Abstract
This paper presents a coupled CFD-DEM approach to simulate the process of tea fixation in a cylinder fixation equipment. We have carried out quantitative assessments of process conditions, such as rotation speed, number and height of lifter and drum tilt. The temperature and movement charatertristic of particles in the drum are obtained and analyzed. We assess the performance of our framework by employing temperature rising rate, which presents the efficiency of heat transfer between hot air and particles. An orthogonal experiment with four factors and three levels was designed, and the results show that the rotation speed and drum tilt have great influence on the temperature rising rate of tea particles, and the number and the height of lifter had little influence on the temperature rising rate. Finally, we have identified a lifter of 14 pieces and 70 cm height, a rotation speed of 20 r/min and a drum tilt of 3 degrees as a set of optimal operating conditions.
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