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Liquid holdup and mass transfer area are critical parameters for packedcolumn design and CO2 capture efficiency prediction. In this paper, a frameworkwas established for modeling the liquid-gas countercurrent flow hydrodynamicsin a random packed column with pall rings. Besides the column-averagedinformation, the radial pall ring distribution, velocity, and liquid holdupprofiles are obtained to study the entrance effect and the wall influence inthe packed column. With local CFD data, the validated packing specific area apand liquid velocity uL range for liquid holdup correlation is significantlyexpanded with respect to existing experimental or column-averaged CFD data. Theproposed liquid holdup correlation $h_L \propto u_L^{0.44}$ indicates therandom packed column falls in a viscous to turbulent transition regime and itcovers a Reynolds Number range of [6.7-40.2]. The derived liquid holdupcorrelation is in good agreement with existing correlations developed using thecolumn-averaged experimental data.

Investigation of countercurrent flow profile and liquid holdup in random packed column with local CFD data