Paper presented to the 10th International Conference on Heat Transfer, Fluid Mechanics and Thermodynamics, Florida, 14-16 July 2014.
The heat penetration into the solid bed of rotary drums was experimentally investigated. An indirect heated rotary drum with a diameter of D=600 mm and a length L=450 mm has been used for this purpose. Temperature profiles of the gas, the drum wall and the solid bed were measured using 16 Type K thermocouples assembled on both a rotating and a fixed rod that attached inside the drum. Hence, the temperature distribution inside the solid bed was analyzed from these temperature profiles. Two different solid bed materials, steel spheres and glass beads, were used in the experiments. These materials differ in particle diameter and thermo physical properties (density, heat capacity and thermal conductivity). The rotational speed was varied from 1 to 6 rpm while the filling degree was varied from 10% to 20% to see their influence on the heat penetration in the moving solid bed.