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Investigation on Unsteady Phase-Change Heat Transfer Characteristics of Centrifugal Granulated Particles

Abstract In this paper, the flying heat transfer characteristics of slag particles are studied in the process of the dry centrifugal granulation. When the solidification time of particle surface decreased by 66.67% at the rotational speed of 800 rpm, the total solidification time on the particle surface decreased by 55.5% and the average cooling rate increases faster in the phase transition region; When the rotating speed is increased by 87.5%, the complete solidification time on the surface of particles with different particle sizes is shortened by about 6%, and the average cooling rate is increased in the transformation region. Compared with particle size, it has little effect on heat transfer; When the air outlet angle is increased from 30° to 90°, the solidification time of particle surface increases from 0.095 s to 0.1 s; The decrease of space temperature has a great influence on shortening the time of liquid phase existence and particle solidification process. The obtained results could provide a reference for the design of granulation equipment and the adjustment and control of various parameters in the operation process in the industrial application process.