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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

Indexed in

MICRO-BUBBLES/FLIP-FLOP FLOW MIXED EFFLUX FROM A DIAMOND-SHAPED CYLINDER BUNDLE

Volumen 14, Edición 3, 2007, pp. 305-315
DOI: 10.1615/JFlowVisImageProc.v14.i3.40
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SINOPSIS

An experimental study is performed to generate micro-bubbles in the flow passages inside a diamond-shaped cylinder bundle from a pair of tiny holes for supplying air drilled at each of the edge sections between two adjacent cylinders (corresponding to the intersection of the converging- and diverging-flow regions), being induced by the ramming effect. Meanwhile, a flip-flop flow oscillation (a self-excited switching flow phenomenon) is produced at the exit from the cylinder bundle that exhibits multiple, uniform-flow rate jet streams, resulting in a mixed efflux of micro-bubbles and flip-flop flow. Both Coulter Multisizers II and III are employed in monitoring micro-/nano-bubbles in the efflux from the diamond-shaped cylinder bundle. A digital microscopic camera is used for successful visualization photographing of micro-bubbles. Experiments are conducted for the Reynolds numbers ranging from 5000 to 8000 defined based on the flow speed and gap between the edges of two adjacent cylinders as the characteristic velocity and length, respectively. Results are obtained for the number versus diameter of micro-bubbles which are affected by a combined effect of the surface tension, the diameter of tiny holes, and the air supply pressure through the hole, while the Reynolds number plays only a minor role. Most interesting is the occurrence of electrification accompanied by the bursting of micro-bubbles that behave as negative ions. This phenomenon is in accord with electrification accompanying the bursting of bubbles in water and dilute aqueous solutions as reported in the existing literature, which is quoted in the text.
Forced production of micro-bubbles can achieve an efficient supply of oxygen to biological cultivations, enhancement of physiological activity, acceleration of growth of aquamarine, purification of water quality through strengthening micro-biological activity, promoting blood flow in human body, enhancement of chemical reaction, bacteria killing.

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