Download or read book Efficient Liquid Atomization Using Gas Flows and Novel Micro machining Techniques written by Herman Emil Snyder and published by . This book was released on 1997 with total page 776 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Liquid Atomization written by L.P. Bayvel and published by Routledge. This book was released on 2019-01-22 with total page 488 pages. Available in PDF, EPUB and Kindle. Book excerpt: Covering the basics of liquid atomization, this book familiarizes readers with the physical processes of liquid atomization, the main types of atomizers and their design, measurements of spray characteristics, experimental investigations of atomizers, and application of atomizers. It demonstrates how to calculate and design atomizers and how to mea
Download or read book Atomization and Sprays written by Arthur Lefebvre and published by CRC Press. This book was released on 1988-12-01 with total page 434 pages. Available in PDF, EPUB and Kindle. Book excerpt: Atomization and Sprays examines the atomization of liquids and characteristics of sprays. It explains the physical processes of atomization as well as guidelines for designing atomizers. In addition, it demonstrates how the importance of the size and velocity of a particle contributes to improved spray characterization. Coverage includes general co
Download or read book Industrial Sprays and Atomization written by Ghasem G. Nasr and published by Springer Science & Business Media. This book was released on 2013-04-17 with total page 515 pages. Available in PDF, EPUB and Kindle. Book excerpt: An extensive critical compilation of the wide range of manufacturing processes that involve the application of spray technology, this book covers design of atomizers as well as the performance of plant and their corresponding spray systems. The needs of practising engineers from different disciplines: project managers, and works, maintenance and design engineers are catered for. Of interest to researchers in the field of liquid sprays, the book includes outlines of the contemporary and possible future research and challenges in the different fields of application and deals with: • sprays and their production; • sprays in industrial production processes; • processes involving vaporisation and cooling or cleaning of gases; • spray-surface impact processes; • fuel sprays for fixed plant; • spraying of hot surfaces for steel making and other metals; • spraying of molten metals. Guidance is given for the analysis and interpretation of experimental data obtained using different measurement techniques.
Download or read book Development of Micro diesel Injector Nozzles Via Mems Technology and Effects on Spray Characteristics written by Seunghyun Baik and published by . This book was released on 2001 with total page 168 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Journal of Engineering for Gas Turbines and Power written by and published by . This book was released on 2003 with total page 628 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Atomization and Sprays written by Arthur H. Lefebvre and published by CRC Press. This book was released on 2017-03-27 with total page 284 pages. Available in PDF, EPUB and Kindle. Book excerpt: The second edition of this long-time bestseller provides a framework for designing and understanding sprays for a wide array of engineering applications. The text contains correlations and design tools that can be easily understood and used in relating the design of atomizers to the resulting spray behavior. Written to be accessible to readers with a modest technical background, the emphasis is on application rather than in-depth theory. Numerous examples are provided to serve as starting points for using the information in the book. Overall, this is a thoroughly updated edition that still retains the practical focus and readability of the original work by Arthur Lefebvre.
Download or read book Multi scale Modeling and Control of Liquid gas Flows with a Focus on Spray Atomization written by Lam Xuan Vu and published by . This book was released on 2022 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: In the context of the climate crisis, fuel sprays are of great societal importance because they directly impact energy consumption and pollutant emissions in liquid-fueled combustion systems. More broadly, liquid sprays appear in a wide range of applications such as powder production for additive manufacturing, drug encapsulation, and coatings for materials. Because of their importance and ubiquity, there is a strong desire to better model the spray atomization process and to develop optimization and control strategies to improve efficiency and to aid in the design of spray systems. However, computational modeling of atomization presents enormous challenges, in part because the extreme complexity of the associated flow field and because of the wide range of length and time scales involved. In the first part of this work, I present a multi-scale simulation strategy that models the full spray atomization region from first principles. In contrast to prior work, this approach simulates the atomization process end-to-end, i.e., from the inlet of the injector to the spray dispersion region downstream. To that end, multiple simulation domains are coupled together to address the wide range of length scales that need to be captured. Another significant departure from standard approaches is that multiple sub-grid scale models are introduced to account for unresolved processes, most importantly a thin structure break-up model to explicitly model topology change. Simulations of a canonical two-fluid atomizer are quantitatively validated against experiments at identical operating conditions, including drop size statistics. As the computational prediction of liquid-gas flows remains arduous, it is no surprise that numerical frameworks for optimal control of liquid-gas flows have not received much attention from researchers yet. In the second part of this work, I present one of the very first computational adjoint frameworks for the optimization of liquid-gas flows using a sharp interface model. This approach is verified by showing low gradient errors for a range of test cases. It is then used to maximize the growth of a temporally evolving liquid-gas mixing layer, which demonstrates the potential of the proposed method for optimizing spray formation.
