Numerical simulation of flow and mass transfer characteristics in porous plate bubbling column reactor
A numerical simulation investigation was performed on the gas-liquid two-phase flow and gas-liquid mass transfer characteristics within a bubbling column reactor with various numbers of horizontally placed porous plates using the Euler-Euler dual-fluid model.Furthermore,the research investigated the impact of horizontal porous plates situated at different positions and various superficial gas velocities on gas holdup,bubble diameter,and gas-liquid mass transfer coefficient in the bubbling column reactor.The results indicate that the distribution of gas holdup was affected by the quantity and location of the porous plates.As the number of porous plates increased,the gas holdup in the upper part of the liquid phase of the bubbling column reactor increased;after installing the porous plate,the average gas holdup at the inner diameter of the reactor changed significantly,resulting in an M-shaped distribution;at various superficial gas velocities,the proportion of small bubbles with a diameter of 1-2 mm accounted for over 30%in the bubbling column reactor without the installation of a porous plate.Conversely,the proportion of small bubbles increased significantly after the installation of a porous plate.The gas-liquid mass transfer coefficient is relatively gentle in the central area(radial dimensionless between-0.5 and 0.5),with little fluctuation.Finally,the volume mass transfer coefficient obtained from the simulation calculation was compared with the calculated value of Akita's correlation equation.The calculation result was slightly higher.
bubbling column reactorCFD-PBM modelbubble diametergas holdupgas-liquid volumetric mass transfer coefficient
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