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Computational Thermal Sciences: An International Journal
ESCI SJR: 0.244 SNIP: 0.434 CiteScore™: 0.7

ISSN Imprimer: 1940-2503
ISSN En ligne: 1940-2554

Computational Thermal Sciences: An International Journal

DOI: 10.1615/ComputThermalScien.2016018660
pages 567-582

EVALUATION OF TURBULENCE MODELS FOR NATURAL AND FORCED CONVECTION FROM FLAT PLATES

Ahmed Kalendar
Department of Mechanical Power and Refrigeration, College of Technological Studies-PAAET, Shuwaikh, Kuwait
Abdulrahim Kalendar
Department of Mechanical Power and Refrigeration, College of Technological Studies-PAAET, Shuwaikh, Kuwait
Yousuf Alhendal
Department of Mechanical Power and Refrigeration, College of Technological Studies-PAAET, Shuwaikh, Kuwait

RÉSUMÉ

Because forced and natural convective flows over relatively wide flat plates have been widely studied, there are many empirical equations available to estimate the heat transfer rates in such situations. However, it is not clear which turbulence model should be used when numerically calculating the heat transfer rate in situations involving laminar, transitional, and turbulent flows. Furthermore, because of the differences among the results given by the various available empirical correlation equations, the selection of a turbulence model and the estimation of the accuracy of numerical results can be rather difficult. Laminar, transitional, and turbulent natural and forced convective heat transfer from isothermal and constant surface heat flux plates has been considered. It has been assumed that the flow is steady, and symmetrical about the center plane of the plate. The governing equations have been numerically solved using the commercial CFD code FLUENT. Results have only been obtained for a Prandtl number of 0.7. Rayleigh numbers between 106 and 1012, heat flux Rayleigh numbers between 107 and 1015, and Reynolds numbers between 103 and 107 have been considered. Numerical results for natural and forced convective flows have been obtained using six turbulence models and the numerical results have been compared with the results given by existing empirical equations in the different flow regions considered. These available data made it possible to establish new reliable correlations for natural convective heat transfer in transitional flow regions.


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