Computational and experimental investigation of the breakup mechanism of bubbles and drops in turbulent flows

R. (Ronnie) Andersson, Arash Helmi Siasi Farimani

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Abstract

This work focuses on understanding the breakup mechanism of bubbles and drops in turbulent multiphase flow. For this purpose CFD simulations based on a combination of large eddy simulations (LES) and volume of fluid (VOF) are validated using high speed camera measurement of the breakup dynamics. Very good agreement was found, both for deformation time and length scales and for the resulting size of the daughter fragments. The analysis reveals that eddies larger than the fluid particles also contribute to the breakup. It was also observed that the axis of the deformed particle and the vortex core axis were aligned perpendicular to each other, and that the breakup can sometimes occur due to interaction with two eddies at the same time. In these cases the vortex core axes were also aligned perpendicular. This means that more energy will be available and that the breakup rate will be affected.
Original languageEnglish
Title of host publication9th International Conference on CFD in the Minerals and Process Indus Tries CSIRO, Melbourne, Australia, 10-12 December 2012,
Number of pages6
Publication statusPublished - 2012
Event9th International Conference on Computational Fluid Dynamics (CFD) in the Minerals and Process Industries (CFD 2012), December 10-12, 2012, Melbourne, Australia - Melbourne, Australia
Duration: 10 Dec 201212 Dec 2012

Conference

Conference9th International Conference on Computational Fluid Dynamics (CFD) in the Minerals and Process Industries (CFD 2012), December 10-12, 2012, Melbourne, Australia
Abbreviated titleCFD 2012
Country/TerritoryAustralia
CityMelbourne
Period10/12/1212/12/12

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