Optimum solids concentration for solids suspension and solid-liquid mass transfer in agitated vessels

Bong, E, Eshtiaghi, N, Wu, J and Parthasarathy, R 2015, 'Optimum solids concentration for solids suspension and solid-liquid mass transfer in agitated vessels', Chemical Engineering Research and Design, vol. 100, pp. 148-156.


Document type: Journal Article
Collection: Journal Articles

Title Optimum solids concentration for solids suspension and solid-liquid mass transfer in agitated vessels
Author(s) Bong, E
Eshtiaghi, N
Wu, J
Parthasarathy, R
Year 2015
Journal name Chemical Engineering Research and Design
Volume number 100
Start page 148
End page 156
Total pages 9
Publisher Elsevier Ltd.
Abstract The effect of solids concentration on specific impeller power consumption and solid-liquid mass transfer coefficient was investigated in a 0.2 m diameter baffled agitated vessel with standard six-bladed Rushton turbine for solids concentration up to 0.40 (v/v). It was found that the increase of solids concentration significantly increases the mass transfer coefficient up to an optimum solids concentration and decreases thereafter when the system is operated at a just-suspended condition. The increase in mass transfer coefficient with an increase of solid concentrations is mainly due to the increase in N-js (critical impeller speed) with increasing solids concentration, thereby leading to an upsurge of turbulence around the particles. The solids concentration at which the highest mass transfer coefficient is obtained is designated as the effective solids concentration. In a geometrically similar 0.3 m diameter tank, the trends in impeller energy efficiency and solid-liquid mass transfer coefficient values with increasing solids concentration are similar. The experimental data are satisfactorily correlated using the concept of the Kolmogoroffs theory of isotropic turbulence to develop an equation to estimate the solid-liquid mass transfer coefficient in agitated vessels.
Subject Carbon Capture Engineering (excl. Sequestration)
Chemical Engineering not elsewhere classified
DOI - identifier 10.1016/j.cherd.2015.05.021
Copyright notice © 2015 The Institution of Chemical Engineers
ISSN 0263-8762
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