Presentation
Investigations on Breaking Dynamics of Oil Mineral Aggregates in Free Vortex Flow
SessionMeet the Poster Authors
DescriptionIn the event of an oil spill, the transformation of floating slicks into oil droplets is instigated by the turbulent actions of coastal waves. The ensuing interaction of these oil droplets with suspended minerals in the water column culminates in the formation of oil mineral aggregates (OMAs). The mechanism behind OMA formation encompasses the flocculation of oil droplets and suspended clay minerals (Bentonite and Kaolinite), with the collision kinetics dictated by the rate of particle collision, influencing equilibrium size and the time required to attain it. The turbulent energy of the fluid and the adhesive efficacy between oil droplets and suspended minerals, such as clay, govern the collision dynamics. Upon reaching the equilibrium size of OMAs, an increase in turbulent energy triggers the onset of OMA aggregate breakdown due to the turbulent shear of the fluid regime. This leads to a secondary equilibrium size smaller than the initially formed OMA. The persistence or disruption of OMAs hinges on the balance between adhesive forces and the breaking forces induced by turbulent shear. Experimental investigations, conducted in a magnetic stirrer with bead stirring generating a free vortex flow, elucidate the breaking mechanism. Employing low turbulence initially forms large OMAs, subjected to high-speed mixing to assess their breaking. Residual oil concentrations at varied mixing speeds are quantified using a fluorescence spectrometer, facilitating the calculation of resultant changes in oil concentration. These analyses are imperative for comprehending the dynamics of OMA breakage and the potential release of trapped oil into the water column.
Event Type
Poster
TimeMonday, May 13th5:00pm - 6:00pm CDT
LocationExhibit Hall G
Preparedness
Prevention
Remediation
Response
Restoration