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This paper investigates the effects of temperature dependence of radiative properties of a medium on radiation and natural convection interaction in a rectangular enclosure. The radiative transfer equation is solved using the discrete ordinates method, and the momentum, continuity, and energy equations are solved by the finite volume method. Effects of the conduction-to-radiation parameter, Rayleigh number, and optical thickness are discussed. Results show that temperature dependence of radiative properties affects the temperature gradient, and hence the energy transport even in relatively weak radiation condition. On the other hand, temperature dependence of radiative properties has relatively insignificant effects on convection characteristics, even though it does affect the way that energy transfers into the system. As conduction-to-radiation parameter is decreased or Rayleigh number is increased, the effects of temperature dependence of radiative properties become more significant.

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This paper applies a commercial field-model code, CFX, to predict the ISO 9705 compartment fires for three different ventilation rates. The predicted results generally agree well with the corresponding experimental data. The ventilation intensity changes the flow path of entrained air and flow structure on the doorway plane to affect the fire structure inside the compartment and mass flow rate across the doorway. There exist many recirculation cells in the compartment to facilitate the mass and heat transfer. The temperature stratification phenomenon is found away from the burner. The thinnest hot layer is observed in the ventilation rate of 2 kg/s.