Experiment, CFD simulation and field synergy characteristics analysis of hot-air drying process in a spouted bed

Abstract

Combining experimental and simulation methods, the hot-air drying process in the spouted bed was studied from the perspective of heat and mass transfer and multiphase physical field synergy. Based on the experimental system, the rate of drying curve was determined, and a drying prediction model was established and verified. The analysis of the drying characteristics shows that the heat and mass transfer in the spouted bed mainly occurred in the center of the spouting and fountain region, followed by the annulus region, and finally on both sides of the fountain region. The dimensionless parameter σ that simultaneously considered the synergy angle of velocity-velocity gradient and velocity-pressure gradient indicated that the gas drag was mainly concentrated near the gas inlet. The synergy coefficient SC of the velocity-temperature-concentration field was more affected by the variation coefficient of the velocity-concentration field and less affected by the variation coefficient of the velocity-temperature field.