Abstract
| Original language | English |
|---|---|
| Pages (from-to) | 553-562 |
| Number of pages | 10 |
| Journal | Journal of Chemical Technology and Biotechnology |
| Volume | 88 |
| Issue number | 4 |
| DOIs | |
| Publication status | Published - 2013 |
| MoE publication type | A1 Journal article-refereed |
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Keywords
- Axial dispersion coefficient
- axial to radial velocity ratio
- computational fluid dynamics
- moving baffles
- moving fluids
- oscillatory baffled reactor
- polyaniline
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Evaluation of axial dispersion and mixing performance in oscillatory baffled reactors using CFD. / Manninen, Mikko; Gorshkova, Elena; Immonen, Kirsi; Ni, X.-W. (Corresponding Author).
In: Journal of Chemical Technology and Biotechnology, Vol. 88, No. 4, 2013, p. 553-562.Research output: Contribution to journal › Article › Scientific › peer-review
TY - JOUR
T1 - Evaluation of axial dispersion and mixing performance in oscillatory baffled reactors using CFD
AU - Manninen, Mikko
AU - Gorshkova, Elena
AU - Immonen, Kirsi
AU - Ni, X.-W.
N1 - Project code: 31359
PY - 2013
Y1 - 2013
N2 - Background: The paper reports extensive CFD work and analyses of an oscillatory baffled reactor (OBR) planned to be used for the production of polyaniline continuously. In the polyaniline process, viscosity changes during the course of the reaction. Two non‐Newtonian fluids were used to represent the stages of fluids during the reaction in a simulation, in addition to water as the reference fluid. Two quantitative measures derived from the CFD results are employed to evaluate OBR reactor performance: the axial dispersion coefficient and the ratio of axial and transverse velocities. Results: The CFD data showed that the dispersion coefficient as a function of viscosity exhibits a maximum for given oscillation parameters. In the turbulent regime, the axial dispersion is often correlated with the oscillatory Reynolds number in OBR or equivalent Reynolds numbers in other reactor devices. In the high viscosity regime, such a general correlation is not valid for different operational parameters. The results of the CFD simulations in the moving baffle‐OBR indicate, for the first time, that the axial dispersion coefficients in the moving baffle arrangement is 10–17% higher than that in the moving fluid type, due to enhanced shear rate in the former device. This quantitative information is valuable for the design and smooth transition from batch to continuous reactors. Conclusion: The established dependence of axial dispersion and the ratio of axial to transverse velocities on both viscosity and the operational parameters enhanced the understanding of mixing and dispersion characteristics of the OBR. The CFD analysis supplied the information needed to determine the design parameters for the reactor used in continuous production of polyaniline.
AB - Background: The paper reports extensive CFD work and analyses of an oscillatory baffled reactor (OBR) planned to be used for the production of polyaniline continuously. In the polyaniline process, viscosity changes during the course of the reaction. Two non‐Newtonian fluids were used to represent the stages of fluids during the reaction in a simulation, in addition to water as the reference fluid. Two quantitative measures derived from the CFD results are employed to evaluate OBR reactor performance: the axial dispersion coefficient and the ratio of axial and transverse velocities. Results: The CFD data showed that the dispersion coefficient as a function of viscosity exhibits a maximum for given oscillation parameters. In the turbulent regime, the axial dispersion is often correlated with the oscillatory Reynolds number in OBR or equivalent Reynolds numbers in other reactor devices. In the high viscosity regime, such a general correlation is not valid for different operational parameters. The results of the CFD simulations in the moving baffle‐OBR indicate, for the first time, that the axial dispersion coefficients in the moving baffle arrangement is 10–17% higher than that in the moving fluid type, due to enhanced shear rate in the former device. This quantitative information is valuable for the design and smooth transition from batch to continuous reactors. Conclusion: The established dependence of axial dispersion and the ratio of axial to transverse velocities on both viscosity and the operational parameters enhanced the understanding of mixing and dispersion characteristics of the OBR. The CFD analysis supplied the information needed to determine the design parameters for the reactor used in continuous production of polyaniline.
KW - Axial dispersion coefficient
KW - axial to radial velocity ratio
KW - computational fluid dynamics
KW - moving baffles
KW - moving fluids
KW - oscillatory baffled reactor
KW - polyaniline
U2 - 10.1002/jctb.3979
DO - 10.1002/jctb.3979
M3 - Article
VL - 88
SP - 553
EP - 562
JO - Journal of Chemical Technology and Biotechnology
JF - Journal of Chemical Technology and Biotechnology
SN - 0268-2575
IS - 4
ER -