Experimental and Numerical Analysis on Surface-to-Bed Heat Transfer in Bubbling Fluidised Bed

This work analyses the correlation between external heat transfer and fluid dynamic field near a surface immersed in a bubbling fluidised bed through a simplified model and detailed DEM-CFD simulations. The study is based on experimental results on surface-to-bed heat transfer between a fluidised bed at bubbling and slugging regime and two heat transfer probes with spherical and cylindrical shape. The model estimations and the DEM-CFD simulations have been compared in terms of estimated values of averaged surface void fraction εw. The two approaches give similar results for the case of the sphere while the value of εw for the cylinder deduced by numerical simulations appears to be underestimated.