Euler-Euler CFD Studies on Bulk Nanobubbles in a Rectangular Bubble Column
Penulis/Author
Ir. Ryan Anugrah Putra, S.T., M.Sc., M.Eng. (1); Prof. Dr. Eng. Ir. Deendarlianto, S.T., M.Eng. (2)
Tanggal/Date
2021
Kata Kunci/Keyword
Abstrak/Abstract
The characteristics of bulk nanobubbles both in static and dynamic conditions were numerically investigated by using computational fluid dynamics (CFD) in this study. Euler-Euler approach assuming monodispersed gas phase was selected for transient simulations. Three different bubble sizes db = 500 µm, db = 500 nm and db = 100 nm were used in this work to investigate the influence of the bubble sizes on their characteristics. The CFD result in static condition showed that bubbles db = 500 µm which uniformly dispersed in the rectangular bubble column (RBC) at t = 0 s rose with significantly higher velocity in comparison to db = 500 nm dan db = 100 nm. This result indicating the higher stability of nanobubbles (i.e., db = 500 nm and db = 100 nm) in comparison to macrobubbles (i.e., db = 500 µm). The significant difference between nanobubbles and macrobubbles was also observed from the CFD simulation in dynamic condition. The jet of nanobubbles formed after the gas injection through the inlet dispersed faster than macrobubbles. The gas volume fraction distribution for all tested bubble sizes in this study showed strong relation with the vorticity distribution.
