Measurement and Prediction of Droplet Size Distribution in Sprays PDF Download
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Author: Rogério Gomes Pimentel
Publisher:
ISBN:
Category : Aerosols
Languages : en
Pages : 0
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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:
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: ME. Teske
Publisher:
ISBN:
Category : Droplet size distribution
Languages : en
Pages : 13
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Book Description
Various experimental techniques have been developed to recover droplet size distributions emitted from rotary atomizers. These techniques include both single line-of-sight measurements through the center of the spray cloud and volume weighted averaging from multiple passes through portions of the spray. Because the droplet size distribution of a spray is one of the most important inputs into aerial spray prediction models such as AgDRIFT®, a consistent, widely-accepted standard for rotary atomizers should be developed and implemented with regard to this measurement. No such standard currently exists. The present paper summarizes current measurement techniques and develops a simple computer model to predict droplet movement following emission from a rotary atomizer in a wind tunnel. Qualitative comparisons are made with available data to demonstrate the effects of single line-of-sight measurements and weighted averaging from multiple passes.
Author: Joseph Arena
Publisher:
ISBN:
Category :
Languages : en
Pages : 192
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Book Description
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: W. A. Sirignano
Publisher: Cambridge University Press
ISBN: 0521884896
Category : Science
Languages : en
Pages : 481
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Book Description
This book discusses the theoretical foundations of spray and droplet applications relevant to the technology for active control of sprays applied to new products and applications, improved product performance, cost reductions, and improved environmental outcomes. It also covers theory related to power and propulsion; materials processing and manufacturing technologies including droplet-based net form processing, coating, and painting; medication; pesticides and insecticides; and other consumer uses.
Author: David S. Mahler
Publisher:
ISBN:
Category : Herbicides
Languages : en
Pages : 92
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Book Description
This work investigated the applicability of using hot-wire instrumentation for the measurement of the droplet size distributions of insecticide and herbicide sprays. Under Phase I, mineral oil was used as a model liquid. Tests were performed to determine the effects of eccentric collisions, longitudinal variations along the wire, probe contamination, and temperature stability. A calibration curve was obtained for mineral oil which is different than that of water. This calibration curve shows that the hot-wire approach is accurate for a size range of 1 to 240 micrometers. This range is more than adequate for existing insecticide spray apparatus. Tests using actual insecticides have shown that the calibration curve obtained for mineral oil may be used for at least the two insecticides investigated.
![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
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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.
Author: Nasser Ashgriz
Publisher: Springer Science & Business Media
ISBN: 1441972641
Category : Technology & Engineering
Languages : en
Pages : 922
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Book Description
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.
Author: Richard W. Sellens
Publisher:
ISBN:
Category :
Languages : en
Pages : 264
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Book Description
