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Heat Transfer Research

Publicou 18 edições por ano

ISSN Imprimir: 1064-2285

ISSN On-line: 2162-6561

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: 1.7 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: 1.4 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: 0.00072 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: 0.43 SJR: 0.318 SNIP: 0.568 CiteScore™:: 3.5 H-Index: 28

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FLOW AND HEAT TRANSFER IN HYDROPHOBIC MICRO PIN FINS WITH DIFFERENT CONTACT ANGLES

Volume 50, Edição 8, 2019, pp. 799-820
DOI: 10.1615/HeatTransRes.2018026041
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RESUMO

Hydrophobic micro pin fin heat sinks with contact angles θ = 99.5°, 119.5°, and 151.5° were prepared by solidifying hydrophobic layers containing nanoparticles on the surfaces immersed in flow, and the pressure drop, friction factor f, and the Nusselt number in hydrophobic micro pin fins were experimentally measured with liquid water as a working fluid. The friction factor reduction ratio df_coe and the Nu-reduction ratio dNu_coe in hydrophobic micro pin fins with different contact angles were obtained based on measurements, and the performing efficiency of heat transfer enhancement was analyzed in micro pin fins with different contact angles. The results demonstrated that the flow resistance was reduced apparently due to the hydrophobic surfaces, and the maximal value of df_coe in micro pin fins with θ = 99.5°, 119.5°, and 151.5° reached 0.52, 0.65, and 0.79, respectively. However, the Nu number in micro pin fins was also reduced due to the hydrophobic surfaces, and the reduction ratio of the Nu number became large with increase of the Re number at first and then became a constant value. Although heat exchange in micro pin fins was influenced by the hydrophobic surfaces, the comprehensive performance was improved over 100% in micro pin fins with θ = 99.5°, 119.5°, and 151.5° compared with the plain micro pin fins at a high heating load.

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