A Prediction of the Droplet Size and Velocity Distribution in a Spray from First Principles [microform] PDF Download
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Author: Richard William Sellens
Publisher: National Library of Canada
ISBN: 9780315295537
Category : Particle size determination
Languages : en
Pages : 147
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Book Description
The maximum entropy formalism is used to predict the droplet size and velocity distribution in a spray resulting from the breakup of a liquid sheet. The physics of the process are described by simple conservation constraints for mass, momentum, surface energy and kinetic energy. The predicted size distribution is compared with four empirical distributions and found very similar to a Rosin - Rammler distribution with the same parameters. The predicted velocity distribution has a Gaussian cross section at any particular droplet diameter. The variance of the Gaussian decreases with increasing droplet diameter, so that the velocity is nearly single valued for large droplets, but varies widely for smaller droplets. This size and velocity distribution is propagated downstream using a simple physical model which assumes a uniform velocity air flow field, no evaporation, and treats the droplets as solid spheres. Although this is a substantial simplification, it shows that, in the absence of fluctuations in the air stream around the droplets, droplet velocity distributions collapse towards single values. This process takes place over distances which are short when compared to the scale of common spray systems.
![A Prediction of the Droplet Size and Velocity Distribution in a Spray from First Principles [microform] PDF](https://books.google.com/books/content/images/frontcover/sjSXwgEACAAJ?fife=w80-h100)
Author: Richard William Sellens
Publisher: National Library of Canada
ISBN: 9780315295537
Category : Particle size determination
Languages : en
Pages : 147
Get Book Here
Book Description
The maximum entropy formalism is used to predict the droplet size and velocity distribution in a spray resulting from the breakup of a liquid sheet. The physics of the process are described by simple conservation constraints for mass, momentum, surface energy and kinetic energy. The predicted size distribution is compared with four empirical distributions and found very similar to a Rosin - Rammler distribution with the same parameters. The predicted velocity distribution has a Gaussian cross section at any particular droplet diameter. The variance of the Gaussian decreases with increasing droplet diameter, so that the velocity is nearly single valued for large droplets, but varies widely for smaller droplets. This size and velocity distribution is propagated downstream using a simple physical model which assumes a uniform velocity air flow field, no evaporation, and treats the droplets as solid spheres. Although this is a substantial simplification, it shows that, in the absence of fluctuations in the air stream around the droplets, droplet velocity distributions collapse towards single values. This process takes place over distances which are short when compared to the scale of common spray systems.
Author:
Publisher:
ISBN:
Category : Canada
Languages : en
Pages : 684
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Book Description
Author:
Publisher:
ISBN:
Category :
Languages : en
Pages : 9
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Book Description
A water spray, from a twin-fluid atomizer, was studied at different air temperature and at atmospheric pressure. The Sauter Mean Diameter, D32, and the droplet volume distribution were measured at four different distances from the injector. An optical method was used to measure droplet sizes. Predictions of the Sauter Mean Diameter, liquid volume concentration and droplet size distribution were also evaluated. The influence of the air velocity, air temperature and of the water flow rate in the spray S.M.D. and in the liquid volume concentration at different distance from the injector have been measured. The predictions showed good agreement with experimental results.
Author: Huimin Liu
Publisher: William Andrew
ISBN: 0815518943
Category : Technology & Engineering
Languages : en
Pages : 541
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Book Description
This is the first book to encompass the fundamental phenomenon, principles, and processes of discrete droplets of both normal liquids and melts. It provides the reader with the science and engineering of discrete droplets, and provides researchers, scientists and engineers with the latest developments in the field. The book begins with a systematic review of various processes and techniques, along with their applications and associations with materials systems. This is followed by a description of the phenomena and principles in droplet processes. Correlations, calculations, and numerical modeling of the droplet processes provide insight into the effects of process parameters on droplet properties for optimization of atomizer design. Droplets are found in the areas of metallurgy, materials, automotive, aerospace, medicine, food processing, agriculture, and power generation, and encountered in a huge range of engineering applications.
Author: Said Al Rabadi
Publisher: Cuvillier Verlag
ISBN: 3867275440
Category :
Languages : en
Pages : 111
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Book Description
Author: Meishen Li
Publisher:
ISBN:
Category :
Languages : en
Pages : 404
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Book Description
Author: Richard W. Sellens
Publisher:
ISBN:
Category :
Languages : en
Pages : 264
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Book Description
Author: Rogério Gomes Pimentel
Publisher:
ISBN:
Category : Aerosols
Languages : en
Pages : 0
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Book Description
Author: Arnold Frohn
Publisher: Springer Science & Business Media
ISBN: 3662040409
Category : Technology & Engineering
Languages : en
Pages : 298
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Book Description
The book deals with the dynamical behaviour of single droplets and regular droplet systems. It has been written mainly for experimental researchers. After a short description of the theoretical background, the different experimental facilities and methods necessary for the investigation of single droplets are described in detail. A summary of important applications is included.
Author: D. L. Davidson
Publisher:
ISBN:
Category :
Languages : en
Pages : 43
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Book Description
The feasibility of determining the droplet size distribution of a simulated defoliant spray in a high-velocity airstream using in-line holographic photography was successfully demonstrated. Holographic droplet size data were obtained in the 400-knot airstream contained within a 37-inch-diameter duct at spray flow rates from 3 to 117 gpm and spray injection pressures from 16 to 64 psig. Average diameter of the spray droplets was approximately 21 microns. Droplet size distribution did not vary significantly with either spray flow rate or injection pressure. The holographic measurement system exhibited an apparent diametric resolution limit of approximately 10 microns. Operational reliability of the holograph was satisfactory. (Author).
