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Journal of Flow Visualization and Image Processing

年間 4 号発行

ISSN 印刷: 1065-3090

ISSN オンライン: 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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OBSERVATION OF THERMALS IN MIXED CONVECTIVE GAS FLOW OVER A MODEL HEATED SUBSTRATE

巻 15, 発行 4, 2008, pp. 301-312
DOI: 10.1615/JFlowVisImageProc.v15.i4.20
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要約

Experimental flow visualization has been carried out to investigate the characteristics of thermals and their relation to the evolution of longitudinal roll patterns in mixed convection of air over a circular heated plate mounted on the bottom of a horizontal flat duct. The results reveal that thermals with three different appearances are observed in the progression of end view flow photos, namely, the knotted thermals situated slightly beyond the onset point, the subsequent mushroom-shape thermals in the core region of the duct, and the deformed thermals located at each far side of lateral extension upon the heated plate. It is noted that on top of the heated surface, regular thermals arrange in unequal distance and lose their spanwise symmetry slightly. Moreover, the onset points of thermals all land on the circular heated disk and are in a shape of a concave downward curve in the flow direction. At higher buoyancy the generated knotted thermals unsteadily oscillate up and down and move spanwisely in the region slightly beyond the onset point which in turn results in meandering of the smoke streaks on top view accompanied by the bifurcation points of rising thermals to move back and forth in the axial direction. This explains the snaking motion proposed in the literature. Besides, coexistence and new generation of thermals are observed in the intermittent transition.

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