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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

TURBULENCE CHARACTERISTICS OF A TWIN-FLUID ATOMIZER

Volumen 6, Edición 5, 1996, pp. 577-600
DOI: 10.1615/AtomizSpr.v6.i5.40
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SINOPSIS

The role of turbulence on the disintegration of two-phase jets ejected from a twin-fluid atomizer of internal mixing type with orifice, TFA-IM-O, was studied experimentally. The relationship between mixing and flow patterns in the mixing chamber, and atomization patterns of the ejected two-phase jets, were observed, and it was found that fine spray was generated by the complete mixing of air and liquid and filled with bubble flow in the mixing chamber. The geometry of the atomizer to obtain fine spray with lower pressure is discussed, and a model of mixing and primary disintegration through bubbles related with turbulence within the mixing chamber is proposed.
The structure of spray from the TFA-IM-O was studied using a phase Doppler particle analyzer (PDPA), and novel characteristics of this spray were measured. The central zone was filled with finer droplets of dense flux and the outer zone was coarse and sparse. Change of the drop mean diameters, numbers from near the nozzle port toward downstream, and radial direction were analyzed, and it was found that the most intense disintegration of liquid, by primary disintegration within two-phase jets, occurred near the nozzle port around the axial zone. The droplet number increased after the primary disintegration and was considered as the secondary disintegration.
Turbulent flow characteristics of air within air jets, and spray jets issued from TFA-IM-O, were measured by LDV and compared with that from a circular tube (CT). It was found that the turbulent intensity of the TFA-IM-O immediately after ejection was greater by about six times than that from the CT. From the experimental results, it was considered that the turbulence of liquid and air within two-phase fluid in the mixing chamber would promote disintegration into finer bubbles, by Reynolds stress, and immediately after ejection from the orifice port, the bubbles separate from the two-phase jet core surface and burst into the fine droplets (primary disintegration). The primary disintegration continues from the nozzle port until about 40D2 (D2 = orifice diameter). Though the disintegration by relative velocity may continue at the outer zone of the spray jet, the secondary disintegration of droplets may proceed after 40D2 to about 100D2 downstream, by the intense Reynolds stress of turbulence of air.

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