Influence of the size of heat exchanging internals on the gas holdup distribution in a bubble column using gamma-ray computed tomography

3D CFD Simulation of a Bubble Column with Internals: Validation of Interfacial Forces and Internal Effects for Local Gas Holdup Predictions

“…Hence, the mass flow rate of the gas phase is less than that in the column without internals to a certain extent. This finding agrees with the results reported by Al Mesfer et al, 1 Kagumba and Al-Dahhan, 29 and Sultan et al 66 Furthermore, as shown in Figure 18, the presence of internals significantly alters the gas holdup profiles from a smooth parabolic shape for the bubble column without internals to wavy line profiles in the bubble column with internals. This phenomenon has been attributed to the occupying cross section of the bubble column by the internals.…”

Bubble size distribution in a bubble column with vertical tube internals: Experiments and CFD‐PBM simulations

“…This reduction in gap distance renders more difficulty for bubble lateral migration, and more bubbles are trapped near wall. The pronounced increase of gas holdup near wall at high percentage of internals has also been reported in the literature 30,31,40 …”

“…The pronounced increase of gas holdup near wall at high percentage of internals has also been reported in the literature. 30,31,40 In summary, the joint effects of entrance gas maldistribution and internals give rise to the asymmetrical profile of gas holdup and the reversal of the canonical core-annulus structure at low SGV. The radial symmetry recovers in all the columns at high SGV, and the gas holdup near wall evidently increases in the presence of 20% internals due to the hindrance of bubble radial migration.…”

Process intensification in multifunctional reactors: A review of multi-functionality by catalytic structures, internals, operating modes, and unit integrations

“…and Technology [23,27,[35][36][37][38] were actively involved in the hydrodynamic study of flows in bubble columns with the heat exchanging internals of various configurations (some configurations are shown in Figure 3). The designs provide heat removal to maintain isothermal and steady operations in processes like FT synthesis, where non-isothermal operations affect the desired product s selectivity and yield.…”

“…Besides eliminating the need for external heat exchangers, the cooling internals also reduces the overall back-mixing of phases, promoting ideal cascade reactor operation behaviour. stainless-steel distributor (perforated plate) [37], and (c) some examples of circular configurations (spacers/supports) [37]. Reproduced with permission from Elsevier.…”