Rotary Atomizer: Investigation of the Internal and External Liquid Flow and Atomization PDF Download
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Author: Maximilian Kuhnhenn
Publisher:
ISBN:
Category :
Languages : en
Pages :
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Book Description
Author: Maximilian Kuhnhenn
Publisher:
ISBN:
Category :
Languages : en
Pages :
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Book Description
Author: Carmen Sescu
Publisher:
ISBN:
Category : Atomization
Languages : en
Pages : 219
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Book Description
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.
Author: L.P. Bayvel
Publisher: Routledge
ISBN: 1351434950
Category : Science
Languages : en
Pages : 488
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Book Description
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
Author: Arthur H. Lefebvre
Publisher: CRC Press
ISBN: 1498736262
Category : Technology & Engineering
Languages : en
Pages : 284
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Book Description
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.
Author: Yuriy I Khavkin
Publisher: CRC Press
ISBN: 9781560329756
Category : Technology & Engineering
Languages : en
Pages : 490
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Book Description
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.
Author: Arthur Lefebvre
Publisher: CRC Press
ISBN: 9780891166030
Category : Technology & Engineering
Languages : en
Pages : 440
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Book Description
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.
Author:
Publisher: Universal-Publishers
ISBN: 1612336248
Category :
Languages : en
Pages : 500
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Book Description
Author: Rustam Homi Sethna
Publisher:
ISBN:
Category :
Languages : en
Pages : 360
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Book Description
Author: Ghasem G. Nasr
Publisher: Springer Science & Business Media
ISBN: 1447138163
Category : Technology & Engineering
Languages : en
Pages : 515
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Book Description
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.
Author: Mona Hassanzadeh Jobehdar
Publisher:
ISBN:
Category :
Languages : en
Pages :
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Book Description
Effervescent atomization uses the internal gas-liquid mixture to produce spray. The behavior of two-phase flow inside the atomizer influences the spray characteristics and is dependent on the atomizer internal geometry and operating conditions. The present study is conducted in two parts; study of the bubble formation from a novel submerged nozzle in a liquid cross-flow and investigation of the internal and external two-phase flows in an effervescent atomizer. The present study investigated the performance of a novel nozzle developed by Gadallah and Siddiqui (2013) in the liquid cross-flow. The impact of the nozzle shape, its configurations and orientations was experimentally investigated. The results showed that the novel nozzle generates smaller bubbles at higher detachment frequency for all cases compared to the standard nozzle. It is found that the elastic rebound of the bubble from a side hole plays a key role in the early bubble detachment. For the effervescent atomizer study, the impact of atomizer's internal geometry on the internal flow and spray droplet characteristics were studied. The results demonstrated that a conical base aerator tube and shorter mixing zone length provide more uniform bubbles in smaller size. A new type of bubble breaker was designed and tested in an effervescent atomizer. The results show that both internal and external two-phase flows in the atomizer were strongly influenced by bubble breaker configurations (diameter and number of holes). It was found that the liquid shear stress is the dominant force causing the bubble elongation and its eventual breakup.
