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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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THE EFFECT OF ASPECT RATIO ON HYDRAULIC AND HEAT TRANSFER CHARACTERISTICS IN A FRACTAL MICROCHANNEL

Volume 47, Edição 1, 2020, pp. 71-84
DOI: 10.1615/InterJFluidMechRes.2019028306
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RESUMO

The effect of aspect ratio on hydraulic and heat transfer characteristics in the fractal microchannel is investigated numerically and the results are presented in this paper. In the past researches, most researchers studied the effect of channel geometry by varying the channel height for a constant channel width or varying the width for a constant height. In the present work, the effect of aspect ratio is studied by varying the channel width and depth while keeping the inlet cross-sectional area or hydraulic diameter constant. Nine microchannel heat sinks which have different aspect ratios are investigated by numerical simulation. Simulations have been conducted for various values of the inlet velocity covering 5, 6, 7, 8, and 9 m/s and aspect ratio including 1/3,1/2,1, 2, 3. The thermal and hydraulic performances of the fractal microchannels are discussed in terms of the base temperature, Nusselt number, pressure drop and thermal resistance, etc. It is indicated that the aspect ratio significantly affects the hydrodynamic and thermal characteristics of the fractal microchannel heat sink. The enhanced heat transfer is achieved by increasing the aspect ratio of the entrance. The microchannels with lower aspect ratio have bigger pressure drops. The case CCS-(1/3) has medium heat transfer performance and the worst hydraulic characteristics. The microchannel CHD-3 has a better heat transfer performance; meanwhile, it also has relatively small pressure drop.

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