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International Journal of Fluid Mechanics Research

Publicou 6 edições por ano

ISSN Imprimir: 2152-5102

ISSN On-line: 2152-5110

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: 1.1 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: 1.3 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: 0.0002 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: 0.33 SJR: 0.256 SNIP: 0.49 CiteScore™:: 2.4 H-Index: 23

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Observation of Droplet Cluster Behaviors in a Premixed-Spray Flame by Laser Tomography

Volume 24, Edição 1-3, 1997, pp. 331-339
DOI: 10.1615/InterJFluidMechRes.v24.i1-3.330
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RESUMO

Laser tomography consisting of a high-speed digital CCD camera and an Ar-ion laser sheet were applied to a premixed-spray flame to visualize droplet cluster behaviors and to examine the formation and combustion processes of droplet clusters in the flame. By monitoring a time-series of cross-sectional images of the premixed-spray, it became clear that there were no distinct droplet clusters in the non-combusting case. When it was ignited, on the other hand, some portions of the spray stream disappeared rapidly probably due to the flame propagation through easy-to-burn regions, and unburned regions remained as droplet clusters flowed downstream. Furthermore, the droplet clusters seemed to act as sources of fuel-vapor and burned in the diffusion combustion mode, because their shape and size did not change rapidly in the downstream. Based on these observations, it was confirmed that, in the process of cluster formation, the phenomenon was very rapid and dominated by the flame propagation, and once the clusters were formed, the burning process of clusters was relatively slow and dominated by the diffusion combustion. In order to quantify the above mentioned phenomena, we defined cluster-based disappearance rate, ω, in stead of the conventional droplet evaporation rate or burning rate. As a result, ω was large in the upstream region of the spray flame where the flame propagation occurred intensively, while ω was relatively small in the downstream region where diffusion combustion was dominant.

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