Abstract
The flow and drag phenomena of contaminated spherical bubbles in columns filled with surfactant-laden Carreau model fluids is numerically investigated using a computational fluid dynamics based commercial solver, COMSOL Multiphysics 4.3b. The effect of contaminants is incorporated in the solver by the use of the spherical stagnant cap model. The numerical solver is thoroughly benchmarked through extensive validation with the existing literature results. Further new simulations are performed over wide range of the conditions as the Reynolds number (Re) varying in the range of (0-100), the power law index (n) ranging between (0.2-0.8), the Carreau number (Λ) varying in the range of (1-100) and the degree of contamination (α) ranging between (0-180°). Briefly, the results indicate that recirculation wakes behind the bubbles are observed for all values of Carreau number ranging between 1-100 if the bubble is at least partially contaminated, i.e., for α > 30°. The total drag coefficient decreases with the increasing Carreau and/or Reynolds numbers and/or with the decreasing power-law index and/or with the decreasing cap angle.
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callMore From: Progress in Computational Fluid Dynamics, An International Journal
Disclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
