Flow Field Characteristics and Energy Injection in a Tank Stirred by Regular and Fractal Blade Impellers

Steiros, Konstantinos; Bruce, Paul J.; Buxton, O. R. H.; Vassilicos, J. C.

doi:10.1007/978-3-319-30602-5_46

Cited by 2 publications

(2 citation statements)

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“…1,39,40,48,53 It should be noted that the impeller geometry used in this work is different from impeller configurations extensively examined in the past, such as the commonly used RT 1,22,40 or four-blade FBT. 7,54 For an unbaffled configuration as in this work, Alcamo et al investigated the flow produced by a RT for Re ¼ 30, 000 and found maximum values of radial component, u r =u tip ¼ 0:22 and turbulent kinetic energy k 0 =u 2 tip ¼ 0:05 close to those found in the current work. 1 The work of Steiros et al with an octagonal unbaffled tank and a four blade FBT was denoted by higher levels of turbulence (turbulence intensity…”

Section: Velocity and Turbulence Datasupporting

confidence: 81%

“…Average velocity and TKE values were compared with previously published results for all reactor configurations studied, including baffled and unbaffled 1,39,40,48,53 . It should be noted that the impeller geometry used in this work is different from impeller configurations extensively examined in the past, such as the commonly used RT 1,22,40 or four‐blade FBT 7,54 . For an unbaffled configuration as in this work, Alcamo et al investigated the flow produced by a RT for

Re = 30,000

and found maximum values of radial component,

u_{r} / u_{tip} = 0.22

and turbulent kinetic energy

k^{'} / u_{tip}^{2} = 0.05

close to those found in the current work 1 .…”

Section: Resultsmentioning

confidence: 90%

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Study of trailing vortices and impeller jet instabilities of a flat blade impeller in small‐scale reactors

2022

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The design of economically feasible and profitable production processes has driven companies toward integrated continuous manufacturing by reducing working volumes and increasing operating frequencies. Thus, the development of robust smallscale devices capable of multivariate process optimization is essential. The aim of this work is to characterize the flow developed in a ml-scale stirred tank operating at intermediate Re $3732, and assess trailing vortex stability with respect to baffle presence and size. Velocity characteristics are computed via computational fluid dynamics (CFD) and validated experimentally for an unbaffled (UB) and two baffled configurations. Proper orthogonal decomposition (POD) is used to extract dominant spatial-temporal flow features affecting the underlying flow patterns. Results show very good agreement between simulations and experiments, while POD analysis revealed the existence of highly energetic and periodic modes, linked to interactions between impeller jet and reactor walls. These modes are responsible for an impeller jet instability, which is amplified by the presence and size of baffles.

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