Mitigation of scale formation in unbaffled stirred tanks-experimental assessment and quantification

Davoody, M, Graham, L, Wu, J, Witt, P, Madapusi, S and Parthasarathy, R 2019, 'Mitigation of scale formation in unbaffled stirred tanks-experimental assessment and quantification', Chemical Engineering Research and Design, vol. 146, pp. 11-21.


Document type: Journal Article
Collection: Journal Articles

Title Mitigation of scale formation in unbaffled stirred tanks-experimental assessment and quantification
Author(s) Davoody, M
Graham, L
Wu, J
Witt, P
Madapusi, S
Parthasarathy, R
Year 2019
Journal name Chemical Engineering Research and Design
Volume number 146
Start page 11
End page 21
Total pages 11
Publisher Elsevier
Abstract A qualitative and quantitative investigation on the formation of scale in mixing tanks was conducted. The fabrication of a purpose-built tank that could be disassembled into nine segments (including a base, four walls, and four baffles or four blanking pieces) allowed the measurement of scale thickness in critical regions such as the impeller zone. The scale grown on the walls of the tank was physically scanned using a coordinate measuring machine (CMM). The CMM readings were then used to plot 3-D graphs of scale thickness and distribution on the walls of the tank. Experiments conducted under unbaffled and baffled conditions showed that the bottom region of the reactor was almost free of scale while the top region near the liquid surface had noticeable scale formation under both configurations. The scale thickness and distribution were lower in the unbaffled tank compared to the baffled tank, which, in line with CFD simulations, can be attributed to the increased tangential liquid flow velocity near the tank wall under unbaffled condition.
Subject Chemical Engineering Design
Keyword(s) CFD
Coordinate measuring machine
Fluid mechanics
Mixing
Scale formation
Unbaffled tanks
DOI - identifier 10.1016/j.cherd.2019.03.032
Copyright notice © 2019 Institution of Chemical Engineers
ISSN 0263-8762
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