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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

Two-phase Flow Characteristics of Refrigerant Flows in a MicroChannel Heat Exchanger

Volumen 6, Ausgabe 6, 1999, pp. 419-427
DOI: 10.1615/JEnhHeatTransf.v6.i6.30
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ABSTRAKT

MicroChannel surfaces have been shown to be effective in thermal management of electronic components. Such channels are often 20 to 200 μm in width and depth. The large number of channels per unit width of the surface offers a significantly higher heat transfer area. A large number of variables, however, control the two-phase flow heat transfer coefficient. Specifically, the phenomenon surrounding the bubble generation plays a very important role in two-phase flow heat transport. The bubble generation, the diameter, and the frequency are functions of the channel geometry, the channel surface, and its shape. In addition, the pressure, the surface heat flux, and the mass flux affect the heat transport significantly. Experiments were conducted on a setup that was specially built for testing microchannel heat exchangers. The range of parameters considered in the study are: power input: 20 to 400 W, mass flux: 35 to 300 ml/min, quality: 0 to 0.9, inlet subcooling: 5°C. The results indicate that the heat transfer coefficient is a function of the flow quality, the mass flux, and of course, the heat flux, and the related surface superheat. The heat transfer coefficient decreases with wall superheat from a value of 12,000 W/m2-K at 10°C to 9,000 W/m2-K at 80°C. The coefficient decreases by 30 percent when the quality is increased from 0.01 to 0.65. Also, the pressure drop increases with increasing heat flux.

REFERENZIERT VON
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