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Journal of Enhanced Heat Transfer

Erscheint 8 Ausgaben pro Jahr

ISSN Druckformat: 1065-5131

ISSN Online: 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

Pool Boiling of Refrigerants R-134a and R-404A on Porous and Structured Tubes Part I. Visualization of Bubble Dynamics

Volumen 13, Ausgabe 1, 2006, pp. 65-84
DOI: 10.1615/JEnhHeatTransf.v13.i1.50
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ABSTRAKT

This is the first part of a two-part experimental work that is intended to provide a further understanding of the physical phenomenon for refrigerants R-134a and R-404A boiling on structured and porous tubes. This paper provides detail visualization results for bubble formation characteristics on smooth and enhanced tubes.
The experimental observation results support the existence of flooded and suction-evaporation modes on structured tubes. Under low heat-flux conditions, the boiling mechanism is in the flooded mode. Bubbles generated from the sub-tunnel surface of structured tubes are similar to those generated from a smooth tube surface. Most of the bubbles joined together inside the tunnel to form large bubbles, moved up to the upper part of the sub-tunnel, and departed from the surface through the so-called active pores. The other bubbles passing through the pores directly are the small bubbles. Under high heat-flux conditions, the boiling mechanism transforms to the suction-evaporation mode. A thin liquid film evaporated in the tunnel and bubbles ejected from the structured pores. There are no small bubbles passing through the pores in this situation.
In a porous tube, because of a large variety of pore sizes, the bubble density is very high even though under low heat-flux conditions. However, the ratio of the bubble density to the number of pores for the porous tube is lower than that of structured tubes B and TX. This means that most of the pores on the porous tube are not active and require further improvement.

REFERENZIERT VON
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  6. Su Ching-Yuan, Yang Chien-Yuh, Jhang Bo-Wei, Hsieh Yu-Ling, Sin Yu-Yu, Huang Cheng-Chun, Pool Boiling Heat Transfer Enhanced by Fluorinated Graphene as Atomic Layered Modifiers, ACS Applied Materials & Interfaces, 12, 9, 2020. Crossref

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