In this work, a computational model is developed to simulate heat transfer between fluidised bed and workpiece surface, based on the particle group configuration deduced by the method of minimum energy loss of gas flowing through the bed. The heat transfer flux from the surface of workpieces to fluidised beds is controlled by dense gas-solid emulsion and bubble phases, alternately. Based on the simulation results, the heat transfer mechanism is analysed. The results show that the heat transfer coefficient on the immersed surface near particle is about 6-10 times of that on other areas. The section with a high heat transfer coefficient is in the circle area with a diameter of 0.75d_p. The heat transfer between the fluidised beds and the workpiece surface is mainly contributed by the conduction in still gas film of 0.12d_p thick.
展开▼
