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The simulation of engineering research is difficult, especially the engineering problem of the large differences between the size of the equipment and materials processed. At present, two methods are used to solve this problem, i.e. the equal scale reduction model and the study of only a part of it, which makes it inconsistent with the actual situation. To find a better way to improve this problem, the multi-scale is introduced. In this study, the heat transfer of the particles in a drying drum with engineering size is studied by multi-scale and fluid-solid coupling methods. The general situation of the drying drum is introduced, and the fluid-solid coupling mechanism based on multi-scale is established. A method of establishing a particle micro model is proposed. The feasibility of this method is proved by simulation and experiment, and the accuracy of the proposed model is improved by 15.62% compared with the traditional model.

Heat Transfer of Aggregate in a Drying Drum Based on the Multi-Scale Model and Fluid-Solid Coupling