TY - JOUR
TI - Combined natural convection and radiation with temperature-dependent properties
AU - Cheng Tien-Chun
AU - Tseng Chung-Jen
AU - Weng Ling-Chia
AU - Wu Shih-Kuo
JN - Thermal Science
PY - 2018
VL - 22
IS - 2
SP - 921
EP - 930
PT - Article
AB - 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 (Nr), Rayleigh number (Ra), 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 Nr is decreased or Ra is increased,  the effects of temperature dependence of radiative properties become more  significant.