Influence of solids on macro-instabilities in a stirred tank
Artikel i vetenskaplig tidskrift, 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

Författare

Matthias Eng

Chalmers, Kemi- och bioteknik, Kemisk apparatteknik

Anders Rasmuson

Chalmers, Kemi- och bioteknik, Kemisk apparatteknik

Chemical Engineering Research and Design

0263-8762 (ISSN) 1744-3563 (eISSN)

Vol. 90 1052-1062

Ämneskategorier

Kemi

DOI

10.1016/j.cherd.2011.11.005