The minimum transport velocity of colloidal silica suspensions

David Harbottle, Michael Fairweather, Simon Biggs

Research output: Contribution to journalArticle

14 Citations (Scopus)

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.

Original languageEnglish
Pages (from-to)2309-2316
Number of pages8
JournalChemical Engineering Science
Volume66
Issue number11
DOIs
Publication statusPublished - 1 Jun 2011
Externally publishedYes

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