Details

Autor(en) / Beteiligte

• Minea, Alina Adriana

Titel

Numerical studies on heat transfer enhancement in different closed enclosures heated symmetrically

Ist Teil von

• Journal of thermal analysis and calorimetry, 2015-08, Vol.121 (2), p.711-720

Ort / Verlag

Dordrecht: Springer Netherlands

Erscheinungsjahr

2015

Quelle

Alma/SFX Local Collection

Beschreibungen/Notizen

• A numerical study of heat transfer enhancement on a closed enclosure heated symmetrically from lateral walls was performed. The density-based solver in FLUENT was selected to solve the governing equations. For solving the heat transfer problem, it was chosen simulation of radiation and convection in a closed domain. One global variable, Nu, was monitored to analyze the numerical solution independence of the mesh spacing. Results were delivered in terms of relative surface heat transfer coefficient and relative air rate in the two studied enclosures: a rectangular and an oval one. Two lateral panels were inserted in the enclosure, and their position was considered as variable for the numerical study, thus leading to increasing air velocity by creating a chimney effect with a result in augmenting natural convection. Heat transfer enhancement was found to depend on natural convection increasing due to the air velocity increasing, standing on the “chimney” effect of the panels. From the simulation history, heat transfer coefficient and air rate at different locations could be easily verified, and the data were presented as a relative enhancement in comparison with the data collected for the furnace with no panels. An enhancement of about 18 % was noticed for the classic enclosure, since a higher one (of about 27 %) was registered for the oval heated enclosure. These differences are normal and are generated by the enclosure shape.