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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 and Friction Characteristics of Turbulent Flow in Circular Tubes with Twisted-Tape Inserts and Axial Interrupted Ribs

Том 4, Выпуск 4, 1997, pp. 297-308
DOI: 10.1615/JEnhHeatTransf.v4.i4.50
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Краткое описание

Local heat transfer distributions and pressure drop in smooth circular tubes with twisted-tape inserts and axial interrupted ribs were investigated. Experimental data for isothermal friction factors and regionally averaged Nusselt numbers are presented for turbulent air flows for Reynolds numbers ranging from 17,000 to 82,000. The circular tube is composed of ten isolated copper sections with a tube length-to-diameter ratio (L/D) of 15. Three different 360° twisted-tape ratios are studied: H/D = 6(2.5 turns), 7.5 (2 turns), and 10 (1.5 turns). Three axial interrupted rib configurations attached to the inner wall of three test tubes with twisted-tape inserts are investigated: e/D = 0.0625 in-line rib, e/D = 0.0625 staggered rib, and e/D = 0.125 staggered rib.
The results show that the heat transfer and pressure drop in the tube with twisted-tape inserts increase by increasing the number of twisted-tape turns. The tube with twisted-tape inserts provide 1.5−2.0 times the heat transfer augmentation with 3-4 times the pressure drop penalty. The tube with twisted-tape inserts and staggered ribs produce higher heat transfer and pressure drop than that with twisted-tape inserts and in-line ribs, and significantly higher than without ribs. The tube with twisted-tape inserts (H/D = 7.5) and e/D = 0.125 staggered ribs provides 1.8−2.8 times the heat transfer enhancement with about 9−10 times the pressure drop penalty. The tube with twisted-tape inserts (H/D = 6) and with staggered ribs (e/D = 0.125) gains 2.2−3.2 times the heat transfer while paying 13−14 times the pressure drop. The best heat transfer performance in the tube with twisted-tape insert and staggered ribs (e/D = 0.125) is about 25−40% higher than that with the twisted-tape only for different H/D for a constant pumping power.

ЦИТИРОВАНО В
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