Download or read book Proceedings of the 2001 Fall Technical Conference of the ASME Internal Combustion Engine Division Diesel combustion and emissions fuel injection and sprays written by American Society of Mechanical Engineers. Internal Combustion Engine Division. Technical Conference and published by . This book was released on 2001 with total page 144 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Theory and Practice of Swirl Atomizers written by Yuriy I Khavkin and published by CRC Press. This book was released on 2003-10-28 with total page 490 pages. Available in PDF, EPUB and Kindle. Book excerpt: In this book, prominent Russian scientist Yuriy I. Khavkin shows that the droplet sizes in swirl atomizers depend only on the specific energy of the liquid drops and on viscosity. The new theory based only on two parameters is shown to be far simpler and in better agreement with experimental data than any previous presentations. The following topics are included in the book: · The solution of the Navier-Stokes equation for a liquid rotating flow · Atomizers for gas turbine combustion chambers · Atomizers for high capacity steam boilers · Atomizers for liquid-propellant rocket engines · Quality of liquid atomization by non-swirl atomizers · A unique table of experimental data of 232 atomizers, enables the reader to find an atomizer with the flow rate from 5 kg/h to 15,000 kg/h Readers will also learn: · To create an atomizer with the given mean droplet size · To create an atomizer with the given droplet size distribution · To create an atomizer with the given limits of flow rate control. The book is intended for the design engineer, as well as the theoretical scientist.
Download or read book Advancement of Numerical Methods for Simulating Primary Atomization written by Robert Michael Chiodi and published by . This book was released on 2020 with total page 180 pages. Available in PDF, EPUB and Kindle. Book excerpt: Multiphase flows are ubiquitous in natural and engineered systems and occur over scales ranging many orders of magnitude, from the movement of the ocean to the flow of blood through a capillary. In each case, the interface between the phases plays a key role in the dynamics of the flow. In this dissertation, I will detail the development of novel numerical methods for accurately and efficiently tracking the interface in simulations of multiphase flows, specifically focusing on flow configurations involving large density ratios, high shear at the interface, and liquid structures that span orders of magnitude in size. One specific instance where this occurs is during primary atomization, where a large liquid structure breaks up into smaller, more stable structures. This important class of flows is present in many different industries that currently employ over 2.5 million people. Enabling more accurate simulation of primary atomization is a central motivation of my work. To this end, I present significant improvements to the state-of-the-art for both level-set and volume of fluid methods. First, in the context of the conservative level-set method, the solution of the reinitialization equation is improved to drastically reduce the amount of error introduced. This reduction in error also leads to better volume conservation properties, especially for the under-resolved structures commonly created during atomization simulations. I then go on to detail improvements to geometric volume of fluid methods, which are capable of discretely conserving phase volumes at any level of resolution. For advecting the phase volumes, I provide a systematic approach to geometric advection on unstructured meshes that leads to significant gains in speed with no sacrifice in solution accuracy. On the topic of interface reconstruction, a novel multi-plane strategy capable of capturing arbitrarily-thin sub-grid scale films is given. To improve the performance of these methods, a general, robust, and efficient polyhedron intersection algorithm has also been developed and will be discussed in detail. In all cases, the work is placed in the context of the current state-of-the-art through direct comparison to published results. A major portion of my work has also involved creating the open-source Interface Reconstruction Library, which provides implementations of modern algorithms used in volume of fluid methods, including those presented in this dissertation. This library, along with the presented methods, has been applied to simulate large-scale, complicated, and realistic atomizing flows. In particular, they have driven the near-field simulation capabilities for an Office of Naval Research Multidisciplinary Research Initiative (MURI) on active spray control, been used to study the dynamics of a compressible liquid jet in cross-flow configuration for the Air Force Research Laboratory, and been employed by Los Alamos National Laboratory to simulate the injection of liquid metal in metal casting simulations.
