Combined natural convection and radiation heat transfer in a vertical air cavity with hexagonal honeycomb core of negligible thickness

Conference · Sun Dec 31 04:00:00 EST 1995

OSTI ID:516817

Asako, Y; Yamaguchi, Y; Chen, L ^[1]; Faghri, M ^[2]

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1. Tokyo Metropolitan Univ. (Japan). Dept. of Mechanical Engineering
2. Univ. of Rhode Island, Kingston, RI (United States). Dept. of Mechanical Engineering and Applied Mechanics

Combined natural convection and radiation heat transfer in a vertical air cavity with a hexagonal honeycomb core of negligible thickness are investigated numerically. The numerical methodology is based on an algebraic coordinate transformation and finite volume technique. Temperature of the honeycomb core wall is determined such that radiation, convection and conduction energy balances on the core wall are satisfied. The computations were performed for Ra = 10{sup 3} to 10{sup 5}, for an aspect ratio of H/L = 1, for Pr = 0.7, and for wide range of emissivities. Heat transfer rates by both convection and radiation are presented as a function of emissivity, and the effect of radiation on the natural convection is discussed. The results showed natural convection is affected by radiation although the layer is filled with a transparent gas. This effect is accentuated in the case of a very thin wall.

• OSTI ID: 516817
• Report Number(s): CONF-950828--; ISBN 0-7918-1704-0
• Country of Publication: United States
• Language: English

Related Subjects

42 ENGINEERING
CAVITIES
EMISSIVITY
HONEYCOMB STRUCTURES
NATURAL CONVECTION
NUMERICAL ANALYSIS
RADIANT HEAT TRANSFER