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

Journal Article · Mon Jan 01 04:00:00 EST 1996 · International Communications in Heat and Mass Transfer

DOI:https://doi.org/10.1016/0735-1933(95)00092-5· OSTI ID:207746

Lacroix, M; Joyeux, A ^[1]

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1. Univ. de Sherbrooke, Quebec (Canada). Dept. de Genie Mecanique

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 10{sup 3} and 10{sup 6}, dimensionless wall-fluid thermal conductivity ratio {alpha} between 0.2 and 1,000.0 and dimensionless wall thickness {bar 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 {bar {alpha}}. In general, the relative heat removal contribution by conduction in the wall through the top horizontal surface {eta}{sub N} decreases with Ra while that for the bottom surface {eta}{sub S} increases. For 0.2 {le} {alpha} {le} 5.0, {eta}{sub S} is nearly independent of Ra. Moreover, for Ra {ge} 10{sup 5}, 0.2 {le} {bar {alpha}} {le} 5.0 and 0.25 {le} {bar W} {le} 1.375, {eta}{sub S} is independent of {bar {alpha}} while {eta}{sub N} tends to zero with increasing {bar {alpha}}.

• OSTI ID: 207746
• Journal Information: International Communications in Heat and Mass Transfer, Journal Name: International Communications in Heat and Mass Transfer Journal Issue: 1 Vol. 23; ISSN 0735-1933; ISSN IHMTDL
• Country of Publication: United States
• Language: English

Related Subjects

42 ENGINEERING
CAVITIES
CYLINDERS
NATURAL CONVECTION
ORIENTATION
THERMAL CONDUCTION