Characteristics of bubbles and gas holdup in a two-phase column for different liquid phases

Abstract EN

Experimental study of gas holdup (Eg), bubble diameter (dvs) interfacial area (a) m-1, small bubble rise velocity (Ubs), and bubble rise velocity (Ubr) in (0.1m i.d) and (1.5m) high column operated at ambient temperature and pressure conditions.

The superficial gas velocity (Ug) was varied in the range of (0-0.3) m/s, spanning both the homogenous and heterogeneous flow regimes.

Air was used as the gas phase.

Different liquids were used as liquid phase (Water, Ethanol, Butanol, paraffin oil solutions ).

Experimental results shows that the influence of liquid properties on (Eg) is considerable, where the lower surface tension (s ) gives a lower (Ubr) and therefore a higher (Eg).

High viscosity (mL ) leads to large bubbles and therefore a low (Eg) and (a) , for coalescence liquids bubble diameter increases with increasing gas velocity.

A correlation based on dimensionless groups for the predicition of (Eg) liquid properties is proposed, and found to be in good agreement with the experimental data.