A numerical study on gas-to-particle and particle-to-particle heat transfer in a conical fluidized bed reactor

In this present study, the particle behavior and heat transfer coefficients for particle-gas and particle-particle re found by using a computational model in a fluidization process. A conical shape is selected as a reactor due to its wide ange of applications. The equations describing gas and particle motions and heat transfer are solved by using the Eulerian two-fluid approach. Glass bead particles of two different sizes (2 mm and 4 mm) are used as bed materials, and the air is used as a fluidized gas. The velocity of the gas inlet is varied from 1.3 m/s to 2.6 m/s. The results demonstrate that the particle-gas eat transfer coefficient according to the velocity of the air inlet reaches its maximum value around 2.1 m/s, then decreases thereafter. Besides, at the same velocity, the particle-particle heat transfer coefficient reaches its maximum value, then decrease thereafter with increasing the velocity of the inlet air.