Author: Sushrutha Reddy Gujjula Publisher: ISBN: Category : Languages : en Pages : 63
Book Description
The present study of droplet spreading has many industrial applications of which, ink jet printing, plasma spraying, fire extinguishers are but a few. These applications need a detailed and fundamental understanding of the droplet spreading physics, which is divided into four phases. In the present work, two of these phases, namely, the spreading phase, and equilibrium phase have been analyzed. Since droplet spreading is a dynamic phenomenon where the surface of the droplet changes with time, capturing these changes requires a two-phase approach called volume of fluid (VOF) method. The VOF method uses an advection equation to determine the interface between the liquid and the surrounding air. At the intersection of this interface with a solid boundary is a point common to all three phases, solid, gas, and liquid. At the liquid-solid-gas contact point, contact-angle is the angle between the solid surface and the tangent to the liquid-gas interface, the contact-angle can also vary with time. A number of contact-angle models have been proposed and used in simulations of droplet spreading research reported in literature. The present study is a systematic analysis of the most widely used contact-angle models, which include both, static and dynamic contact-angle models, on surfaces with varying wettability, i.e. hydrophilic and hydrophobic surfaces. To compile the contact-angle models, an open source code, OpenFOAM was used. Results from simulations are presented and compared with those from experiments, conducted by Pasandideh Fard et al. [21] and Vadillo et al. [26]. In addition, two parameters, called the maximum spreading diameter, and the equilibrium spreading diameter, were also analyzed in detail. The results indicated that, using the static contact angle models over-predicted the maximum spreading diameter for the hydrophilic case, whereas the equilibrium spreading diameter was under-predicted. In case of the hydrophobic surface, the maximum spreading diameter was predicted well, but the equilibrium spreading diameter was slightly under-predicted. Simulations using the dynamically varying contact angles with respect to empirical correlations and theoretical expressions slightly under-predicted the overall trend of the spreading diameter. But observations of the maximum and equilibrium diameters were predicted better. Using the experimentally measured contact-angle values as a boundary condition in the simulations improved the dynamic spreading diameter prediction.
Author: Martin Rein Publisher: Springer Science & Business Media ISBN: 9783211836927 Category : Computers Languages : en Pages : 328
Book Description
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: Sangchul Lee Publisher: Springer Nature ISBN: 9811926891 Category : Technology & Engineering Languages : en Pages : 1027
Book Description
This proceeding comprises peer-reviewed papers of the 2021 Asia-Pacific International Symposium on Aerospace Technology (APISAT 2021), held from 15-17 November 2021 in Jeju, South Korea. This book deals with various themes on computational fluid dynamics, wind tunnel testing, flow visualization, UAV design, flight simulation, satellite attitude control, aeroelasticity and control, combustion analysis, fuel injection, cooling systems, spacecraft propulsion and so forth. So, this book can be very helpful not only for the researchers of universities and academic institutes, but also for the industry engineers who are interested in the current and future advanced topics in aerospace technology.
Author: Giovanni P Galdi Publisher: Springer ISBN: 9781493950171 Category : Languages : en Pages : 1034
Book Description
The book provides a comprehensive, detailed and self-contained treatment of the fundamental mathematical properties of boundary-value problems related to the Navier-Stokes equations. These properties include existence, uniqueness and regularity of solutions in bounded as well as unbounded domains. Whenever the domain is unbounded, the asymptotic behavior of solutions is also investigated. This book is the new edition of the original two volume book, under the same title, published in 1994. In this new edition, the two volumes have merged into one and two more chapters on steady generalized oseen flow in exterior domains and steady Navier Stokes flow in three-dimensional exterior domains have been added. Most of the proofs given in the previous edition were also updated. An introductory first chapter describes all relevant questions treated in the book and lists and motivates a number of significant and still open questions. It is written in an expository style so as to be accessible also to non-specialists. Each chapter is preceded by a substantial, preliminary discussion of the problems treated, along with their motivation and the strategy used to solve them. Also, each chapter ends with a section dedicated to alternative approaches and procedures, as well as historical notes. The book contains more than 400 stimulating exercises, at different levels of difficulty, that will help the junior researcher and the graduate student to gradually become accustomed with the subject. Finally, the book is endowed with a vast bibliography that includes more than 500 items. Each item brings a reference to the section of the book where it is cited. The book will be useful to researchers and graduate students in mathematics in particular mathematical fluid mechanics and differential equations. Review of First Edition, First Volume: The emphasis of this book is on an introduction to the mathematical theory of the stationary Navier-Stokes equations. It is written in the style of a textbook and is essentially self-contained. The problems are presented clearly and in an accessible manner. Every chapter begins with a good introductory discussion of the problems considered, and ends with interesting notes on different approaches developed in the literature. Further, stimulating exercises are proposed. (Mathematical Reviews, 1995) "
Author: C. Anandharamakrishnan Publisher: John Wiley & Sons ISBN: 1118930517 Category : Technology & Engineering Languages : en Pages : 340
Book Description
Handbook of Drying for Dairy Products is a complete guide to the field’s principles and applications, with an emphasis on best practices for the creation and preservation of dairy-based food ingredients. Details the techniques and results of drum drying, spray drying, freeze drying, spray-freeze drying, and hybrid drying Contains the most up-to-date research for optimizing the drying of dairy, as well as computer modelling options Addresses the effect of different drying techniques on the nutritional profile of dairy products Provides essential information for dairy science academics as well as technologists active in the dairy industry
Author: Qingzhou Xu Publisher: World Scientific ISBN: 9813200480 Category : Technology & Engineering Languages : en Pages : 535
Book Description
The 2016 International Conference on Advanced Materials, Technology and Application (AMTA2016) was held in Changsha, China on March 18-20, 2016. The main objective of the joint conference is to provide a platform for researchers, academics and industrial professionals to present their research findings in the fields of advanced materials and technology.The AMTA2016 received more than 150 submissions, but only 59 articles were selected to be included in this proceedings, which are organized into 7 chapters; covering Chemical Materials, composite and Nano Materials, Polymer and Concrete Materials, Structural Materials, Metal and Alloy Materials, Electrical Materials, and Biomaterials.
Author: National Academies of Sciences, Engineering, and Medicine Publisher: National Academies Press ISBN: 030949382X Category : Medical Languages : en Pages : 291
Book Description
Legionnaires' disease, a pneumonia caused by the Legionella bacterium, is the leading cause of reported waterborne disease outbreaks in the United States. Legionella occur naturally in water from many different environmental sources, but grow rapidly in the warm, stagnant conditions that can be found in engineered water systems such as cooling towers, building plumbing, and hot tubs. Humans are primarily exposed to Legionella through inhalation of contaminated aerosols into the respiratory system. Legionnaires' disease can be fatal, with between 3 and 33 percent of Legionella infections leading to death, and studies show the incidence of Legionnaires' disease in the United States increased five-fold from 2000 to 2017. Management of Legionella in Water Systems reviews the state of science on Legionella contamination of water systems, specifically the ecology and diagnosis. This report explores the process of transmission via water systems, quantification, prevention and control, and policy and training issues that affect the incidence of Legionnaires' disease. It also analyzes existing knowledge gaps and recommends research priorities moving forward.
Author: Sushrutha Reddy Gujjula
Author: Mohammed Abushamleh
Author: K. Al-Badani
Author: Martin Rein
Author: Dudley Brian Spalding
Author: Sangchul Lee
Author: Giovanni P Galdi
Author: C. Anandharamakrishnan
Author: Qingzhou Xu
Author: National Academies of Sciences, Engineering, and Medicine