Download or read book Internal Fluid Mechanics of an Effervescent Atomizer written by Miguel A. Balzán and published by . This book was released on 2015 with total page 314 pages. Available in PDF, EPUB and Kindle. Book excerpt: An experimental investigation was conducted with the purpose of studying the effects of selected operating and design variables in the flow inside an effervescent atomizer. A series of tests were performed in a horizontally oriented, square conduit of 12.7 mm in diameter which constituted the mixing chamber of the effervescent atomizer. The operating fluids were water and air. The air was injected perpendicularly into a fully developed, turbulent water flow, whose bulk water velocity values ranged between 1.1 and 4.3 m/s. The gas mass flow rate values were in the range between 8 and 60 × 10-3 g/s. Three different gas injectors, with diameters of 0.27 mm, 0.52 mm and 1.59 mm were used. The combination of variables allowed the operation of the atomizer within the limits of what constitutes a bubbly flow in pipes. High-speed shadowgraphy was the technique used to investigate thoroughly the dynamics between the gas and liquid phases near the gas injection region as well as upstream the discharge nozzle. A set of original, empirical expressions used to estimate the incipient centerline and borderline trajectories of the gas phase, during its initial interaction with the liquid and based on dimensionless parameters, were introduced. The assessment of the correlations gave a strong prediction of the initial centerline and borderline trajectories of the gas jet in the flowing liquid. The effects that the gas injection velocity, liquid mean velocity and injection gas injection diameter have on the process of bubble generation were investigated. Four distinct regimes were identified: Single Bubbling (SB), Pulse (P), Elongated Jetting (EJ) and Atomizing Jetting (AJ). It was observed that the shift between regimes occurs gradually, producing the need to identify transitional regions: SBP and PTJ. Sets of independent dimensionless variables were used to categorize the proposed regimes in bubble formation maps. Empirical correlations that delimit the boundaries between ordered and chaotic bubble generation were determined. An introductory description of the forces involved in the bubbling process was conducted. The results indicated that the form-induced drag and added mass force were dominant detaching and cohesive force respectively. While there was agreement with previous works regarding the dominant breakup effect, the results obtained for the main attaching force were unique. Also, a novel methodology for the estimation of dynamic shape based drag and added mass coefficient was included. The morphological features of the gas jet were described through empirical correlations based on relevant dimensionless numbers associated to the variations of three fundamental design parameters: liquid cross-flow velocity, gas mass flow rate and the nozzle dimensions. The gas jet features were compared with representative statistical diameters from the population distribution, resulting in an estimation of the averaged Sauter mean diameter and maximum bubble diameter as a function of the gas jet dimensions. It was determined that the gas injection conditions play a fundamental role in the internal flow characteristics for an effervescent atomizer.
Download or read book Proceedings of the Ist International Conference on Liquid Atomization and Spray Systems written by Keishin Matsumoto and published by . This book was released on 1979 with total page 492 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Atomization of Liquids by Injection Into High Velocity Gas Streams written by Arthur Frederick Limper and published by . This book was released on 1947 with total page 156 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Technical Literature Abstracts written by Society of Automotive Engineers and published by . This book was released on 1996 with total page 566 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Process and Chemical Engineering written by and published by . This book was released on 2002 with total page 746 pages. Available in PDF, EPUB and Kindle. Book excerpt:
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.
