Macroscopic and microscopic flow characteristics of particles in a sound assisted bubbling fluidized bed

Abstract

Sound field assisted fluidized bed is a promising approach to regulate particle behaviors in gas-solid two-phase flows. In this study, an acoustic model was built and coupled with Euler-Euler two-fluid model to study macroscopic and microscopic flow characteristics of Geldart-A particles. The influence of acoustic frequencies and sound pressure levels on particle behavior was analyzed. The sound field has little influence on the macroscopic flow characteristics of the particles, but a significant influence on the microscopic characteristics. With the increasing acoustic frequencies and sound pressure levels, the bubble granular temperature at the top of the fluidized bed decreases, and the periodicity of it is becoming irregular. Particle granular temperature increases with the increasing acoustic frequencies and sound pressure levels. In the near wall region, the sound field affected the particles to a smaller extent. This study provides a reference for exploring the sound-field regulation of particles and bubble behaviors.