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Atomization and Sprays

Publicou 12 edições por ano

ISSN Imprimir: 1044-5110

ISSN On-line: 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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A DROP-SHATTERING COLLISION MODEL FOR MULTIDIMENSIONAL SPRAY COMPUTATIONS

Volume 9, Edição 3, 1999, pp. 231-254
DOI: 10.1615/AtomizSpr.v9.i3.10
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RESUMO

A simplified model of drop-shattering collision is proposed. It is assumed that two droplets collide with a sufficient collisional Weber number that they are transformed into a long cylindrical liquid ligament. As this ligament elongates under the impulse of the collision, based on Rayleigh linear jet breakup theory, capillary wave-induced disturbances grow, and if the time needed for them to develop is shorter than the time taken by the two ends of the cylinder to retract, they eventually break it into droplets. Drop-shattering breakup in the short-ligament regime is not considered in the present model. The equation of the dynamics of elongating and retracting cylindrical liquid ligaments is derived and analyzed. The model was also implemented into the multidimensional KIVA-II code. Experiments on the collisional behavior of hydrocarbon droplets of Hung and Martin [1] were used for model validation. These experiments consider the collision of two aerodynamically stable streams of droplets at three different intersection angles. The predicted size and velocity distributions of the children droplets are compared with the experimental results obtained with phase Doppler particle analysis. Although the sizes and velocities of the droplets are somewhat overpredicted, the model is able to predict atomization due to collisions. The model was also tested in a high-pressure, nonevaporating diesel spray to assess the influence of drop shattering. The results show that collisions involving shattering collisions seem to be very likely to occur in diesel sprays, and a deeper understanding of spray physics in this regime and a better prediction are obtained.

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