Coupling of wall conduction with natural convection from heated cylinders in a rectangular enclosure

✍ Scribed by Marcel Lacroix; Antoine Joyeux

• Publisher: Elsevier Science
• Year: 1996
• Tongue: English
• Weight: 358 KB
• Volume: 23
• Category: Article
• ISSN: 0735-1933
• DOI: 10.1016/0735-1933(95)00092-5

✦ Synopsis

A numerical study has been conducted for natural convection heat transfer for air from two vertically separated horizontal heated cylinders confined to a rectangular enclosure having vertical walls of finite conductances and horizontal walls at the heat sink temperature. The interaction between convection in the fluid filled cavity and conduction in the vertical walls is investigated. Results have been obtained for Rayleigh numbers, Ra, between 103 and 106 , dimensionless wall-fluid thermal conductivity ratio ~ between 0.2 and i000.0 and dimensionless wall thickness W between 0.25 and 1.375. Results indicate that the Nusselt number along the vertical wall-fluid interface is a complex function of both Ra and ~. In general, the relative heat removal contribution by conduction in the wall through the top horizontal surface rl~ decreases with Ra while that for the bottom surface rls increases. For 0.2 < c~ < 5.0, rls is nearly independent of Ra. Moreover, for Ra > 105, 0.2 < ~" < 5.0 and 0.25 _< W < 1.375, rls is independent of c~ while rl~ tends to zero with increasing c~.