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Influence of impeller type on the flow and mixing in a stirred reactor

Revstedt, Johan LU ; Fuchs, Laszlo LU ; Kovács, Tamás LU and Trägårdh, Christian LU (2000) In AIChE Journal 46(12). p.2373-2382
Abstract
Large eddy simulations (LES) of a stirred reactor with a liquid volume of 0.64 m3 were performed. The tank was stirred by either two standard Rushton impellers or two Scaba 6SRGT impellers. The LES can provide details of the flow field that cannot be obtained with so‐called Reynolds‐averaged equations and the corresponding models. The unsteady spatially filtered incompressible Navier‐Stokes equations were solved together with a transport equation for the concentration of an inert additive using a multigrid finite difference code with a staggered grid. The unresolved turbulent scales were modeled using a scale similarity model. The aim of this investigation has been to study the influence of impeller type on the flow structure and scalar... (More)
Large eddy simulations (LES) of a stirred reactor with a liquid volume of 0.64 m3 were performed. The tank was stirred by either two standard Rushton impellers or two Scaba 6SRGT impellers. The LES can provide details of the flow field that cannot be obtained with so‐called Reynolds‐averaged equations and the corresponding models. The unsteady spatially filtered incompressible Navier‐Stokes equations were solved together with a transport equation for the concentration of an inert additive using a multigrid finite difference code with a staggered grid. The unresolved turbulent scales were modeled using a scale similarity model. The aim of this investigation has been to study the influence of impeller type on the flow structure and scalar transport. The results show that, compared at equal power input, the center plane velocities and the volume flow in the impeller stream do not differ much for the impeller types. Also, for the 6SRGT the periodic fluctuations associated with the blade passing is less pronounced (Less)
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published
subject
in
AIChE Journal
volume
46
issue
12
pages
5 pages
publisher
John Wiley and Sons
ISSN
1547-5905
DOI
10.1002/aic.690461206
language
English
LU publication?
yes
id
2c9f7c1b-58a1-4097-8ab1-5f1b79989657
date added to LUP
2019-04-30 19:29:35
date last changed
2020-12-26 04:52:25
@article{2c9f7c1b-58a1-4097-8ab1-5f1b79989657,
  abstract     = {Large eddy simulations (LES) of a stirred reactor with a liquid volume of 0.64 m3 were performed. The tank was stirred by either two standard Rushton impellers or two Scaba 6SRGT impellers. The LES can provide details of the flow field that cannot be obtained with so‐called Reynolds‐averaged equations and the corresponding models. The unsteady spatially filtered incompressible Navier‐Stokes equations were solved together with a transport equation for the concentration of an inert additive using a multigrid finite difference code with a staggered grid. The unresolved turbulent scales were modeled using a scale similarity model. The aim of this investigation has been to study the influence of impeller type on the flow structure and scalar transport. The results show that, compared at equal power input, the center plane velocities and the volume flow in the impeller stream do not differ much for the impeller types. Also, for the 6SRGT the periodic fluctuations associated with the blade passing is less pronounced},
  author       = {Revstedt, Johan and Fuchs, Laszlo and Kovács, Tamás and Trägårdh, Christian},
  issn         = {1547-5905},
  language     = {eng},
  number       = {12},
  pages        = {2373--2382},
  publisher    = {John Wiley and Sons},
  series       = {AIChE Journal},
  title        = {Influence of impeller type on the flow and mixing in a stirred reactor},
  url          = {http://dx.doi.org/10.1002/aic.690461206},
  doi          = {10.1002/aic.690461206},
  volume       = {46},
  year         = {2000},
}