Influence of solids on macro-instabilities in a stirred tank
Journal article, 2012
Measurements were conducted in a cylindrical tank stirred with a PBT in order to study the effect of varying amounts of suspended solids, up to 11.8% by volume, on the frequency and amplitude of macro-instabilities (MI). Solid glass particles of three different sizes were used in order to investigate the influence of the particle Stokes number. Measurements were made at 18 different locations in the vessel using laser Doppler anemometry (LDA) and were evaluated with the Lomb algorithm to obtain the frequency spectrum of the liquid flow. The results showed that the MI frequency is not influenced by the addition of solids. However, the MI amplitude was reduced by the addition of the solid phase although still detectable up to the highest concentration measured (11.8 vol.%). In the studied system there seems to be a difference dependent on the particle Stokes number.
vessel
cloud height
liquid
velocity-field
frequency
suspension
macroinstabilities
Solid-liquid
Macro-instabilities
LDA
Stirred tank
reactors
flow
prediction
Author
Matthias Eng
Chalmers, Chemical and Biological Engineering, Chemical Engineering Design
Anders Rasmuson
Chalmers, Chemical and Biological Engineering, Chemical Engineering Design
Chemical Engineering Research and Design
0263-8762 (ISSN) 1744-3563 (eISSN)
Vol. 90 8 1052-1062Subject Categories
Chemical Sciences
DOI
10.1016/j.cherd.2011.11.005