[PDF] Analysis Of Atomization Systems Through Mathematical Modeling And Experimentation eBook

Author : Ali Asgarian
Publisher :
Page : pages
File Size : 26,14 MB
Release : 2020
Category :
ISBN :

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Water atomization (WA) of a molten metal is a well-established and cost-effective industrial approach to producing low-reactive metal powders. However, WA powders are characterized by a wide spread of particle size unsuitable for certain powder metallurgy applications. To address this limitation, this thesis examines some of the poorly understood fluid mechanics phenomena involved in WA, to develop fundamental knowledge that describes the relationships between the design and operating conditions of a water atomizer, and the particle size distribution (PSD) of the resulting powder. In the first part of the thesis, a flat fan water spray is studied by experiment and computational fluid dynamics (CFD) simulation. The disintegration of a liquid sheet into a spray is examined, an optical technique to measure a multi-range droplet size distribution (DSD) in a developing spray is presented, and an enhanced model to quantify the momentum flux of a spray where it impinges a melt stream is proposed. The model suggests that the momentum flux of a spray, and thus the atomization capacity, increases with spray pressure and decreases with the travel distance of the spray from the nozzle to the impingement point and with the spray spreading angle. In the second part of the thesis, the above findings are examined via production of a low melting point alloy (Bi-42% Sn) powder using a laboratory-scale water atomizer that was designed and built for this work. The effects of various design and operating parameters, including water pressure, melt superheat, apex angle, and spray configuration on the mass median size (d50) and standard deviation (SD) of the powder PSD are investigated, and correlations proposed. These correlations can be used to control the size features of water atomized powders produced at industrial scale, by engineering various design and operating parameters, and thus expanding the market for water atomized powders.

Author : Anders Rasmuson
Publisher : Cambridge University Press
Page : 195 pages
File Size : 40,18 MB
Release : 2014-03-20
Category : Technology & Engineering
ISBN : 1107049695

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A solid introduction, enabling the reader to successfully formulate, construct, simplify, evaluate and use mathematical models in chemical engineering.

Author : Udo Fritsching
Publisher : Cambridge University Press
Page : 290 pages
File Size : 47,72 MB
Release : 2004-02-26
Category : Technology & Engineering
ISBN : 1139449729

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Spray forming combines the metallurgical processes of metal casting and powder metallurgy to fabricate metal products with enhanced properties. This book provides an introduction to the various modelling and simulation techniques employed in spray forming, and shows how they are applied in process analysis and development. The author begins by deriving and describing the main models. He then presents their application in the simulation of the key features of spray forming. Wherever possible he discusses theoretical results with reference to experimental data. Building on the features of metal spray forming, he also derives common characteristic modelling features that may be useful in the simulation of related spray processes. The book is aimed at researchers and engineers working in process technology, chemical engineering and materials science.

Author : Wade H. Shafer
Publisher : Springer Science & Business Media
Page : 304 pages
File Size : 13,95 MB
Release : 2013-11-21
Category : Science
ISBN : 1475757824

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Masters Theses in the Pure and Applied Sciences was first conceived, published, and dis seminated by the Center for lnformation and Numerica/ Data Analysis and Synthesis (C/NDAS) * at Purdue University in 1957, starting its coverage of theses with the academic year 1955. Beginning with Volume 13, the printing and dissemination phases of the ac tivity were transferred to University Microfilms/Xerox of Ann Arbor, Michigan, with the thought that such an arrangement would be more beneficia! to the academic and general scientific and technical community. After fi ve years of this joint undertaking we had concluded that it was in the interest of ali concerned if the printing and distribution of the volume were handled by an international publishing house to assure improved service and broader dissemination. Hence, starting with Volume 18, Masters Theses in the Pure and App/ied Sciences has been disseminated on a worldwide basis by Plenum Publishing Corporation of New York, and in the same year the coverage was broadened to include Canadian universities. Ali back issues can also be ordered from Plenum. We have reported in Volume 21 (thesis year 1976) a total of 10,586 theses titles from 25 Canadian and 219 United States universities. We are sure that this broader base for theses titles reported will greatly enhance the value of this important annual reference work.