...–air flow petroleum wells annular ducts drift-flux void fraction Artificial lift techniques have greatly improved over the last decades in the oil and gas industry, with gas-lift and electrical submerged pumps (ESPs) being two of the most important overall. In the Brazilian production...

... entrained fraction void fraction annular Simultaneous flow of gas and liquid in a riser or any transport medium produces a large number of spatial configurations of the phases due to the deformable interface between them. These spatial configurations or phase distributions provide information...