6533b7ddfe1ef96bd12735d0
RESEARCH PRODUCT
Particle Suspension in Vortexing Unbaffled Stirred Tanks
Alberto BrucatoGiorgio MicaleAlessandro TamburiniAndrea CipollinaFrancesca Scargialisubject
Settore ING-IND/26 - Teoria Dello Sviluppo Dei Processi ChimiciChromatographyMaterials scienceGeneral Chemical EngineeringSettore ING-IND/25 - Impianti ChimiciUnbaffled02 engineering and technologyGeneral ChemistryParticle suspensionMechanics021001 nanoscience & nanotechnologyIndustrial and Manufacturing EngineeringVortexImpellerStirred tank020401 chemical engineering0204 chemical engineeringAerationsolid-liquid suspensions0210 nano-technologySuspension (vehicle)Gas dispersionSpargingVortexdescription
Three-phase processes in which particle suspension has to be achieved in conjunction with gas dispersion are traditionally carried out in sparged, baffled stirred tanks. The operation of such tanks can suffer, however, from particles tending to block the sparger holes. A viable alternative might be provided by uncovered unbaffled stirred tanks (UUSTs), where gas self-injection can occur when the free-surface vortex reaches the impeller blades and gas bubbles begin to be ingested by the liquid. In this work, the particle suspension and liquid aeration performances in three-phase UUSTs were experimentally investigated and compared with relevant literature correlations concerning baffled systems. The results show that, at least at the investigated scale, UUSTs are more efficient for suspending particles than relevant baffled systems. Impeller clearance scarcely affects power requirements. Finally, a down-pumping PBT with D/T = 1/3 was found to be the best choice for attaining complete suspension under self-aeration conditions.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 2016-06-29 |