Influence of Different Baffle Variations on the Effectiveness of Multi‐Stage Agitated Vessels

Abstract

Die Ermittlung der Leistungskennzahl als Auslegungsparameter für mehrstufige Rührsysteme ist stark von den geometrischen Randbedingungen abhängig. Insbesondere bei axial fördernden Rührern ist aufgrund ihrer Interaktion der Abstand der Rührerebenen zueinander von Bedeutung. Des Weiteren zeigen unterschiedliche Bewehrungszustände eine Auswirkung auf den resultierenden Leistungseintrag. In der vorliegenden Arbeit wird ein mehrstufiges axiales Rührsystem systematisch untersucht. Unter Variation der Bewehrung erfolgt eine Charakterisierung hinsichtlich des Leistungseintrages sowie des Homogenisierverhaltens.

Flow Fields in Stirred Vessels Depending on Different Internal Heat Exchangers and Vessel Bottoms

“…In the beginning of the 20th century a lot of today's standard agitators have been developed and also a lot of investigations on these agitators have been done in the meantime like from Rushton , Nagata and others . Further stirring equipment, even for special mixing tasks, is developed permanently by diverse reputable companies worldwide.…”

Power consumption for an agitated vessel equipped with pitched blade turbine and short baffles

“…Kamla et al (2016) concluded that power consumption decreases with the increase in the radius of the baffle curvature for the clockwise rotational direction of the impeller. Heyter and Wollny (2017) examined the effect of different baffle variations on the agitation efficiency in the vessels equipped with axial multi-impeller system in order to determine power number. The experiments were carried out in the vessel of inner diameter D  = 0.4 m filled by the liquid up to height H  = (1–1.5) D .…”

Impact of Bioreactor Geometry on Mesenchymal Stem Cell Production in Stirred‐Tank Bioreactors

“…For axial pumping stirrers, such as pitched blade/marine impellers and 3‐SPB devices, which rely on the redirection of flow from the bottom and thus cause friction, the stirrer installation height h S,B (from the bottom) or bottom clearance C = h S,B / d S is relevant for appropriate reinforcement and design, thus influencing the power number 60, 61. Heyter et al 60 changed the bottom clearance from 0.2 to 0.56 and reported a small decrease in N P (∼7 %). In multistage systems, where bottom clearance resembles the distances between stirrers, the influence on the power number increases to 33 % 60.…”