Chemical Engineering Journal, Vol.350, 971-981, 2018
On the hydrodynamics of a pseudo two-dimensional two-zone gas-solid fluidized bed
The hydrodynamics of a pseudo 2-dimensional two-zone fluidized bed reactor has been studied using both experimental and numerical techniques. In the experimental section a coupled Particle Image Velocimetry (PIV) and Digital Image Analysis (DIA) technique was employed to obtain the averaged particle circulation pattern, bubble dynamics, bed surface fluctuations and the average bubble induced void fraction. To obtain more insight about the hydrodynamics of these fluidized bed types the Eulerian-Eulerian approach was adapted in the numerical section. The results show an alternative reciprocating trend in the bed surface in the left and right sides of the fluidized bed. It was shown that this reciprocating trend originates from two main reasons: the presence of the cavities (small bubbles) below the nozzle tips and the gas hydrodynamics inside the T-shape nozzle. Finally, the average particles circulation patterns, average solid concentration and the granular temperature variation were studied.