Abstract
Heat transfer inside a semi porous two-dimensional rectangular open cavity was numerically investigated. The open cavity comprises two vertical walls closed to the bottom by an adiabatic horizontal wall. One vertical wall is a porous and an inflow of fluid occurs normal to it. The other wall transfers a uniform heat flux to the cavity. It shows how natural convection effects may enhance the forced convection inside the open cavity. The main motivation for the work is its application for electronic equipment where frequently the devices used for the electronic equipment cooling are based on natural and forced convection. Governing equations are expressed in Cartesian coordinates and numerically handled by a finite volume method. Results are presented for both local and average Nusselt numbers at the heated wall and for the isotherms and streamlines of the fluid flowing inside the open cavity as a function of Reynolds number ranging from 1 to 100, Grashof number ranging from 0 to 10+7 and the aspect ratio number of the open cavity equal 2, 4 and 8. The results obtained show that the forced convection inside the semi-porous open cavity studied may be greatly enhanced by natural convection effects. Key words: Computational simulation, electronic equipment cooling, finite volume, natural convection, open cavity; porous media.
Highlights
The heat transfer in enclosures has been studied for a variety of engineering applications
This paper presents a continuation of work of Chaves et al (2008) using the program development in Chaves et al (2005) where numerical analysis of heat transfer was done inside a semi porous two-dimensional rectangular open cavity
In addition to the forced convection, the analysis considered the influence of natural convection effects
Summary
The heat transfer in enclosures has been studied for a variety of engineering applications. Results have been presented in research surveys (Bruchberg et al, 1976; Kakaç et al, 1987) and it has become a main topic in convective heat transfer textbooks (Bejan, 1984). The enclosures are closed and natural convection is the single heat transfer mechanism. There are several applications in passive solar heating, energy conservation in building and cooling of electronic equipment, where open cavities are employed 1985; Hess and Henze, 1984; Penot, 1982). The devices employed for the cooling of electronic equipment are based on forced convection (Sparrow et al, 1985).
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