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Journal of Enhanced Heat Transfer
Founding Advisory Editor: Arthur E. Bergles (open in a new tab)

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

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Prediction of Sliding Bubble Velocity and Mechanism of Sliding Bubble Motion along the Surface

Volumen 17, Edición 2, 2010, pp. 111-124
DOI: 10.1615/JEnhHeatTransf.v17.i2.10
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Jianjun Xu
CNNC Key Laboratory on Nuclear Reactor Thermal Hydraulics Technology, Nuclear Power Institute of China, Chengdu 610041, PR China
Bingde Chen
National Key Laboratory of Bubble Physics & Natural Circulation, Nuclear Power Institute of China, 610041, P. O. Box 622-205, Chengdu City
Xiaojun Wang
National Key Laboratory of Bubble Physics & Natural Circulation, Nuclear Power Institute of China, 610041, P. O. Box 622-205, Chengdu City

SINOPSIS

Sliding bubbles play an important role in heat transfer enhancement, the mechanism of sliding bubble motion along the surface is required for further comprehension in order to develop reliable heat transfer mechanism models. The momentum equation on a single sliding bubble in the x-direction is built on the analysis of the balance of forces, in which the sliding bubble velocity is obtained by a numerical method, and it is compared with the experimental data of Maity [2000]. The predicted results show that the sliding bubble velocity increases with time. The sliding bubble velocity for horizontal flow boiling is lower than that of local liquid at the sliding bubble center of mass when the bubble just lifts off the surface, whereas the sliding bubble velocity for vertical flow boiling is higher than that of bulk liquid when the bubble just lifts off the surface. The mechanism of sliding bubble motion along the surface can be explained by the analysis of forces in the x-direction, which indicates that the main forces controlling the sliding bubble motion are the buoyancy, quasi-steady drag force, and added-mass force. However, since there is lack of the driving force in the y-direction to lift the bubble from the surface for pool and vertical flow boiling, it is probable that the inertia of the liquid flow beneath the bubble base due to the change in the bubble shape is the driving force to lift the bubble from the surface.

PALABRAS CLAVE: boiling, sliding bubble velocity, lift-off, force
CITADO POR

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  2. Xu JianJun, Chen BingDe, Huang YanPing, Yan Xiao, Yuan DeWen, Experimental visualization of sliding bubble dynamics in a vertical narrow rectangular channel, Nuclear Engineering and Design, 261, 2013. Crossref

  3. Yan Libo, Li Huixiong, Li Liangxing, Wu Chao, Bubble behavior of flow boiling in horizontal rectangular channels with inclined ribs, International Journal of Heat and Mass Transfer, 75, 2014. Crossref

  4. Jianjun Xu, Tianzhou Xie, Bingde Chen, Wei Bao, Bubble Dynamics in a Narrow Rectangular Channel, in Principles and Applications in Nuclear Engineering - Radiation Effects, Thermal Hydraulics, Radionuclide Migration in the Environment, 2018. Crossref

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