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Journal of Enhanced Heat Transfer

Publicado 8 números por año

ISSN Imprimir: 1065-5131

ISSN En Línea: 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

Indexed in

Critical Heat Flux and Pressure Drop of Subcooled Flow Boiling in Small-Diameter Tubes with Twisted-Tape Inserts

Volumen 3, Edición 2, 1996, pp. 95-108
DOI: 10.1615/JEnhHeatTransf.v3.i2.30
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SINOPSIS

Critical heat flux (CHF) and pressure drop of small diameter tubes with twisted-tape inserts in subcooled flow boiling have been investigated experimentally. The influences of twisted-tape and test-section geometries (twist ratio, tube diameter and length) and fluid thermal-hydraulic conditions (mass flux, exit pressure, and inlet temperature) on both CHF and pressure drop have been analyzed and presented. Experiments were performed using stainless steel tubes with diameters ranging from 2.44 to 6.54 mm and aluminum twisted tapes (δ = 0.42 mm) with twist ratios from 1.9 to . The gap between the twisted-tape edge and the tube wall was between 0.05−0.1 mm. The experimental results show significant enhancement of stable CHF by using twisted tapes with small twist ratios. Under high-mass-flux conditions, swirl-flow CHF is shown to be inversely proportional to twjst ratio, tube diameter, inlet temperature, and length-to-diameter ratio, but directly proportional to mass flux and exit pressure. Based upon the experimental data, an empirical subcooled swirl-flow CHF correlation, covering all six parameters, is proposed for a wide range of parametric values.
Pressure drop is strongly coupled to the conditions of CHF. The studies have revealed that the heat transfer enhancement achieved by means of twisted-tape inserts is generally accompanied by an increase in pressure drop. In this study, the influences of the above six parameters and heat flux on pressure drop have been addressed. The principal parameters affecting both single- and two-phase pressure drop are twist ratio, tube diameter, length-to-diameter ratio, and mass flux.

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