| dc.description.abstract | Models at distinct levels have evolved by many researchers for predicting the heat transfer in rotating drums. The discrete element method (DEM) has widely used to investigate the granular system. As the main focus of the study, this work clarifies numerically by the discrete element method (DEM) simulation to examine the impact of wall friction that is denoted by the distinction of Dpw/Dp and pattern on heat transfer behavior of granular flow inside a rotating drum. In other investigations, the drum builds with two dissimilar boundaries then completed by various thermal pipe resistance. The impact of filling ratio as well investigate in this work. The drum typically applied to this work has 100 mm in diameter and 10 mm in depth. The drum arch is systematically structured by 64 segments wall 32 segment wall acquire the heat energy, while the other 32 not. Every four adjacent wall segments grabs the heat energy, and four wall segments neighboring them not. So, the drum sustains the equivalent heat energy for simulations 1, 2, and 4 (Dpw/Dp, pattern, and filling ratio). This model does not employ for the simulations on drums with different boundaries (simulation 3). Some particles are sticking in the non-heating walls in a similar pattern with various diameters from 0 to 5 millimeters later creates different ratios (Dpw/Dp). The drum is built into five models upon the same Dpw/Dp, which are pattern _1, pattern _2, pattern _3, pattern _4, and pattern 5 (simulation 2). The third simulation clarifies the second simulation before (different boundaries). 30, 60, and 90 % of filling ratios are also applied to review the average temperature of the granular matter inside the drum. Overall simulation control with 10 rpm of drum speed. The initial temperature for drum walls and particles is around 300 K. The 32 wall segments are heated sufficiently by the constant temperature of 800 K during the simulation. The heat transmits to the granular matter via an indirect heat transfer mechanism. The results exhibit the different ratios (Dpw/Dp) of the drum generating numerous average temperatures. Furthermore, the variation of patterns also affects for heat transfer behavior of granular matter inside the drum. The simulation also represents that the increase of thermal pipe resistant can reduce the heat conveyed to the particles. The last, enhance of filling ratio can decrease the average temperature of granular matter inside the drum. | en_US |