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Journal of Enhanced Heat Transfer
Главный редактор: Zhixiong Guo (open in a new tab)
Founding Advisory Editor: Arthur E. Bergles (open in a new tab)
Редактор-основатель: Ralph L. Webb (open in a new tab)

Выходит 8 номеров в год

ISSN Печать: 1065-5131

ISSN Онлайн: 1563-5074

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: 2.3 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: 1.8 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: 0.2 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: 0.00037 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: 0.6 SJR: 0.433 SNIP: 0.593 CiteScore™:: 4.3 H-Index: 35

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Heat Transfer Enhancement in Rectangular Channels with Concavities

Том 6, Выпуск 6, 1999, pp. 429-439
DOI: 10.1615/JEnhHeatTransf.v6.i6.40
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Краткое описание

The present study evaluates an innovative approach for enhancement of surface heat transfer in a channel using concavities, rather than protruding elements. Serving as a vortex generator, a concavity is expected to promote turbulent mixing in the flow bulk and enhance the heat transfer. Using a transient liquid crystal imaging system, local heat transfer distributions on the surfaces of cavities roughened by staggered arrays of concavities have been obtained, analyzed, and compared. Two different shapes of concavities were evaluated, i.e., hemispheric and tear-drop shaped. The results reveal that both concavity configurations induce a heat transfer enhancement about 2.5 times their smooth wall counterparts for 10,000 < Re < 50,000. Such a level of enhancement is similar to that of typical rib turbulators with a pitch-to-height ratio around 10 and aligned normal to the bulk flow direction. In addition, both concavity arrays reveal remarkably low pressure losses that are nearly one-half the magnitudes incurred with the rib turbulators. In compact heat exchanger applications, the concavity approach is particularly attractive in reducing cooling system pressure losses and component weight.

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