Hydrodynamic effects of air sparging on hollow fiber membrane filtration in a bubble column reactor

Effect of turbulence on hollow fiber membrane filtration in multiphase reactors

“…It can be seen that the mean pressure increased as the air flow rate rose for both solutions. Xia (2013) explained that the air flow rate correlates with the liquid level, therefore as the air flow rate increases, the water level also rises corresponding to the increase of static pressure.…”

“…In this study, the pressure sensing measurement technique which was attempted in Xia (2013) for clean water with air bubbling is further developed in this study with additional mixed liquor, as it can potentially serve as an attractive alternative to be applied widely in the industry to pursue system optimization and energy minimization, due to its easy implementation, low operating cost as well as robustness. The analysis of pressure fluctuation signals (PFS) is a promising approach to identify the hydrodynamics of the multiphase reactors.…”

“…So far, PFSs have been used to quantify the flow characteristics in bubble column reactors mainly in the high air flow regimes (Al-Masry et al 2007). To the knowledge of the author, the use of low air flow rates was only limited to a few studies including Lin et al (2001) and Xia (2013). In addition, the previous studies mainly focused on the static pressure fluctuations, and did not include the dynamic pressure.…”

“…As can be seen in Figures 8.13 and 8.14, λ was always positive in the present experiments, therefore the system is chaotic. Xia (2013) hypothesized that LLE reaching a plateau implies the establishment of the turbulence saturation conditions in the system. The hypothesis is yet to be fully verified.…”