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Journal of Enhanced Heat Transfer

Published 8 issues per year

ISSN Print: 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

EXPERIMENTAL INVESTIGATION ON FLOW PATTERNS AND PRESSURE DROP OF R134A FLOW BOILING IN A HORIZONTAL HELICALLY COILED PIPE

Volume 20, Issue 3, 2013, pp. 225-233
DOI: 10.1615/JEnhHeatTransf.2013006759
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ABSTRACT

Experiments were performed to investigate the characteristics of flow boiling patterns and pressure drops of R134a in a horizontal helically coiled pipe. The test section is made of a 7.6 mm inner diameter and 10 mm outer diameter stainless steel tube, the structural parameters of which are eight coils, 300 mm coil diameter, and 30 mm pitch, which was heated directly by low-voltage and high-current direct current power supplies. The experiments were carried out under the conditions of saturation temperatures ranging from 5° to 20° refrigerant mass fluxes varying from 50 to 500 kgm−2s−1, heat fluxes varying from 5 to 20 kWm−2, and vapor qualities ranging from 0.01 to 0.9. The flow patterns were obtained through visualization experiments, and it was found that the flow patterns in the rising and declining sections of the horizontal helically coiled test pipe were somehow different under the same conditions, especially in the case of the observation of two new transition flow patterns that occurred before the formation of the annular flow; i.e., wave annular flow and super slug flow. Therefore, two different flow pattern figures have been proposed for the rising and declining sections according to different situations. The flow frictional pressure drops were experimentally determined and a new correlation has been developed to predict the flow frictional factors through the regression analysis of the experimental data.

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