Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
7006854 | Chemical Engineering Research and Design | 2016 | 33 Pages |
Abstract
The effects of liquid properties on gas hold-up, bubble formation and mass transfer in a co-current downflow contacting column (CDCC) were investigated using tap water and different types surfactant solutions. The experiments were conducted using various orifice diameters (2,3 and 4Â mm) and at different superficial gas velocities (0.07â0.188Â msâ1) and liquid re-circulation rates (3.3â6.67Â ÃÂ 10â5Â m3Â sâ1). Gas hold-up and volumetric mass transfer coefficient increased with increasing superficial gas velocity and liquid flow rate. As the surface tension decreased so did the size of the bubbles formed such that low kLa values and higher gas hold-up values were obtained. Empirical correlations were proposed for evaluating gas hold-up and volumetric mass transfer coefficients as a function of liquid kinetic power per liquid volume in the column, superficial gas velocity and relative surface tension using the experimental data obtained for the different types of surfactant solutions. These proposed correlations fit the experimental data of gas hold-up and mass transfer coefficients reasonably well for all gas and liquid flow rates and at orifice diameter used.
Keywords
Related Topics
Physical Sciences and Engineering
Chemical Engineering
Filtration and Separation
Authors
Ramazan Orhan, Gülbeyi Dursun,