Spray Formation: Three-Dimensional Liquid Break-Up Due to Surface Tension PDF Download
Are you looking for read ebook online? Search for your book and save it on your Kindle device, PC, phones or tablets. Download Spray Formation: Three-Dimensional Liquid Break-Up Due to Surface Tension PDF full book. Access full book title Spray Formation: Three-Dimensional Liquid Break-Up Due to Surface Tension by Robert E. Childs. Download full books in PDF and EPUB format.
Author: Robert E. Childs
Publisher:
ISBN:
Category :
Languages : en
Pages : 17
Get Book Here
Book Description
The growth instabilities on the interface between a liquid jet and its gaseous environment is an important mechanism in spray atomization, and it is the subject of the work reported herein. Numerical simulations based on the Navier-Stokes equations were used to model liquid/gas interface flows. An algorithm was developed for solving the unsteady Navier-Stokes equations for incompressible fluid with a discontinuity in density and with surface tensions and its accuracy was demonstrated. In flows representative of round pressure-atomized jets and pressure-swirl atomizers, nonuniform mean velocity distributions resulting from viscous boundary layers were found to have a significant effect on instability growth. In a round jet, the inclusion of a boundary layer-like velocity profile significantly reduced the growth rate of small wavelength instabilities. The velocity profile had a much greater effect than surface tension on the initial atomization process for the flow parameters considered. A good estimate of initial fuel droplet size was obtained by considering boundary layer effects but disregarding surface tension. In a flow representative of the fuel issuing from a pressure-swirl nozzle, nonuniformity of the velocity profile was found to increase the growth rate of a disturbance mode which is directly responsible for spray breakup. Keywords: Fuel sprays, Computational fluid dynamics. (MJM/AW).
Author: Robert E. Childs
Publisher:
ISBN:
Category :
Languages : en
Pages : 17
Get Book Here
Book Description
The growth instabilities on the interface between a liquid jet and its gaseous environment is an important mechanism in spray atomization, and it is the subject of the work reported herein. Numerical simulations based on the Navier-Stokes equations were used to model liquid/gas interface flows. An algorithm was developed for solving the unsteady Navier-Stokes equations for incompressible fluid with a discontinuity in density and with surface tensions and its accuracy was demonstrated. In flows representative of round pressure-atomized jets and pressure-swirl atomizers, nonuniform mean velocity distributions resulting from viscous boundary layers were found to have a significant effect on instability growth. In a round jet, the inclusion of a boundary layer-like velocity profile significantly reduced the growth rate of small wavelength instabilities. The velocity profile had a much greater effect than surface tension on the initial atomization process for the flow parameters considered. A good estimate of initial fuel droplet size was obtained by considering boundary layer effects but disregarding surface tension. In a flow representative of the fuel issuing from a pressure-swirl nozzle, nonuniformity of the velocity profile was found to increase the growth rate of a disturbance mode which is directly responsible for spray breakup. Keywords: Fuel sprays, Computational fluid dynamics. (MJM/AW).
Author: Robert E. Childs
Publisher:
ISBN:
Category :
Languages : en
Pages : 6
Get Book Here
Book Description
The objective of the work was the investigation of fluid dynamic and surface tension instabilities that effect the breakup of fuel jets in the atomization process. Computational and analytical methods were used. Initial work involved the evaluation of numerical methods for flows with density discontinuities. It was discovered that many commonly used methods are poorly suited to predicting two phase flows. However, a suitable method was found, and it was programmed in a Navier-Stokes prediction code. The code has passed some accuracy tests, and others are ongoing. Predictions of simple one and two phase flows were conducted as part of these tests. A method for computing surface tension effects was included in the prediction algorithm, but further work is ongoing to make the method more robust. A inviscid stability analysis of an expanding-radius liquid tubular jet was performed. It was found that no new instability mechanisms are introduced by the rate of change of radius. A viscous stability analysis of a shear layer with a discontinuity in density was initiated and will be continued. Keywords: Liquid jets, Mathematical models.
