The minimum transport velocity of colloidal silica suspensions

Harbottle, David, Fairweather, Michael and Biggs, Simon (2011) The minimum transport velocity of colloidal silica suspensions. Chemical Engineering Science, 66 11: 2309-2316. doi:10.1016/j.ces.2011.02.012


Author Harbottle, David
Fairweather, Michael
Biggs, Simon
Title The minimum transport velocity of colloidal silica suspensions
Journal name Chemical Engineering Science   Check publisher's open access policy
ISSN 0009-2509
1873-4405
Publication date 2011-06-01
Sub-type Article (original research)
DOI 10.1016/j.ces.2011.02.012
Volume 66
Issue 11
Start page 2309
End page 2316
Total pages 8
Place of publication Kidlington, Oxford, United Kingdom
Publisher Pergamon
Language eng
Abstract A 26mm N.B. horizontal pipe loop has been used to study the transport velocity of aqueous dispersions of colloidal silica. At low electrolyte concentrations the silica spheres form a stable dispersion, while at high electrolyte concentration particle aggregates are readily formed. Two measurement techniques have been used to study the critical transport velocity; (i) flow visualisation, and (ii) ultrasonic Doppler velocity profiling. Both measurement techniques show agreement in identifying the critical transport velocity. The study has shown that the critical transport velocity can be reduced when the suspension is transformed from a dispersed (d50=0.8γm) to an aggregated (d50=4.6γm) state. Such behaviour is related to the introduction of inter-floc flow through aggregates, enhancing the turbulence intensity of the fluid.
Keyword Agglomeration
Colloidal phenomena
Critical transport velocity
Multiphase flow
Turbulence
Turbulence intensity
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status Non-UQ

Document type: Journal Article
Sub-type: Article (original research)
Collection: Faculty of Engineering, Architecture and Information Technology Publications
 
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