| Abstract: | Abstract For impingement stream drying, it is important to understand the complex gas-particle flow field in order to control the quality of dried products accurately. Hence a numerical analysis of three-dimensional gas-particle flow field was carried out including momentum, heat and mass transfers between the two phases. Simulation results for millet drying in a vertical impingement chamber were obtained and discussed. There is a great difference between gas phase and particle phase flow fields. The impingement planes of gas phase and particle phase are not coincident along the axial direction. Not all the millet particles can be taken away by the gas flow leaving some wet particles in impingement chamber for a prolonged drying. The temperature of millet rises up quickly approaching the value of drying medium in some zones. Consequently, it is important to regulate the inlet gas temperature for drying of thermal sensitive materials. |
