SCIENCE

Liquid Atomization

Author: L. Bayvel

Publisher:

ISBN:

Category: SCIENCE

Page:

View: 790

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
Science

Liquid Atomization

Author: L.P. Bayvel

Publisher: CRC Press

ISBN:

Category: Science

Page: 475

View: 518

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 measure the macro- and microstructure parameters of atomized liquid. With a copious amount of numerical problems available for use as student tutorials, the book is suitable as a supplemental text for courses in mechanical, chemical, fuel, aeronautical, civil, and agricultural engineering.
Science

Liquid Atomization

Author: L.P. Bayvel

Publisher: Routledge

ISBN:

Category: Science

Page: 476

View: 792

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
Atomization

Experimental and Computational Study on Liquid Atomization by Slinger Injector

Author: Carmen Sescu

Publisher:

ISBN:

Category: Atomization

Page: 219

View: 537

In this research work the flow characteristics of a type of rotary atomizer, referred to as slinger injector, were experimentally and numerically investigated at relatively low rotational speeds. Although slinger injectors provide a good level of atomization at high rotational speeds where they are intended to operate (30,000 rpm or higher), a critical aspect in small gas turbines is related to the start-up phase, which typically takes place at speeds around 10,000 rpm. The quality of atomization is very important, especially at these low speeds where smaller mean fuel droplet diameters are desirable. The current work focused on the study of atomization provided by slinger injectors at rotational speed related pertinent to the start-up phase (up to 15,000 rpm). An optical measurement system was implemented to investigate the liquid atomization provided by the slinger injector. The qualitative behavior of fuel emerging from the slinger was evaluated to determine whether a satisfactory atomization was provided within a distance compatible with the size of a small gas turbine engine combustion chamber. The size of the droplets was measured using the Global Sizing Velocimetry (GSV) system. Visualization of the primary liquid breakup process, determination of breakup lengths, and measurement of droplet size were performed by varying rotational speed, liquid flow rate, injector hole shape, size and orientation, and number of holes. Photographs of the liquid breakup, various mean and representative diameters, droplet size histograms and cumulative volume distribution are presented. The findings of this thesis show that droplet size decrease with an increase in rotational speed, as expected. Moreover, hole diameter, hole shape and flow rates affect the slinger atomization. For a given flow rate and a given rotational speed, the experimental data show that the droplet sizes decrease by increasing the hole diameter. The droplets increase in size when the flow rates is increased for a given hole size. The atomization was found to be characteristically different for a slit compared to a circular hole injector. However, the orientation of the emerging jet relative to the axis of rotation insignificantly influenced the slinger atomization for the cases studied. A correlation equation was obtained for a slinger with circular hole, estimating the Sauter mean diameter as a function of the rotational speed of the slinger, the hole diameter, the liquid flow rate and the liquid properties. Two-dimensional and three-dimensional numerical simulations of the internal flow and the external near-field flow for a slinger atomizer were conducted. The simulations were carried out using the commercial Computational Fluid Dynamics code FLUENT, wherein the Volume of Fluid model was used to track the interface between the two phases. A User Defined Function was developed to take into account the centrifugal and Coriolis forces needed for FLUENT computations. The numerical simulations focused on the study of formation of the liquid film along the channel injector wall, and on the upstream characteristics of the liquid jet near the exit of the atomizer. The numerical simulations were in qualitative agreement with the experiment, showing that an annular jet exiting from the channel collapses and the liquid breaks up into droplets a short distance from the exist. The results show that the Volume of Fluid model is appropriate for developing simulation models of the working of a slinger atomizer.
Technology & Engineering

Atomization and Sprays

Author: Arthur Lefebvre

Publisher: CRC Press

ISBN:

Category: Technology & Engineering

Page: 434

View: 577

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 considerations, drop size distribution of sprays, flow in atomizers, atomizer performance, external spray characteristics, drop evaporation, and drop sizing methods.
Atomization

Proceedings of the 7th International Conference on Liquid Atomization and Spray Systems, August 18-22, Seoul, Korea

Author: Begell House Publication

Publisher: Begell House Publishers

ISBN:

Category: Atomization

Page: 1153

View: 530

Interest and activity in research and development in the fields of atomization and sprays are increasing dramatically. At this conference, 170 abstracts were submitted from 20 different countries, collecting important research in basic atomization, fuel injection, measurement techniques, modeling of sprays, twin-fluid atomization, process/industry applications, spray combustion, and other areas of interest.
Technology & Engineering

Atomization and Sprays

Author: Arthur H. Lefebvre

Publisher: CRC Press

ISBN:

Category: Technology & Engineering

Page: 284

View: 592

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.
Technology & Engineering

Industrial Sprays and Atomization

Author: Ghasem G. Nasr

Publisher: Springer Science & Business Media

ISBN:

Category: Technology & Engineering

Page: 501

View: 222

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.

Numerical Methods for Liquid Atomization and Application in Detailed Simulations of a Diesel Jet

Author: Olivier Desjardins

Publisher:

ISBN:

Category:

Page: 194

View: 730

The present approach is applied in a detailed study of the turbulent atomization process characteristic of Diesel injection. First, a temporally evolving turbulent planar jet is simulated for various Reynolds and Weber numbers. Direct visualization of the flow structures allows to lay out a clear picture of the atomization process. Early interface deformation is caused by turbulent eddies that carry enough kinetic energy to overcome surface tension forces. Then, liquid protrusions are stretched out into ligaments that rupture following Rayleigh's theory. Results suggest that aerodynamic effects contribute to both the early disruption of the liquid core and the rupture of liquid ligaments. Finally, a spatially evolving round liquid jet is simulated and qualitatively compared to recent experimental visualizations of Diesel injection.
Technology & Engineering

Handbook of Atomization and Sprays

Author: Nasser Ashgriz

Publisher: Springer Science & Business Media

ISBN:

Category: Technology & Engineering

Page: 935

View: 889

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.