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Atomization and Sprays

Publication de 12  numéros par an

ISSN Imprimer: 1044-5110

ISSN En ligne: 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

STATE OF THE ART REVIEW OF FLASH-BOILING ATOMIZATION

Volume 26, Numéro 12, 2016, pp. 1259-1305
DOI: 10.1615/AtomizSpr.2016015626
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RÉSUMÉ

Flash boiling atomization is now a widespread practice for creating fine sprays. The present paper aims to review and analyze our current knowledge on flash atomization processes and applications. First, the fundamental physical processes of flash-boiling atomization, i.e., nucleation and bubble growth. Then, their role in creating optimal spray (small droplet diameters and short breakup length) is analyzed. Special attention is given to reviewing and comparing different transition criteria. The conclusions can be used by those who aim to avoid accidental scenarios, or, to minimize hazardous scenarios. New surfaces are created thanks to boiling (or cavitation). The relative magnitude of the new surfaces increases as the bubbles grow, and once the two-phase fluid discharges, due to the relative kinetic energies of the liquid and the gas. Better jet atomization is observed when flashing occurs within the aperture. Higher superheat degrees lead to finer spray; thereby homogeneous nucleation should be aspired to when designing an optimal injector. Twin orifice injector with an expansion chamber is preferable for multi-component liquid, especially since it enables ones to achieve the desired sprays for lower pressures and superheat degrees. While in a single orifice injector, the highest superheat degree should be aspired to, the desired superheat degree has an upper limit for injectors with an expansion chamber. Too high superheat degrees can lead to extensive bubble coalescence and to flow stratification, thereby damaging the spray quality. The optimal degree is the one that will lead to high nucleation rate, accompanied with the highest slip between the phases. There is a lack in data of depressurization rates and their relation to spray characteristics for different liquids. In addition, experiments and data are lacking with regard to multi-component liquids.

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