Evaluation on the effect of conical geometry on flow behaviours in spouted beds

Abstract

Evaluation on the effect of conical section geometry on the gas–solid flow behaviours in conical–cylindrical spouted beds were carried out by three‐dimensional computational fluid dynamics (CFD) coupling with two‐fluid model (TFM). The simulations were implemented in seven columns with their conical angles ranging from 30° to 180°. The solid flow pattern, particle velocity, voidage, fountain height and the spout diameter were investigated. It was found that unstable spouting would occur when the conical angle is less than 30°. In addition, the conical angle of 105° might be a borderline value for gas–solid flow behaviours in the spout. In this region, increasing conical angle leads to a decrease in fountain height, particle velocity and voidage and an increase in the spout diameter when the conical angle is within 105°, while reverse trends could be found when the conical angle is beyond 105°. The smallest fountain height, particle velocity and voidage and largest spout diameter could be found when the angle is 105°. In spite of these, the particle velocity in the annulus continually increases with increasing conical angle.

CFD Study of hydrodynamic and heat transfer in a 2D spouted bed: Assessment of radial distribution function

“…They showed that conical angle in spouted beds is a critical parameter in appearance of unstable spouting. Liu et al [48] also showed that unstable spouting would occur when the conical angle is less than 30°by CFD tool.…”

Modelling of Spouted and Spout-Fluid Beds: Key for Their Successful Scale Up

“…Liu and colleagues [236] assessed the influence of the conical base angle on the spouting regime; they found out that the spouting was unstable for angles inferior to 30 • , and that the fountain height and spout diameter had a maximum angle of 105 • . Also, the velocity of particles in the annulus kept increasing as the angle was further increased.…”

“…Gidaspow [154] 17 [25,91,[204][205][206][208][209][210]213,218,220,222,226,228,229,234,235] Syamlal-O'Brien [158] 14 [89,90,92,114,203,207,214,215,224,225,[230][231][232]236 Turbulence was not extensively discussed in most works and when considered, the k-ε turbulence model [239] was mostly employed. As it can be seen in Table 9, almost half of the works did not include a turbulence model.…”

Effect of Operating Parameters on Gas‐Solid Hydrodynamics and Heat Transfer in a Spouted Bed

“…The effect of IA of the spouted bed was previously evaluated on the flow behavior , . In the current simulation, the effect of IA on temperature evolution in a spouted bed is further explored.…”