Author:
Publisher:
ISBN:
Category : Aeronautics
Languages : en
Pages : 400
Get Book Here
Book Description
Author:
Publisher:
ISBN:
Category : Aerodynamics
Languages : en
Pages : 78
Get Book Here
Book Description
Author: Avinash Kumar Agarwal
Publisher: Springer Nature
ISBN: 9811686181
Category : Technology & Engineering
Languages : en
Pages : 368
Get Book Here
Book Description
This book focuses on the simulation and modeling of internal combustion engines. The contents include various aspects of diesel and gasoline engine modeling and simulation such as spray, combustion, ignition, in-cylinder phenomena, emissions, exhaust heat recovery. It also explored engine models and analysis of cylinder bore piston stresses and temperature effects. This book includes recent literature and focuses on current modeling and simulation trends for internal combustion engines. Readers will gain knowledge about engine process simulation and modeling, helpful for the development of efficient and emission-free engines. A few chapters highlight the review of state-of-the-art models for spray, combustion, and emissions, focusing on the theory, models, and their applications from an engine point of view. This volume would be of interest to professionals, post-graduate students involved in alternative fuels, IC engines, engine modeling and simulation, and environmental research.
Author:
Publisher:
ISBN:
Category : Power resources
Languages : en
Pages : 840
Get Book Here
Book Description
Author:
Publisher:
ISBN:
Category : Power resources
Languages : en
Pages : 848
Get Book Here
Book Description
Author:
Publisher: ScholarlyEditions
ISBN: 1481674331
Category : Science
Languages : en
Pages : 346
Get Book Here
Book Description
Chlorides—Advances in Research and Application: 2013 Edition is a ScholarlyEditions™ book that delivers timely, authoritative, and comprehensive information about Cadmium Chloride. The editors have built Chlorides—Advances in Research and Application: 2013 Edition on the vast information databases of ScholarlyNews.™ You can expect the information about Cadmium Chloride in this book to be deeper than what you can access anywhere else, as well as consistently reliable, authoritative, informed, and relevant. The content of Chlorides—Advances in Research and Application: 2013 Edition has been produced by the world’s leading scientists, engineers, analysts, research institutions, and companies. All of the content is from peer-reviewed sources, and all of it is written, assembled, and edited by the editors at ScholarlyEditions™ and available exclusively from us. You now have a source you can cite with authority, confidence, and credibility. More information is available at http://www.ScholarlyEditions.com/.
Author: Efstathios Michaelides
Publisher: CRC Press
ISBN: 1315354624
Category : Science
Languages : en
Pages : 1559
Get Book Here
Book Description
The Multiphase Flow Handbook, Second Edition is a thoroughly updated and reorganized revision of the late Clayton Crowe’s work, and provides a detailed look at the basic concepts and the wide range of applications in this important area of thermal/fluids engineering. Revised by the new editors, Efstathios E. (Stathis) Michaelides and John D. Schwarzkopf, the new Second Edition begins with two chapters covering fundamental concepts and methods that pertain to all the types and applications of multiphase flow. The remaining chapters cover the applications and engineering systems that are relevant to all the types of multiphase flow and heat transfer. The twenty-one chapters and several sections of the book include the basic science as well as the contemporary engineering and technological applications of multiphase flow in a comprehensive way that is easy to follow and be understood. The editors created a common set of nomenclature that is used throughout the book, allowing readers to easily compare fundamental theory with currently developing concepts and applications. With contributed chapters from sixty-two leading experts around the world, the Multiphase Flow Handbook, Second Edition is an essential reference for all researchers, academics and engineers working with complex thermal and fluid systems.
Author: John H Johnson
Publisher: SAE International
ISBN: 0768011213
Category : Technology & Engineering
Languages : en
Pages : 700
Get Book Here
Book Description
Emission and fuel economy regulations and standards are compelling manufacturers to build ultra-low emission vehicles. As a result, engineers must develop spark-ignition engines with integrated emission control systems that use reformulated low-sulfur fuel. Emission Control and Fuel Economy for Port and Direct Injected SI Engines is a collection of SAE technical papers that covers the fundamentals of gasoline direct injection (DI) engine emissions and fuel economy, design variable effects on HC emissions, and advanced emission control technology and modeling approaches. All papers contained in this book were selected by an accomplished expert as the best in the field; reprinted in their entirety, they present a pathway to integrated emission control systems that meet 2004-2009 EPA standards for light-duty vehicles.
