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Journal of Flow Visualization and Image Processing

Publicado 4 números por año

ISSN Imprimir: 1065-3090

ISSN En Línea: 1940-4336

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: 0.6 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: 0.6 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: 0.00013 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: 0.14 SJR: 0.201 SNIP: 0.313 CiteScore™:: 1.2 H-Index: 13

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PROCESSING TOOLS TO TRACK AND CHARACTERIZE SURFACE SWIRLS

Volumen 26, Edición 1, 2019, pp. 1-17
DOI: 10.1615/JFlowVisImageProc.2018026163
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SINOPSIS

The present work introduces a new combination of technical tools developed to track and study surface swirls and associated "source vortices." These new tools are based on the detection of the contour of the surface swirl on high speed PIV frames using image processing and on the detection of the physical contour of swirling strength levels (S = -det J, J = [Ji,j] is the Jacobian defined by Ji,j = ∂ui/∂xj) calculated from the PIV velocity fields. The image processing allows one to track and to measure the surface swirl's characteristics. The processing of PIV velocity data permits description of the local flow associated with the surface swirl before its appearance within the laser plane. Experiments are performed in an open channel flow where a free surface shear flow is combined with a downward flow to induce occurrences of surface swirls and gas entrainment. The surface swirls, the source vortices, and their trajectories are identified in the horizontal plane at 10 mm under the free surface. This permits one to investigate the appearance and disappearance of surface swirls with the quantification of associated flows, e.g., swirls' diameters and flow circulation. The tracking tool is applied to the case where a 12.5-mm-radius half cylinder is added to the channel inlet. It highlights that the surface swirl presents an elliptical shape and describes a spiral trajectory moving from upstream to downstream compared to the suction nozzle center. The circulation increases from the source vortex to the surface swirl occurrence. It then reaches a maximum and decreases down to the circulation level of the source vortex before the disappearance of the surface swirls in the measurement plane.

CITADO POR
  1. Turankok N., Lohez T., Bazin F., Biscay V., Rossi L., Exploration of frequencies peaks observed on local wall pressure measurements by time-resolved velocity field measurements in complex flows, Experiments in Fluids, 62, 2, 2021. Crossref

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