New H 2 O weighted sum of gray gases model for natural convection flows within large cavities

Abstract Radiation heat transfer plays a significant role in buoyancy driven flows for large scale facilities. In the analysis of nuclear containment safety during severe accidents, it has been found that thermal radiation particularly affects temperature distribution and pressurization due to humidity environment. order model radiation, one main challenges is description nongray gas property steam-air mixtures. The weighted sum gray gases (WSGG) reasonable method engineering applications because its computational efficiency. There are many WSGG models available combustion applications, but none them dedicated low applications. Furthermore, most existing only provide fixed partial pressure ratios (e.g., p H 2 O = CO methane). To overcome this limitation, tailored derived by Line-by-Line mixture composed arbitrary concentrations . This valid path length ranging from 0.0001 10 atm · m , 300 1200 K correlations verified against benchmark solutions with isothermal/non-isothermal temperatures homogeneous/non-homogeneous concentrations. results demonstrate ability efficiency new formulation.