Improving the flow of stirred vessels with anchor type impellers

Pedrosa, S.M.C.P.; Duarte, Carlos; Nunhez, José Roberto

doi:10.1016/s1570-7946(00)80069-3

Cited by 3 publications

(2 citation statements)

References 7 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Similar outcomes have been remarks in previous analyses where the thermic and hydrodynamical behaviors were investigated using 2-D numerical studies by Refs. 15,[29][30][31] and in the 3-D simulation probed by Pedrosa et al 32 and Gammoudi et al 33 .…”

Section: Resultsmentioning

confidence: 99%

Investigation of mixing viscoplastic fluid with a modified anchor impeller inside a cylindrical stirred vessel using Casson–Papanastasiou model

Benhanifia

Redouane

Rahmani

et al. 2022

Sci Rep

View full text Add to dashboard Cite

In process engineering as chemical and biotechnological industry, agitated vessels are commonly used for various applications; mechanical agitation and mixing are performed to enhance heat transfer and improve specific Physico-chemical characteristics inside a heated tank. The research subject of this work is a numerical investigation of the thermo-hydrodynamic behavior of viscoplastic fluid (Casson–Papanastasiou model) in a stirred tank, with introducing a new anchor impeller design by conducting some modifications to the standard anchor impeller shape. Four geometry cases have been presented for achieving the mixing process inside the stirred vessel, CAI; classical anchor impeller, AI1; anchor impeller with added horizontal arm blade, AI2 and AI3 anchor impeller with two and three added arm blades, respectively. The investigation is focused on the effect of inertia and plasticity on the thermo-hydrodynamic behavior (flow pattern, power consumption, and heat transfer) by varying the Reynolds number (Re = 1, 10, 100, 200), Bingham number (Bn = 1, 10, 50), in addition to the effect of geometry design in the overall stirred system parameters. The findings revealed an excellent enhancement of flow pattern and heat transfer in the stirred system relatively to the increase of inertia values. Also, an energy reduction has been remarked and the effect of anchor impeller shape. AI3 geometry design significantly improves the flow pattern and enhances heat transfer by an increased rate of 10.46% over the other cases.

show abstract

Section: Resultsmentioning

confidence: 99%

Investigation of mixing viscoplastic fluid with a modified anchor impeller inside a cylindrical stirred vessel using Casson–Papanastasiou model

Benhanifia

Redouane

Rahmani

et al. 2022

Sci Rep

View full text Add to dashboard Cite

show abstract

“…Numerous alternative mixer configurations have been proposed to enhance mixing at low to medium Re numbers, including anchored impellers, coaxial configurations that combine a radial impeller and an anchor impeller, double ribbon impeller configurations, Maxblend® impeller configurations, and other nonconventional geometries that combine impellers that rotate in the same direction or in a counter‐rotating mode . Still others explore novel impeller geometries …”

Section: Introductionmentioning

confidence: 99%

The simplest stirred tank for laminar mixing: Mixing in a vessel agitated by an off‐centered angled disc

Bulnes-Abundis

Álvarez

2013

AIChE Journal

View full text Add to dashboard Cite

We study the mixing structure, mixing performance, and short term dynamics in round bottomed laminar tanks agitated by an eccentrically located angled disc. We define eccentricity (E 5 e/R) as the ratio of the distance of the axis of rotation from the center line of the tank (e) and the tank radius (R). The structural and dynamic features observed at different eccentricity values were compared using planar laser-induced fluorescence techniques and computational fluid dynamics calculations. A Poincar e analysis demonstrates the chaotic nature of the flow induced by eccentricity. Practically globally chaotic conditions are observed for E 5 0.42 and E 5 0.50, with mixing times of 5-8 min at Re 5 416. We study the effect of different injection points on the short-term mixing dynamics and we calculate axial flow rates and Power numbers. Stirred tanks agitated by an eccentrically located angled disc are a simple and cost effective system for laminar mixing applications.The intersection of the trajectories of 10,000 particle originated at TIP3 with the vertical midplane were recorded at three different time intervals: from 2 to 5 s after injection (first row); from 20 to 30 s after injection (second row); and from 30 to 60 s after injection (third row).Conclusions derived about mixing performance based on the exclusive inspection of only one vertical plane (in this case the tank midplane) can be misleading. This cautionary 3100The dispersion of a tracer injection composed by 10,000 particles was originated from four different tracer injection positions: (a) TIP1, (b) TIP2, (c) TIP3, and (d) TIP4. The intersections of each one of the particle trajectories with the vertical midplane are recorded at three different time intervals: from 2 to 5 s after injection (first row); from 20 to 30 s after injection (second row); and from 30 to 60 s after injection (third row).For reference, curves of Power Number vs. Re for conventional concentric impeller configurations are presented: HE-3 at D/T 5 0.2 (yellow line); HE-3 at D/T 5 0.3 (green line); HE-3 at D/T 5 0.4 (blue line); HE-3 at D/T 5 0.5 (continuous red line); Rushton impeller (dotted red line).

show abstract

Numerical investigation of mixed convection in an anchor-stirred tank filled with an Al2O3-water nanofluid

et al. 2021

View full text Add to dashboard Cite

Improving the flow of stirred vessels with anchor type impellers

Cited by 3 publications

References 7 publications

Investigation of mixing viscoplastic fluid with a modified anchor impeller inside a cylindrical stirred vessel using Casson–Papanastasiou model

Investigation of mixing viscoplastic fluid with a modified anchor impeller inside a cylindrical stirred vessel using Casson–Papanastasiou model

The simplest stirred tank for laminar mixing: Mixing in a vessel agitated by an off‐centered angled disc

Numerical investigation of mixed convection in an anchor-stirred tank filled with an Al2O3-water nanofluid

Contact Info

Product

Resources

About