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In this paper, counter-current gas—liquid two-phase flow and onset of flooding in vertical narrow rectangular channels were studied. The onset of flooding in vertical narrow rectangular channels was investigated by the condition at which the liquid on the channel wall begins to move partially above the liquid injection section. In order to study the flow pattern, during counter-current flow and determine conditions associated with the onset of flooding, the flow pattern and pressure drop were investigated by visual experiments. In addition, the flooding phenomena in vertical narrow rectangular channels were compared with that in conventional channels. The results show that the flow characteristics and the tendency of pressure drop in vertical narrow rectangular channels were similarly with the conventional channels. However, the maximum of pressure drop appeared at the completed carrying up of flooding in vertical narrow rectangular channels, and it appeared at the onset of flooding in conventional channels. [ABSTRACT FROM AUTHOR]

The particle distribution on the ceramic filter surface has great effect on filtration performance. The numerical simulation method is used to analyze the particle distribution near the filter surface under different operation conditions. The gas/solid two-phase flow field in the ceramic filter vessel was simulated using the Eulerian two-fluid model provided by FLUENT code. The user-defined function was loaded with the FLUTNT solver to define the interaction between the particle and the gas near the porous ceramic candle filter. The distribution of the filter cake along the filter length and around the filter circumference was analyzed. The simulation results agree well with experimental data. The simulation model can be used to predict the particle distribution and provide theory direction for the engineering application of porous ceramic filters. [ABSTRACT FROM AUTHOR]