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Computational Thermal Sciences: An International Journal

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ISSN Печать: 1940-2503

ISSN Онлайн: 1940-2554

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: 1.5 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 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: 0.3 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: 0.00017 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: 0.28 SJR: 0.279 SNIP: 0.544 CiteScore™:: 2.5 H-Index: 22

Indexed in

NATURAL CONVECTION IN A HORIZONTAL ANNULUS WITH AN INNER HEAT-GENERATING SOLID SQUARE CYLINDER AND AN OUTER ISOTHERMAL CIRCULAR BOUNDARY

Том 3, Выпуск 2, 2011, pp. 89-102
DOI: 10.1615/ComputThermalScien.v3.i2.10
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Краткое описание

A numerical study of two-dimensional conjugate natural convection flow and heat transfer in a horizontal annulus, formed between an inner heat-generating solid square cylinder placed concentrically inside an isothermal circular cylinder is performed. Numerical solutions of the Boussinesq equations and the solid energy equation in primitive variables are obtained on a nonstaggered (collocated) grid with a pressure correction method. Results for the dimensionless maximum solid temperature, average solid temperature, average inner boundary temperature, and average Nusselt number are obtained for the heat-generation and outer-radius−based Grashof number ranging from 104 to 109, for solid-to-fluid thermal conductivity ratio of 1, 10, 50, and 100, and aspect ratio values of 0.2 and 0.4, with air as the working medium. The streamlines and isotherms show that refraction of isotherms occurs at the solid-fluid interface. The degree of refraction is found to be higher for higher thermal conductivity ratios. Because in steady state all the heat generated is to be transferred to the outer cold boundary irrespective of the thermal conductivity ratio, the average Nusselt number is not sensitive to the thermal conductivity ratio, while the local Nusselt numbers are found to be sensitive to solid-to-fluid thermal conductivity ratio. The maximum temperature depends on the solid thermal conductivity, and hence, its determination requires the solution of the conjugate problem. The results are expected to be useful in the design of thermal systems such as spent nuclear fuel casks and underground transmission cables.

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