In this work, digital image analysis coupled with a suitable shadowgraphy-based technique is employed to investigate the shape of the free-surface vortex that forms in uncovered unbaffled tanks stirred by either a D=T/3 Lightnin A310 or a D=T/3 Rushton turbine. The technique is based on back-lighting the vessel and suitably averaging vortex images over time. Data obtained show that the two different impellers give rise to quite different vortex shapes. A novel 2-parameter model is proposed that successfully describes vortex shapes obtained with both impellers.
Busciglio, A., Grisafi, F., Scargiali, F., Brucato, A. (2012). On vortex shape in unbaffled stirred vessels as measured by digital image analysis. In Proceedings ofn 14th European Conference on Mixing (pp.49-54).
On vortex shape in unbaffled stirred vessels as measured by digital image analysis
GRISAFI, Franco;SCARGIALI, Francesca;BRUCATO, Alberto
2012-01-01
Abstract
In this work, digital image analysis coupled with a suitable shadowgraphy-based technique is employed to investigate the shape of the free-surface vortex that forms in uncovered unbaffled tanks stirred by either a D=T/3 Lightnin A310 or a D=T/3 Rushton turbine. The technique is based on back-lighting the vessel and suitably averaging vortex images over time. Data obtained show that the two different impellers give rise to quite different vortex shapes. A novel 2-parameter model is proposed that successfully describes vortex shapes obtained with both impellers.
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