions of numerical codes based on these models are validated against experimental results where possible. In most of the models, droplets are assumed to be spherical; some preliminary results of the generalisation of these models to the case of non-spherical droplets, approximating them as spheroids, are presented.
Author : Jenn-Sheng Chen
Publisher :
ISBN 13 :
Total Pages : 354 pages
Book Rating : 4.:/5 (224 download)
Download or read book Numerical Study on Hydrodynamics and Heat Transfer of Droplet Arrays at Intermediate Reynolds Numbers written by Jenn-Sheng Chen and published by . This book was released on 1988 with total page 354 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Alireza Gholijani
Publisher :
ISBN 13 :
Total Pages : 0 pages
Book Rating : 4.:/5 (137 download)
Download or read book Experimental Investigation of Fluid Dynamics and Heat Transport During Single and Multiple Drop Impingement Onto a Superheated Wall written by Alireza Gholijani and published by . This book was released on 2023 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : David Brutin
Publisher : Academic Press
ISBN 13 : 0128008083
Total Pages : 464 pages
Book Rating : 4.1/5 (28 download)
Download or read book Droplet Wetting and Evaporation written by David Brutin and published by Academic Press. This book was released on 2015-05-11 with total page 464 pages. Available in PDF, EPUB and Kindle. Book excerpt: Droplet Wetting and Evaporation provides engineers, students, and researchers with the first comprehensive guide to the theory and applications of droplet wetting and evaporation. Beginning with a relevant theoretical background, the book moves on to consider specific aspects, including heat transfer, flow instabilities, and the drying of complex fluid droplets. Each chapter covers the principles of the subject, addressing corresponding practical issues and problems. The text is ideal for a broad range of domains, from aerospace and materials, to biomedical applications, comprehensively relaying the challenges and approaches from the different communities leading the way in droplet research and development. Provides a broad, cross-subject coverage of theory and application that is ideal for engineers, students and researchers who need to follow all major developments in this interdisciplinary field Includes comprehensive discussions of heat transfer, flow instabilities, and the drying of complex fluid droplets Begins with an accessible summary of fundamental theory before moving on to specific areas such as heat transfer, flow instabilities, and the drying of complex fluid droplets
Author : Martin Rein
Publisher : Springer Science & Business Media
ISBN 13 : 9783211836927
Total Pages : 328 pages
Book Rating : 4.8/5 (369 download)
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.
Author : S. Mostafa Ghiaasiaan
Publisher : Cambridge University Press
ISBN 13 : 1316785300
Total Pages : 1322 pages
Book Rating : 4.3/5 (167 download)
Download or read book Two-Phase Flow, Boiling, and Condensation written by S. Mostafa Ghiaasiaan and published by Cambridge University Press. This book was released on 2017-01-11 with total page 1322 pages. Available in PDF, EPUB and Kindle. Book excerpt: Providing a comprehensive introduction to the fundamentals and applications of flow and heat transfer in conventional and miniature systems, this fully enhanced and updated edition covers all the topics essential for graduate courses on two-phase flow, boiling, and condensation. Beginning with a concise review of single-phase flow fundamentals and interfacial phenomena, detailed and clear discussion is provided on a range of topics, including two-phase hydrodynamics and flow regimes, mathematical modeling of gas-liquid two-phase flows, pool and flow boiling, flow and boiling in mini and microchannels, external and internal-flow condensation with and without noncondensables, condensation in small flow passages, and two-phase choked flow. Numerous solved examples and end-of-chapter problems that include many common design problems likely to be encountered by students, make this an essential text for graduate students. With up-to-date detail on the most recent research trends and practical applications, it is also an ideal reference for professionals and researchers in mechanical, nuclear, and chemical engineering.
