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Three-dimensional numerical study of the effect of heating sources dimension on natural convection in a cavity submitted to constant heat flux


Veröffentlichungsart
Begutachtete Publikation

Fakultät/Einrichtung
Natur und Technik

Institutszugehörigkeit
Julius Robert Mayer - Institut für Energietechnik
http://www.hs-bremen.de/internet/de/forschung/einrichtungen/jrmi/

Verfasser
Smolen, Slawomir, Prof. Dr.-Ing.
Belarche, Lahoucine
Abourida, Btissam

Autor_innen, Jahr, Titel
Slawomir Smolen
Three-dimensional numerical study of the effect of heating sources dimension on natural convection in a cavity submitted to constant heat flux
2013

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Anmerkung
Introduction:
The problem of electronic components cooling is often encountered in practical devices. In fact, in thermal control of electronic systems, a careful attention is necessary to ensure an optimal evacuation of the heat
surplus. Natural convection represents a simple and low cost mode of cooling, especially for low gradients temperature. Besides this application, natural convection process is also encountered in many practical cases, like solar collectors, buildings design, radiators…. Hence, the problem of natural convective heat transfer in enclosures has been studied extensively. A comprehensive review of this topic is given by Bejan and Goldstein for different combinations of geometrical and thermal imposed conditions. However, in most of these works, the studied configurations are two dimensional cavities, partially heated, with one or more heating portions. Few works has considered the three-dimensional natural convection which gives a more realistic presentation of the fluid motion and the heat exchange within the cavity.
Hence, the purpose of the present investigation is to study numerically the fluid flow and heat transfer induced by two heat sources embedded on the left vertical wall of a cubical cavity and submitted to constant heat flux q". The rest of the considered wall is adiabatic while the temperature of the opposite vertical wall is maintained at a uniform cold temperature Tc. The governing parameters are the Rayleigh number Ra (103 £ Ra £ 107) and the heating sections dimension ɛ = D / H (0.15 £ ɛ £ 0.35). The Prandtl number and the aspect ratio Ax = H / L are fixed respectively to 0.71 and 1.



 

 

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