Vortex Structures around a Flat Paddle Impeller in a Stirred Vessel

Effect of the Rotating Reference Frame Size for Simulating a Mixing Straight-Blade Impeller in a Baffled Stirred Tank.

“…In order to test our CFD results with respect to the appropriate extent of the RRF region for a stirred tank operating at fully turbulent conditions, an additional CFD model of an experimental agitation system published by Suzukawa, Kato, et al, (2006); , was reproduced. They carried out a study of turbines with four flat blades with four different attack angles, 45°, 60°, 75°and 90°, respectively.…”

“…Information on the experimental setup can be found in the references of Suzukawa, Kato, et al, (2006); , and only relevant details in the context of this work are indicated below. The system investigated was a flat bottom cylindrical vessel equipped with four equallyspaced vertical baffles of width J = T/10, with no gap between the vessel wall and each baffle.…”

“…In Table 4 our simulation results and the experimental data reported by and Suzukawa, Kato, et al (2006) are compared. These data consist of the dimensionless tangential velocity component (v θ ) at the impeller midplane (y=0) at two radial distances x 1 /R =0.49 and x 2 /R =0.816 when the impeller blade is positioned halfway between two immediate baffles (Suzukawa, Kato, et al, 2006). Also, the N P and dimensionless values of the flow induced by the impeller [Q/(v tip R 2 )] are compared.…”

Heat transfer and ice slurry production analysis in scraped surface plate heat exchangers

“…As a matter of fact, it is a common practice in the flow study of rotating mixers and stirrers, where the resulting relative velocity is also normalized by the blade tip velocity. The flow appears then as steady, revealing the pattern that explains the mixing process inside this type of devices [111][112][113]. According to that, Fig.…”

“…The roll up vortex is the responsible of an important secondary flow in the SSPHE compared with common stirrers with vertical paddles, where the mixing blades are far enough of the bottom of the agitated tank. In such situations, as when a plate moves in a normal direction, two symmetric roll up vortices appears in each of the blade ends [112,113]. The symmetric, counter-rotating vortices, counteract any vertical flow beyond the symmetry plane.…”