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Atomization and Sprays

Publicado 12 números por año

ISSN Imprimir: 1044-5110

ISSN En Línea: 1936-2684

The Impact Factor measures the average number of citations received in a particular year by papers published in the journal during the two preceding years. 2017 Journal Citation Reports (Clarivate Analytics, 2018) IF: 1.2 To calculate the five year Impact Factor, citations are counted in 2017 to the previous five years and divided by the source items published in the previous five years. 2017 Journal Citation Reports (Clarivate Analytics, 2018) 5-Year IF: 1.8 The Immediacy Index is the average number of times an article is cited in the year it is published. The journal Immediacy Index indicates how quickly articles in a journal are cited. Immediacy Index: 0.3 The Eigenfactor score, developed by Jevin West and Carl Bergstrom at the University of Washington, is a rating of the total importance of a scientific journal. Journals are rated according to the number of incoming citations, with citations from highly ranked journals weighted to make a larger contribution to the eigenfactor than those from poorly ranked journals. Eigenfactor: 0.00095 The Journal Citation Indicator (JCI) is a single measurement of the field-normalized citation impact of journals in the Web of Science Core Collection across disciplines. The key words here are that the metric is normalized and cross-disciplinary. JCI: 0.28 SJR: 0.341 SNIP: 0.536 CiteScore™:: 1.9 H-Index: 57

Indexed in

A STUDY OF LIQUID METAL ATOMIZATION USING CLOSE-COUPLED NOZZLES, PART 1: GAS DYNAMIC BEHAVIOR

Volumen 15, Edición 1, 2005, pp. 19-40
DOI: 10.1615/AtomizSpr.v15.i1.20
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SINOPSIS

Liquid metal atomization using close-coupled nozzles is an established technique for fabricating fine (< 100-μm) metal powders for a variety of industrial uses. Despite its widespread use, however, the interrelationships among gas dynamics, nozzle geometry, processing parameters, and particle size remain ill-defined. As a result, efforts to reduce powder costs by improving particle size control and energy efficiency remain hindered. This study examines and compares examples of a convergent and a converging-diverging (c-d) close-coupled nozzle on the basis of their gas dynamic behavior (Part 1) and their liquid metal atomization performance (Part 2). In Part 1, Schlieren photography and Mach number and Pitot pressure measurements are used to characterize the gas dynamic behavior of the nozzles (without liquid metal present) operating at stagnation pressures between 2 and 5 MPa. In Part 2, their liquid metal atomization behavior is examined by high-speed Schlieren photography, and particle size distributions are measured to compare their atomization performance. Results showed that the two nozzles performed similarly in gas flow and atomization tests over most of the range of Po examined, despite their significantly different geometries. The active atomization zone appeared to extend far downstream, indicating that gas velocity decay by turbulent diffusion may play a limiting role in atomization. This also suggests that the importance of the gas-to-liquid mass flux ratio has a physical basis associated with a ratio of velocity decay length to breakup length scales. These observations have potentially important implications for designing efficient liquid metal atomization processes for producing low-cost metal powders.

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