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Journal of Flow Visualization and Image Processing
Главный редактор: Krishnamurthy Muralidhar (open in a new tab)

Выходит 4 номеров в год

ISSN Печать: 1065-3090

ISSN Онлайн: 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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FLOW ANALYSIS OF THE IMPINGEMENT OF A VARIABLE-DIAMETER SYNTHETIC JET

Том 26, Выпуск 2, 2019, pp. 127-148
DOI: 10.1615/JFlowVisImageProc.2019029368
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Краткое описание

Synthetic jets have been used for impingement heat transfer in compact electronics cooling. A novel form of synthetic jet uses a time-varying diameter, which can produce increased momentum flow and heat transfer when compared to fixed-diameter devices with the same average size, De. This benefit was most significant over an axial range relatively close to the exit, corresponding to nondimensional positions, x/De, from 1 to 3. Particle image velocimetry (PIV) was applied to examine the flow mechanisms behind this behavior, using both time-averaged and phase-averaged analysis. In the time average, the variable-diameter jet produces a concentrated jet with more significant entrainment, exceeding its fixed-diameter counterpart by a factor of nearly four. Over the actuation cycle, phase-averaged flow fields display a larger, more concentrated vortex ring, which increases the maximum speed, vorticity, and circulation. The vortex ring travels across the impingement distance nearly twice as fast with a variable diameter, though, so it only has an effect during a brief portion of the actuation cycle. This indicates that the device position must be selected carefully, as its benefits will be most significant when placed close to the target.

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