Scale formation on the wall of a mechanically stirred vessel-experimental assessment and interpretation using computational fluid dynamicsr

Davoody, M, Lane, G, Graham, L, Wu, J, Madapusi, S and Parthasarathy, R 2018, 'Scale formation on the wall of a mechanically stirred vessel-experimental assessment and interpretation using computational fluid dynamicsr', AIChE Journal, vol. 64, no. 11, pp. 3912-3922.


Document type: Journal Article
Collection: Journal Articles

Title Scale formation on the wall of a mechanically stirred vessel-experimental assessment and interpretation using computational fluid dynamicsr
Author(s) Davoody, M
Lane, G
Graham, L
Wu, J
Madapusi, S
Parthasarathy, R
Year 2018
Journal name AIChE Journal
Volume number 64
Issue number 11
Start page 3912
End page 3922
Total pages 11
Publisher John Wiley & Sons, Inc.
Abstract Accelerated growth of scale was studied in a baffled agitated reactor, which could be disassembled into nine sections, allowing quantitative determination of scale thickness. A coordinate measuring machine was used to determine the scale thickness on individual wall segments. The growth pattern of the scale was found to be nonuniform due to the variation of fluid velocity near the wall at various heights. Computational fluid dynamics (CFD) simulation showed that fluid flow is time-dependent and has two distinct flow zones, one involving recirculation through the impeller in the lower part of the vessel and the other involving lower velocities due to the flow separation at the wall in the upper part. CFD simulation also showed the presence of macroinstabilities, which manifest as asymmetrical and chaotic flow structures with relatively long-time scales. Scale growth is found to be prominent in regions where the fluid velocity and wall shear stresses are low.
Subject Chemical Engineering Design
Keyword(s) scale formation
coordinate measuring machine
mixing
fluids mechanics
macroinstabilities
computational fluid dynamics
DOI - identifier 10.1002/aic.16358
Copyright notice © 2018 American Institute of Chemical Engineers
ISSN 1547-5905
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