Hydrodynamics Of Two Phase Flow For Coalescing And Non Coalescing Systems


This experimental study is aimed at investigating the effect of superficial gasvelocity, liquid phase properties and gas distribution on gas holdup, bubblecharacteristics and drag coefficient in two-phase bubble column. Various liquidscovering a sufficiently broad range of viscosity and surface tension values wereemployed, while the gas phase was atmospheric air. Aqueous glycerine solutions wereused to simulate the behavior of coalescing viscous liquids whereas aqueous alcoholsolutions were used to simulate the behavior of non-coalescing organic liquids. Theexperimental results obtained with two different types of gas distributor in thecoalescence solutions and in non coalescence solutions were compared with data onstandard air–water system. A computerized conductivity probe system and high speeddigital camera were used for the systematic measurements of bubble size, velocity andgas hold-up. Correlations based on dimensionless groups were proposed for theprediction of gas holdup and drag coefficient in the homogeneous flow regime.