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Numerical Investigation and Estimating Correlation of Micromixing Performance of Coaxial Mixers

Liu, Baoqing LU ; Sun, Ning ; Jin, Zhijiang ; Zhang, Yikun and Sunden, Bengt LU (2019) In Industrial and Engineering Chemistry Research 58(49). p.22376-22388
Abstract

In view of the significance, complexity, and difficulty of micromixing in viscous system, coaxial mixers with wide adaptability to viscosity are first combined with micromixing. The effects of feeding position, rotation mode, and impeller type on the micromixing performance of coaxial mixers are investigated numerically with the standard engulfment model and eddy dissipation concept model, and a dimensionless estimating correlation of segregation index Xs is established based on the Buckingham πtheorem. The results show that feeding near the discharge zone of the impeller favors the micromixing and Rushton turbine impeller (RT) is better qualified as the impeller near feeding point compared to six-straight-blade turbine... (More)

In view of the significance, complexity, and difficulty of micromixing in viscous system, coaxial mixers with wide adaptability to viscosity are first combined with micromixing. The effects of feeding position, rotation mode, and impeller type on the micromixing performance of coaxial mixers are investigated numerically with the standard engulfment model and eddy dissipation concept model, and a dimensionless estimating correlation of segregation index Xs is established based on the Buckingham πtheorem. The results show that feeding near the discharge zone of the impeller favors the micromixing and Rushton turbine impeller (RT) is better qualified as the impeller near feeding point compared to six-straight-blade turbine impeller (SBT) and six-pitched (45°)-blade turbine impeller (PBT). At the same specific power consumption, the coaxial mixer has better micromixing performance with PBT + RT as inner impeller than with SBT + RT, and the difference of segregation index resulting from the rotation mode is small. Moreover, the proposed correlation is validated to be suitable for qualitative evaluation of micromixing performance of coaxial mixer consisting of inner impeller combining PBT and RT and outer anchor.

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author
; ; ; and
organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Industrial and Engineering Chemistry Research
volume
58
issue
49
pages
13 pages
publisher
The American Chemical Society (ACS)
external identifiers
  • scopus:85075798004
ISSN
0888-5885
DOI
10.1021/acs.iecr.9b04406
language
English
LU publication?
yes
id
da345e5e-9e6f-4d85-9e83-bdb85dcb5424
date added to LUP
2019-12-16 14:54:24
date last changed
2022-04-18 19:33:29
@article{da345e5e-9e6f-4d85-9e83-bdb85dcb5424,
  abstract     = {{<p>In view of the significance, complexity, and difficulty of micromixing in viscous system, coaxial mixers with wide adaptability to viscosity are first combined with micromixing. The effects of feeding position, rotation mode, and impeller type on the micromixing performance of coaxial mixers are investigated numerically with the standard engulfment model and eddy dissipation concept model, and a dimensionless estimating correlation of segregation index X<sub>s</sub> is established based on the Buckingham πtheorem. The results show that feeding near the discharge zone of the impeller favors the micromixing and Rushton turbine impeller (RT) is better qualified as the impeller near feeding point compared to six-straight-blade turbine impeller (SBT) and six-pitched (45°)-blade turbine impeller (PBT). At the same specific power consumption, the coaxial mixer has better micromixing performance with PBT + RT as inner impeller than with SBT + RT, and the difference of segregation index resulting from the rotation mode is small. Moreover, the proposed correlation is validated to be suitable for qualitative evaluation of micromixing performance of coaxial mixer consisting of inner impeller combining PBT and RT and outer anchor.</p>}},
  author       = {{Liu, Baoqing and Sun, Ning and Jin, Zhijiang and Zhang, Yikun and Sunden, Bengt}},
  issn         = {{0888-5885}},
  language     = {{eng}},
  month        = {{12}},
  number       = {{49}},
  pages        = {{22376--22388}},
  publisher    = {{The American Chemical Society (ACS)}},
  series       = {{Industrial and Engineering Chemistry Research}},
  title        = {{Numerical Investigation and Estimating Correlation of Micromixing Performance of Coaxial Mixers}},
  url          = {{http://dx.doi.org/10.1021/acs.iecr.9b04406}},
  doi          = {{10.1021/acs.iecr.9b04406}},
  volume       = {{58}},
  year         = {{2019}},
}