Author : Xiangda Cui
Publisher :
ISBN 13 :
Total Pages : pages
Book Rating : 4.:/5 (129 download)
Download or read book Multiphase Smoothed Particle Hydrodynamics Modeling of Supercooled Large Droplets Impingement and Solidification at In-flight Icing Conditions written by Xiangda Cui and published by . This book was released on 2021 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: "Encounters with Supercooled Large Droplets (SLD) pose a danger to aircraft, as they can cause ice accretion beyond the reach of ice protection systems. In-flight icing effects must meet the regulations of airworthiness authorities in order for a new class of aircraft to obtain a type certification. Since flights into natural icing conditions and wind/icing tunnel tests cannot fully explore the SLD icing envelope, Computational Fluid Dynamics (CFD) has become an indispensable tool for assessing in-flight icing effects. However, the SLD modules of such in-flight icing simulation codes rely on empirical data or extrapolation from low-speed experiments. This thesis aims to develop a multiphase Smoothed Particle Hydrodynamics (SPH) solver for conducting "numerical experiments" of SLD impingement at flight speeds, to ultimately yield a macroscopic SLD model that can be embedded into in-flight icing simulation codes.SPH is a mesh-free CFD method suitable for SLD problems as it can handle complex interfaces and model multi-phase physics. In the multiphase SPH framework presented here, the inviscid momentum and energy equations are solved for flow and heat transfer, along with an equation of state linking pressure and density. A multiphase model is used to represent interfacial flows, and a fixed ghost particle method to enforce boundary conditions. Artificial viscous and diffusive terms are employed to smooth physical fields and decrease numerical instability, while a particle shifting technique is used to alleviate anisotropic particle distribution. Several numerical techniques are proposed to model the complex physics of SLD impingement such as a contact angle model to represent the non-wetting properties of hydrophobic surfaces, a latent heat model to account for phase change and a supercooled solidification model to capture dendritic freezing. The solver is validated against a series of experimental results, showing good agreement. It is then first applied to droplets impinging at flight speeds on a water film to study the effects on the post-impact water crown of droplet speed and diameter, surface tension, water film thickness, and impact angle. Droplets impacting on cold solid surfaces are then simulated to study freezing time and post-impact ice particle distribution for a range of speeds and impact angles. Following this, an improved contact angle model is used to study the interaction between droplets and hydrophobic/superhydrophobic coatings. Finally, SLD impinging on ice surfaces are studied via a supercooled solidification model, with supercooling degree and impact speed effects on residual ice analyzed. This thesis thus develops an SPH numerical framework capable of simulating SLD impingement and solidification at in-flight icing conditions. It provides a toolset for comprehensive parametric studies of SLD impingement, paving the way for a macroscopic SLD model for in-flight icing simulation codes"--
Author :
Publisher : Academic Press
ISBN 13 : 0323989802
Total Pages : 302 pages
Book Rating : 4.3/5 (239 download)
Download or read book Advances in Heat Transfer written by and published by Academic Press. This book was released on 2022-10-21 with total page 302 pages. Available in PDF, EPUB and Kindle. Book excerpt: Advances in Heat Transfer, Volume 54 in this comprehensive series, highlights new advances in the field, with this new volume presenting interesting chapter written by an international board of authors. Updates to this new release include chapters on Thermal Convection Studies at the University of Minnesota and Turbulent passive scalar transport in smooth wall-bounded flows: recent advances. Includes the authority and expertise of leading contributors from an international board of authors Presents the latest release in Advances in Heat Transfer series Provides a comprehensive approach, highlighting new advances in the field
Author : Xin Gu
Publisher :
ISBN 13 :
Total Pages : 95 pages
Book Rating : 4.:/5 (643 download)
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.
Author : Saangrut Sangplung
Publisher :
ISBN 13 :
Total Pages : 150 pages
Book Rating : 4.:/5 (173 download)
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.
Author : Aqeel Jaffar Zaidi
Publisher :
ISBN 13 :
Total Pages : 654 pages
Book Rating : 4.:/5 (184 download)
Download or read book Hydrodynamics and Heat Transfer in Two-phase Two-component Flow in a Vertical Tube written by Aqeel Jaffar Zaidi and published by . This book was released on 1981 with total page 654 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Rajneesh Bhardwaj
Publisher :
ISBN 13 : 9781449972141
Total Pages : 176 pages
Book Rating : 4.9/5 (721 download)
Download or read book An Investigation of the Evaporation of a Droplet on a Solid Surface: Evaporation, Self-Assembly of Colloidal Deposits, and Interfacial Heat Transfer written by Rajneesh Bhardwaj and published by . This book was released on 2010-02-01 with total page 176 pages. Available in PDF, EPUB and Kindle. Book excerpt: The high, fast and local heat transfer associated with the deposition and evaporation of a single droplet on a flat surface has potential applications in spray evaporative cooling. Controlled evaporation of microdroplets containing colloidal particles can be used to manufacture nanowires, explosive crystalline layers and DNA spots for gene expression analysis. The physics of this phenomenon is a complex interplay of fluid dynamics in presence of a severely deforming free surface, wetting line motion, convective and conductive heat transfer, mass transfer due to evaporation and advection-diffusion of particles inside the droplet. In this book, Rajneesh Bhardwaj proposes a numerical modeling to investigate the interplay of transport phenomena during droplet impact and evaporation, for the case of a pure liquid or a colloidal solution. Comparions of numerical results with available or in-house experiments are made wherever possible.
Author : Richard A. Booth
Publisher :
ISBN 13 :
Total Pages : 308 pages
Book Rating : 4.:/5 (89 download)
Download or read book Investigation of Impinged Diesel Spray Hydrodynamics and Heat Transfer written by Richard A. Booth and published by . This book was released on 1994 with total page 308 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Chengbin Zhang
Publisher : Frontiers Media SA
ISBN 13 : 2832507484
Total Pages : 89 pages
Book Rating : 4.8/5 (325 download)
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:
