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Heat Transfer Research

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ISSN Druckformat: 1064-2285

ISSN Online: 2162-6561

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: 1.7 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: 1.4 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: 0.00072 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: 0.43 SJR: 0.318 SNIP: 0.568 CiteScore™:: 3.5 H-Index: 28

Indexed in

THREE-DIMENSIONAL NATURAL CONVECTION AND ENTROPY GENERATION IN TALL RECTANGULAR ENCLOSURES FILLED WITH STRATIFIED NANOFLUID/AIR FLUIDS

Volumen 49, Ausgabe 8, 2018, pp. 685-702
DOI: 10.1615/HeatTransRes.2018020194
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ABSTRAKT

Fluid flow, heat transfer, and volumetric entropy generation due to the three-dimensional natural convection within a tall rectangular enclosure filled with two immiscible/stratified fluids have been studied comprehensively as a simplified thermal model for each cell of lead–acid batteries. The stratified fluids consist of an MWCNT–SiO2 (15%–85%)/EG nanofluid at the bottom and air in the top region of the enclosure. The Navier–Stokes equations are solved based on a three-dimensional form, and finite volume approach is utilized. The boundary condition for the interface involve heat and mass transfer and shear stress. The heated side walls have a constant heat flux, the bottom and top parts of the side walls have a symmetry condition showing the existence of similar fluid flow in the neighbor cell. The top and bottom walls are cooled by environment temperature. The three-dimensional flow structure and temperature field are obtained and analyzed at mid-depth in a two-dimensional form. Different operating parameters such as the aspect ratio (12 < AR < 120), Rayleigh number (103 < Ra < 106), and the solid volume fraction (φ = 0.005–0.02) are considered with fluid flow, heat transfer, and volumetric entropy generation. The results show that the dominant heat transfer mechanism is conduction at the tall enclosures with a high aspect ratio. Moreover, the interface between the nanofluid and air phases is acting like an insulation medium banning the heat energy to escape from the nanofluid region to the top cold wall. The Nusselt number enhances with increasing Rayleigh number and solid volume fraction. Higher volumetric entropy generation occurs at higher Rayleigh number and lower aspect ratio and solid volume fraction.

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