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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

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THE EFFECTS OF GAS LAYER AND LIQUID PHYSICAL PROPERTIES ON THE BREAKUP OF COAXIAL LIQUID JET SPRAY

Volume 26, Numéro 6, 2016, pp. 585-605
DOI: 10.1615/AtomizSpr.2015013223
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RÉSUMÉ

A coaxial injector is mainly used in large-scale liquid rocket engines. By utilizing optical methods, this research studies the effects of the gas to liquid velocity ratio (2.9−60), gas layer thickness (1.2−2.4 mm), and liquid physical properties (surface tension and viscosity) on the breakup and atomization of coaxial liquid jet spray. The spray angles, droplet size distributions, and breakup processes at different experimental conditions are observed and analyzed. The results reveal the significance of the breakup of the coaxial jet spray as the surrounding high-speed air confines the spray spatially and forces the inherent unstable liquid column into spiral-type turning, then elongates into a ligament before instantaneous breakup. Once the liquid jet has broken up, the outer high-speed air appears to have no further effect on the spray. Owing to this controlling breakup process, the spray angle appears to be increased with increasing velocity ratio and decreased with increasing gas layer thickness, and the droplet size distribution of coaxial jet spray appears to be uniform, concentrated, and invariant after the jet has broken up. Liquid viscosity shows a strong effect on coaxial jet spray. With higher viscosity, the liquid ligament is stretched wider before disintegration; that is, the liquid ligament may utilize more energy of the surrounding high-speed air for liquid atomization, thus producing a larger spray angle and smaller droplet sizes, as observed in the experiments.

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