Eventos Anais de eventos
ENCIT 2018
Brazilian Congress of Thermal Sciences and Engineering
EXPERIMENTAL HYDRODYNAMICS OF INTERACTING GAS BUBBLES AND OIL DROPLETS: ATTACHMENT PHENOMENA
Submission Author:
Joel Karp , PR
Co-Authors:
Joel Karp, Fabio Ernesto Mancilla Ramos, PAULO HENRIQUE DIAS DOS SANTOS, Rigoberto Morales
Presenter: Joel Karp
doi://10.26678/ABCM.ENCIT2018.CIT18-0454
Abstract
The attachment phenomena of gas bubbles to oil droplets was successfully evaluated in the present work, aiming the elucidation of the interactions found in several industrial applications. Pure nitrogen and colored corn oil acted as the dispersed phases, whereas distilled water was employed as the medium. The hydrodynamics of single bubbles in free gravitational motion was evaluated by experimental high speed recordings of the flow, allowing the estimation of the mean bubble diameter, aspect ratio and terminal velocity, in addition to the calculation of the governing dimensionless parameters Reynolds and Eӧtvӧs numbers. The experimental set-up in the Multiphase Flow Research Center (NUEM-UTFPR) allowed the controlled generation of monodispersed single gas bubbles and oil droplets. The attachment phenomena observed for individual bubble and droplet with diameters of, respectively, 3.11 and 5.8 mm consisted in the penetration of the bubble into the droplet, yielding an oil encapsulated bubble whose geometry was similar to the one of the isolated droplet, whereas the terminal velocity of the aggregate formed increased by a factor of 95%, when compared to the original droplet. The injection of gas bubbles could, therefore, enhance the separation efficiency of oily wastewater.
Keywords
soft-particle, attachment, flotation, terminal velocity
