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Proceedings of CHT-08 ICHMT International Symposium on Advances in Computational Heat Transfer
May, 11-16, 2008, Marrakesh, Morocco

DOI: 10.1615/ICHMT.2008.CHT


ISBN Print: 978-1-56700-253-9

ISSN: 2578-5486

2D TRANSIENT NATURAL CONVECTION GENERATED BY ISOTHERMAL ACTIVE WALLS IN PARALLELOGRAMMIC ENCLOSURES

page 11
DOI: 10.1615/ICHMT.2008.CHT.1970
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RESUMO

The present work deals with the 2D transient natural convection flows occurring in air-filled closed parallelogrammic cavities. Such cavities consists of four adiabatic walls forming a square cross-section duct (channel) closed by two vertical isothermal walls. The distance between these active vertical walls is L, both have the same height H and are maintained at temperatures Th and Tc respectively. The top and bottom passive walls of the channel are inclined at an angle a respect to the horizontal. This angle can be either negative (hot wall above the cold wall) or positive (hot wall below the cold one). Convective heat transfer is weakened in configurations with negative angles and favoured in those with positive ones. This type of cavities can be useful in several engineering fields. In the present study, it is applied to the thermal regulation of electronic devices. We consider an aspect ratio A=L/H=1.0, a temperature difference ΔT=ThTc=15°C and several inclination angles α varing between −60° and +60°. The main objective of the present work is to examine the temporal evolution of the maximum values of temperature, velocity and local Nusselt number in order to assure a correct operation of the electronic device. The numerical simulation carried out through the finite volumes method provides the convective thermal and dynamical fields. These distributions are presented at several representative times for diverse geometric configurations. The numerical analysis is complemented with some experimental measurements.

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