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Journal of Flow Visualization and Image Processing

Published 4 issues per year

ISSN Print: 1065-3090

ISSN Online: 1940-4336

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: 0.6 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: 0.6 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: 0.00013 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: 0.14 SJR: 0.201 SNIP: 0.313 CiteScore™:: 1.2 H-Index: 13

Indexed in

VISUALIZATION STUDY OF VAPOR FORMATION DURING POOL BOILING UNDER MODIFIED CONFINEMENT SURFACES

Volume 23, Issue 1-2, 2016, pp. 117-136
DOI: 10.1615/JFlowVisImageProc.2017020783
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ABSTRACT

Understanding and predicting the effects of confinement on pool boiling is important for increasing the power density of electronic systems using two-phase, thermosyphon cooling systems. In comparison with spherical bubble formation in unconfined pool boiling, the presence of a confining surface near the heated surface will result in the formation of deformed/elongated bubbles. The present visualization study investigates the effects of confinement through high resolution, still photography taken from underneath a transparent heater test surface. The heater was comprised of an ITO-coated, glass substrate. Saturated pool boiling experiments using a dielectric refrigerant, RE347mcc (HFE-7000), were performed at atmospheric pressure for a flat, upward-facing surface. Unconfined tests were performed as a baseline, and three confining surfaces were tested: a plain surface, a surface with a rib, and a surface with relief holes drilled in it. The visualization study shows details of vapor structures growing underneath the confinement surfaces and escaping around the edges of the confinement surfaces. As the vapor escapes the confining surface, incoming liquid is drawn in to replenish the heater. The incoming liquid would occasionally displace any pre-existing vapor pockets, resulting in finger-like structures forming within vapor pockets. In some cases, a growing vapor pocket would initiate during the liquid replenishment, adjacent to existing vapor pockets. The newly formed and expanding vapor pocket was found to displace the surrounding liquid and the pre-existing vapor pockets. As heat flux is increased, the size and shape of the large vapor structure changes as well as the wetted area between the structures. For the plain surface, a vapor layer was observed on the test surface at a heat flux of 5 W/cm2 while the rib and drilled surfaces remained wetted.

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