Determination of correlations to predict the minimum agitation speed for complete solid suspension in agitated vessels

P. M. Armenante, E. U. Nagamine, J. Susanto

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Abstract

Experiments were conducted to determine the effects of impeller clearance, impeller diameter, and other operating variables on the minimum agitation speed for off-bottom solid suspension in agitated vessels, Njs, for disc turbines (DTs) and flat-blade turbines (FBTs). Only data for which the impellers produced recirculation flows above and below the impeller (the so-called 'double-eight' flow pattern) were considered. Regression equations for Njs were obtained, in which explicit terms for impeller clearance and vessel diameter-to-impeller diameter ratio (T/D ratio) were included. Modified Zwietering equations (Zwietering, 1958) were also obtained, in which Zwietering's parameter S was mathematically expressed as a function of vessel diameter-to-impeller clearance ratio and T/D ratio. When used together with the correlations of Armenante and Uehara Nagamine (1998) for impellers close to the vessel bottom, the equations presented here can be used to calculate Njs for DTs and FBTs for any typical impeller clearance.

Original languageEnglish (US)
Pages (from-to)413-419
Number of pages7
JournalCanadian Journal of Chemical Engineering
Volume76
Issue number3
DOIs
StatePublished - Jan 1 1998

All Science Journal Classification (ASJC) codes

  • Chemical Engineering(all)

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