Identification and Distribution Analysis of the Mid-phase in a Low-velocity Gas-solid Fluidized Bed
Abstract
The intermediate phase in low-velocity gas-solid fluidized beds generally presents excellent gas-solid contact in the systems. However, no comprehensive understanding of this vital phase is available in the literature. Therefore, this study proposed a statistical method to identify this intermediate phase, named ‘mid-phase’ in this thesis, to interpret the system performance based on the analysis of solids holdup in a low-velocity gas-solid fluidized bed.
The distributions of the mid-phase are investigated along both radial and axial directions in consideration of different flow regimes. The result shows that the turbulent regime contains a higher amount of mid-phase and the spatial mid-phase distributions within this regime present to be more heterogeneous. According to the analysis of the spatial distributions, the mid-phase tends to concentrate at the medium bed heights adjacent to the wall. These results are of great significance to precisely guide the related process intensification operations.