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ISSN Online: 2377-424X

ISBN Print: 0-85295-345-3

International Heat Transfer Conference 10
August, 14-18, 1994, Brighton, UK

NATURAL CONVECTIVE FLOW AND HEAT-TRANSFER IN A SQUARE ENCLOSURE WITH A HORIZONTAL PARTITION

Get access (open in a dialog) DOI: 10.1615/IHTC10.3510
pages 19-24

Sinopsis

An oscillatory motion of the natural convective flow in a two-dimensional, partially divided square enclosure heated from below, and fitted with a partition is investigated numerically. The enclosure is composed of the lower hot and the upper cold horizontal walls and the adiabatic vertical side walls, and a partition is positioned perpendicularly in the middle of the one adiabatic vertical wall. The governing equations are discretized by using the finite element method with Galerkin formulation. The computations were performed with the variation of the partition lengths, and the Rayleigh numbers based on the temperature difference between horizontal walls with water(P r= 4.95) as a working fluid. Periodic oscillating flows were observed above the critical Rayleigh number. Also, the effect of the inclination angle was studied for the oscillating flow. The intensity and the frequency of oscillatory motion was significantly affected by the Rayleigh number and the partition length. An unsteady periodic oscillatory motion caused a sudden rise of overall heat-transfer rate, but the increase in partition length significantly restrained the increase of Nusselt number. The critical inclination angle for transition from unsteady oscillatory flow to steady circulatory flow increased with the increase of the Rayleigh number and the partition length. The relation between frequency of the oscillatory motion and heat-transfer rate has been also studied.