Effect of grid-screen on bubble characteristics of vertically discharged bubble plumes

Behzadipour, Arsalan; Azimi, Amir H.; Neto, Iran Eduardo Lima

doi:10.1016/j.ces.2022.117545

Cited by 6 publications

(1 citation statement)

References 64 publications

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“…Nikakhtari and Hill 13 installed a mesh packing in an airlift reactor, which improved the masstransfer coefficient by decreasing bubble size. Behzadipour et al 14 utilized a grid screen to enhance dispersion of bubble plumes. Results indicated that the bubble size was reduced by 31% after bubbles passed through the grid screen with improved entrainment and mixing.…”

Section: Introductionmentioning

confidence: 99%

Local Gas Holdup, Bubble Size Distribution, and Bubble Velocity in a Submerged Rotating Packed Bed Reactor

Yang,

Xu,

et al. 2024

Ind. Eng. Chem. Res.

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Rotating packed bed (RPB) commonly generates tremendous centrifugal force to disperse the liquid phase and promote mass-transfer processes. However, plenty of chemical processes, such as oxidation and fluorination, featuring dispersed gas and continuous liquid, exist in the chemical industry. The gas-dispersed systems possessed low gas/liquid ratios, and the liquid residence time and operating mode of conventional RPBs cannot meet such reaction needs. Herein, a submerged RPB was developed for gas-dispersed systems. The stainless-steel wire mesh packing was immersed in liquid, while gas was dispersed and cocurrently flowed with liquid through the rotating packing. Hydrodynamic characteristics of the gas dispersion performance were then investigated by optical probe measurements. Results indicated that local gas holdup (0.85−5.42%) was proportionally correlated to the gas flow rate. Bubble size conformed to the log−normal distribution with a standard deviation in ranges of 0.59−1.17. With the elevation of rotational speed and diminishment of aeration rate, Sauter mean diameter of bubbles (d 32 , 1.49−5.51 mm) was decreased, and the average velocity of bubbles (v, 0.56−1.85 m/s) was increased. In a 0.05% ethanol−water solution, bubble coalescence probability could be reduced, and the bubble size was 20.2% smaller than that in water. Correlations to predict d 32 and v were established with deviations less than ±20 and ±15%, respectively.

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Section: Introductionmentioning

confidence: 99%