A 2-D model for the slag flow simulation in an entrained flow gasifier has been developed. In addition tomass, momentum and energy conservation equations, volume of fluid (VOF) equation was solved to track theliquid-gas interface. Liquid phase consists of melted coal ash particles which deposits on the wall and movedownward. The gasification reaction is not considered here but it is postulated to have a mass flow throughthe interface towards the mass of the liquid phase. The reactor walls are usually kept cold so a temperaturegradient and then a solid layer form within the slag layer. The solidification and its effect on the slag layerthickness are also considered here. Results show that, depending on the ash composition which determines thefluid’s rheological properties, the solid phase constitutes a large part of the slag layer
