THERMAL SCIENCE

International Scientific Journal

Saeid Jani

,

Mostafa Mahmoodi

,

Meysam Amini

,

Jafar E. Jam

NUMERICAL INVESTIGATION OF NATURAL CONVECTION HEAT TRANSFER IN A SYMMETRICALLY COOLED SQUARE CAVITY WITH A THIN FIN ON ITS BOTTOM WALL

ABSTRACT
In the present paper, natural convection fluid flow and heat transfer in a square cavity heated from below and cooled from sides and the ceiling with a thin fin attached to its hot bottom wall is investigated numerically. The right and the left walls of the cavity, as well as its horizontal top wall are maintained at a constant temperature Tc, while the bottom wall is kept at a constant temperature Th ,with Th > Tc. The governing equations are solved numerically using the finite volume method and the couple between the velocity and pressure fields is done using the SIMPLER algorithm. A parametric study is performed and the effects of the Rayleigh number and the length of the fin on the flow pattern and heat transfer inside the cavity are investigated. Two competing mechanisms that are responsible for the flow and thermal modifications are observed. One is the resistance effect of the fin due to the friction losses which directly depends on the length of the fin, whereas the other is due to the extra heating of the fluid that is offered by the fin. It is shown that for high Rayleigh numbers, placing a hot fin at the middle of the bottom wall has more remarkable effect on the flow field and heat transfer inside the cavity.
KEYWORDS
natural convection, numerical simulation, square cavity, thin fin
PAPER SUBMITTED: 2011-06-12
PAPER REVISED: 2012-06-21
PAPER ACCEPTED: 2012-07-17
DOI REFERENCE: https://doi.org/10.2298/TSCI110612139J
CITATION EXPORT: view in browser or download as text file
THERMAL SCIENCE YEAR 2014, VOLUME 18, ISSUE Issue 4, PAGES [1119 - 1132]
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Numerical investigation of natural convection heat transfer in a symmetrically cooled square cavity with a thin fin on its bottom wall

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