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CHARACTERIZING IMPELLER PERFORMANCE IN STIRRED …

Richard K. Grenville Director of Mixing Technology Mix Thoroughly Until Smooth IChemE South Wales Branch 25th April 2017 CHARACTERIZING IMPELLER PERFORMANCE IN STIRRED TANKS WITH EXAMPLES OF PROCESS RESULTS TOPICS Some words on IMPELLER geometries: Blade shapes etc. Re-cap on pump sizing. Applying pump rules to impellers in STIRRED tanks: Defining efficiency. Shear characteristics: Time-averaged velocity gradient. Dispersion of immiscible liquids. Trailing vortex: Look again at dispersion data. Conclusions. 2 IMPORTANCE OF MIXING Smith (Trans IChemE., 1990): US chemical industry loses $ 10 109 each year due to poor mixing: 1 % increase in yield ~ $ 1 106.

• Impellers in stirred tanks are pumps: – Power input and flow generated can be measured. • Impeller characteristics are rigorously quantified: – Hydraulic and Flow Efficiencies. – Maximum Energy Dissipation Rate in Trailing Vortex. • Characterization confirmed by Equilibrium Droplet and Floc Sizes generated with different impellers.

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