Natural convection heat transfer around heated cylinders inside a cavity with conducting walls

Journal Article · Wed Mar 01 04:00:00 EST 1995 · Numerical Heat Transfer. Part A, Applications

DOI:https://doi.org/10.1080/10407789508913704· OSTI ID:63005

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 around two vertically separated horizontal heated cylinders placed inside a rectangular enclosure having finite wall conductances. The interaction between convection in the fluid-filled cavity and conduction in the walls surrounding the cavity is investigated. Results have been obtained for Raleigh number Ra between 10{sup 3} and 10{sup 6}, dimensionless wall-fluid thermal conductivity ratio {bar {alpha}} between 0.2 and 1000.0, and different thermal boundary conditions. The results indicate that wall heat conduction reduces the average temperature differences across the cavity, partially stabilizes the flow, and decreases natural convection heat transfer around the cylinders. Heat removal through the vertical wall is significant even when its outer surface is insulated. The overall heat transfer coefficient for both cylinders is correlated with C Ra{sup n} for different {bar {alpha}} and thermal boundary conditions. Natural convection heat transfer around horizontal circular cylinders finds numerous practical applications in space heating, heat exchangers, solar energy collectors, energy storage systems, and electronic devices.

• Sponsoring Organization: USDOE
• OSTI ID: 63005
• Journal Information: Numerical Heat Transfer. Part A, Applications, Journal Name: Numerical Heat Transfer. Part A, Applications Journal Issue: 3 Vol. 27; ISSN NHAAES; ISSN 1040-7782
• Country of Publication: United States
• Language: English

Related Subjects

14 SOLAR ENERGY
25 ENERGY STORAGE
32 ENERGY CONSERVATION, CONSUMPTION, AND UTILIZATION
42 ENGINEERING
HEAT EXCHANGERS
NATURAL CONVECTION
SOLAR COLLECTORS
SPACE HVAC SYSTEMS
THERMAL ENERGY STORAGE EQUIPMENT