Journal
CANADIAN JOURNAL OF CHEMICAL ENGINEERING
Volume 89, Issue 5, Pages 1040-1050Publisher
WILEY
DOI: 10.1002/cjce.20556
Keywords
high shear mixer; rotor-stator; scaling-up; emulsification; Weber number
Categories
Funding
- Engineering and Physical Sciences Research Council (ESPRC)
- Unilever
- Royal Commission
- Royal Society of the UK
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In-line rotor-stator mixers are widely applied in industry for the formulation of emulsion products; however, the current understanding of break-age/coalescence in such devices is limited. In this study the effect of rotor speed, flow rate and dispersed phase viscosity on drop size distributions in an industrial and in a lab scale in-line Silverson rotor-stator mixer were investigated. Silicone oils with viscosities of 9.4 and 339 mPa s at 1 wt.% were emulsified in surfactant solution. Sauter mean diameters were correlated with various parameters and it has been found that Weber number is the most appropriate scaling parameter. Energy dissipation rate is a marginally poorer scaling parameter and this term requires prior knowledge of the experimentally determined power constants. Based on these observations it seems sensible to use Weber number as the preferred scaling-up parameter.
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