Hydrodynamics of two phase flow for coalescing and non coalescing systems

Abstract EN

This experimental study is aimed at investigating the effect of superficial gas velocity, liquid phase properties and gas distribution on gas holdup, bubble characteristics and drag coefficient in two-phase bubble column.

Various liquids covering a sufficiently broad range of viscosity and surface tension values were employed, while the gas phase was atmospheric air.

Aqueous glycerine solutions were used to simulate the behavior of coalescing viscous liquids whereas aqueous alcohol solutions were used to simulate the behavior of non-coalescing organic liquids.

The experimental results obtained with two different types of gas distributor in the coalescence solutions and in non coalescence solutions were compared with data on standard air–water system.

A computerized conductivity probe system and high speed digital camera were used for the systematic measurements of bubble size, velocity and gas hold-up.

Correlations based on dimensionless groups were proposed for the prediction of gas holdup and drag coefficient in the homogeneous flow regime.