Population balance modelling of bubble columns under the heterogeneous flow regime

Effect of viscosity on homogeneous–heterogeneous flow regime transition in bubble columns

Experiments were performed in a cylindrical 0.14 m diameter bubble column with a metal perforated plate. Air and aqueous solutions of glycerol with viscosity 1–22 mPa s were the phases. Gas holdup was measured and plotted against the gas flow rate. The critical point where the homogeneous–heterogeneous regime transition begins was determined by the drift-flux plot of the primary data. The homog...

Liquid phase dispersion in bubble columns operating in the churn-turbulent flow regime

The objective of this paper is to develop a reliable, yet-simple, correlation for the liquid phase axial dispersion coefficient Dax,L in bubble column reactors. In order to develop this correlation we carried out measurements of the centre-line liquid velocity VL(0) and Dax,L in bubble columns of diameter DT=0.174, 0.38 and 0.63 m with the air-water system. The measurements were performed in th...

Three-dimensional mathematical modeling of dispersed two-phase flow using class method of population balance in bubble columns

Determination of Bubble Size Distributions in Bubble Columns Using LDA

A new method is developed for the determination of bubble size distributions from experimental laser Doppler anemometry (LDA) data through simultaneous measurement of only two orthogonal velocity components and the intermittent time gaps arising out of bubbles passing through the measurement point. An experimentally verifiable assumption of axisymmetry allowed the calculation of the three-dimen...

Hydrodynamics of Ionic Liquids in Bubble Columns