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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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NORMAL EMISSIVITY MODEL OF NICKEL-COBALT ALLOYS AT AN ELEVATED TEMPERATURE IN AIR AND AT 1.5 μm

Volume 51, Edição 8, 2020, pp. 781-796
DOI: 10.1615/HeatTransRes.2020031943
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RESUMO

Normal emissivity of nickel-cobalt alloys was measured at temperatures from 800 to 1100 K and at 1.5 μm. When we measured the emissivity, nickel-cobalt specimens were heated to a given temperature and then maintained at that temperature for at least 6 h. To obtain the normal emissivity varying with the thickness of oxidation film at a definite temperature as accurately as possible, the temperature of nickel-cobalt specimens was determined by two thermocouples. The two thermocouples were symmetrically welded onto the front surface of nickel-cobalt specimens. Eleven analytical functions were employed to evaluate the normal emissivity of nickel-cobalt alloys varying with temperature at a definite heating time and its normal emissivity varying with heating time at a given temperature. The influence of the total number of variables in the emissivity analytical models on the fitting quality was investigated. As a conclusion, the fitting quality of normal emissivity could be improved generally by adding the variables to the analytical functions. As a whole, almost all analytical models with four variables can reproduce well the experimental results, whether for a definite heating time or temperature, whereas the analytical models with five variables can reproduce better the measurements. A strong oscillation of emissivity at each temperature was observed. It can be explained by the effect of interference between two optical radiations: one radiation is from the oxide film of specimens; the other coming from the substrate of samples.

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