Detached Eddy Simulation of Turbulent Flow in Stirred Tank Reactor

A simulation of an unbaffled stirred tank reactor driven by a magnetic stirring rod was carried out in a moving reference frame. The free surface of unbaffled stirred tank was captured by Euler–Euler model coupled with the volume of fluid (VOF) method. The re-normalization group (RNG) k–ɛ model, large eddy simulation (LES) model and detached eddy simulation (DES) model were evaluated for simulating the flow field in the stirred tank. All turbulence models can reproduce the tangential velocity in an unbaffled stirred tank with a rotational speed of 150 rpm, 250 rpm and 400 rpm, respectively. Radial velocity is underpredicted by the three models. LES model and RNG k–ɛ model predict the better tangential velocity and axial velocity, respectively. RNG k–ɛ model is recommended for the simulation of the flow in an unbaffled stirred tank with magnetic rod due to its computational effort.

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Large-eddy simulation of the turbulent free-surface flow in an unbaffled stirred tank reactor

Chemical Engineering Science ◽

10.1016/j.ces.2010.03.014 ◽

2010 ◽

Vol 65 (15) ◽

pp. 4307-4322 ◽

Cited By ~ 31

Author(s):

N. Lamarque ◽

B. Zoppé ◽

O. Lebaigue ◽

Y. Dolias ◽

M. Bertrand ◽

...

Keyword(s):

Free Surface ◽

Large Eddy Simulation ◽

Free Surface Flow ◽

Surface Flow ◽

Stirred Tank ◽

Stirred Tank Reactor ◽

Tank Reactor ◽

Eddy Simulation ◽

Large Eddy

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Detached eddy simulation on the turbulent flow in a stirred tank

AIChE Journal ◽

10.1002/aic.12807 ◽

2011 ◽

Vol 58 (10) ◽

pp. 3224-3241 ◽

Cited By ~ 33

Author(s):

J. Gimbun ◽

C. D. Rielly ◽

Z. K. Nagy ◽

J. J. Derksen

Keyword(s):

Turbulent Flow ◽

Stirred Tank ◽

Detached Eddy Simulation ◽

Eddy Simulation

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Detached Eddy Simulation of the Turbulent Flow in a Stirred Tank

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.236-238.1487 ◽

2011 ◽

Vol 236-238 ◽

pp. 1487-1491 ◽

Cited By ~ 2

Author(s):

Feng Ling Yang ◽

Shen Jie Zhou ◽

Gui Chao Wang

Keyword(s):

Kinetic Energy ◽

Turbulent Flow ◽

Computational Cost ◽

Stirred Tank ◽

Detached Eddy Simulation ◽

Mean Velocity ◽

Eddy Simulation ◽

Energy Profiles ◽

Les Model ◽

Des Model

In the present work, detached eddy simulation (DES) of the turbulent flow in an unbaffled stirred tank agitated by a six-pitched-blade turbine was carried out. The sliding mesh (SM) approach was applied to simulate the rotation of the impeller. For comparison, the computations based on the large eddy simulation (LES) model and RANS equations closed with Reynolds stress model (RSM) were also performed. The instantaneous velocity fluctuations, mean velocity and turbulent kinetic energy profiles were analyzed and compared with the laser doppler velocimetry (LDV) results from literature. Results show that DES model can capture the unsteady turbulent flow characteristics accurately. The mean velocity and turbulent kinetic energy profiles by the DES model are in good agreements with the LES results and the LDV data. Besides, the computational cost of DES is only about 80% of LES. By contrast, the results obtained by RSM are not so good. It can be concluded that the DES model can produce as similarly good predictions as LES with less computational cost, and can work as an alternative of the LES model in predicting the hydrodynamics in the stirred tanks.

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Evaluation of large Eddy simulation and Euler-Euler CFD models for solids flow dynamics in a stirred tank reactor

AIChE Journal ◽

10.1002/aic.11417 ◽

2008 ◽

Vol 54 (3) ◽

pp. 766-778 ◽

Cited By ~ 37

Author(s):

Debangshu Guha ◽

P. A. Ramachandran ◽

M. P. Dudukovic ◽

J. J. Derksen

Keyword(s):

Large Eddy Simulation ◽

Flow Dynamics ◽

Stirred Tank ◽

Stirred Tank Reactor ◽

Tank Reactor ◽

Eddy Simulation ◽

Cfd Models ◽

Large Eddy

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Free Surface Turbulent Flow in an Unbaffled Stirred Tank: Detached Eddy Simulation and VOF Study

Chemical and Biochemical Engineering Quarterly ◽

10.15255/cabeq.2014.2056 ◽

2015 ◽

Vol 29 (3) ◽

pp. 395-403 ◽

Cited By ~ 9

Author(s):

F. L. Yang

Keyword(s):

Free Surface ◽

Turbulent Flow ◽

Stirred Tank ◽

Detached Eddy Simulation ◽

Eddy Simulation

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Experimental Study and Detached Eddy Simulation of the Macro-Instability in an Eccentric Stirred Tank

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.66-68.20 ◽

2011 ◽

Vol 66-68 ◽

pp. 20-26 ◽

Cited By ~ 1

Author(s):

Feng Ling Yang ◽

Shen Jie Zhou ◽

Gui Chao Wang

Keyword(s):

Reynolds Number ◽

Turbulent Flow ◽

Simulation Method ◽

Dominant Frequency ◽

Diameter Ratio ◽

Stirred Tank ◽

Detached Eddy Simulation ◽

Rushton Turbine ◽

Eddy Simulation ◽

Tank Diameter

The turbulent flow in stirred tank is highly complicated and anisotropic, especially when the macro-instability (MI) are involved. In this work, the numerical simulation method of the eccentric agitation was established based on the detached eddy simulation (DES) model to study the MI in an eccentric stirred tank. The turbulent flow in the eccentrically located Rushton turbine stirred tank was numerically investigated. The rotation of the impeller was simulated by the transient sliding mesh (SM) method. The effect of eccentricity, impeller Reynolds number and impeller-tank diameter ratio were studied in order to quantify the MI frequency. PIV experiments were performed to validate the DES results and frequency analyses were applied to the obtained time series of the velocity recordings. It was found that the flow field in eccentrically stirred tank are highly unsteady and is subject to MI with varying period less than 10 blade passage period. Good agreements have been found between the DES and PIV results, both indicate that the dominant frequency of MI increases linearly with the Reynolds number, increases with the impeller-tank diameter ratio and decreases with the eccentricity. According to the agreements between the experimental and simulation results, it can be concluded that the combination of DES and SM is suitable for the prediction of the MI phenomenon in stirred tanks.

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