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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

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EFFECT OF LIQUID PROPERTIES ON THE BREAKUP MECHANISM OF HIGH-SPEED LIQUID DROPS

Volumen 11, Edición 1, 2001, pp. 1-19
DOI: 10.1615/AtomizSpr.v11.i1.10
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SINOPSIS

The breakup mechanisms of liquid drops in high-velocity air flows were studied. Ultra high-magnification, short-exposure photography was used to analyze drop breakup in three drop breakup regimes previously referred to as the bag breakup regime, the "shear" or "boundary-layer stripping" breakup regime, and the "catastrophic" breakup regime. Diesel fuel and water were used as the spray liquids, and the air gas pressure was varied from atmospheric up to 0.6 MPa at room temperature to avoid liquid vaporization. In the experiments the drop Weber number was varied between 78 and 476, and the drop Reynolds number was changed from 1046 to 9327. The results show that the breakup process is primarily influenced by the value of the Weber number in all three breakup regimes. Consistent with an earlier study of Liu and Reitz [1], the present results further question the validity of the widely used "shear" or "boundary-layer stripping" drop breakup theories, which ascribe the breakup mechanism of high-speed drops to viscous stresses at the gas-liquid interface. Instead, the present results indicate that high-speed drop breakup is due to distortion of the drops and the formation of thin liquid sheets at the edge of the flattened drops. The liquid sheets are stretched and bent by the air flow and form ligaments that ultimately break up into droplets. The shape and length of the ligaments depend strongly on the liquid surface tension coefficient. The breakup mechanisms of drops with the different liquids were found to be similar at atmospheric and elevated ambient pressure conditions provided that the Weber number was the same. However, under "catastrophic" breakup conditions the secondary breakup of the filaments or ligaments was accelerated at high gas density.

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