Numerical studies of bubble formation dynamics in gas-liquid interaction using Volume of Fluid (VOF) method

This work aims to investigate the bubble generation and its behavior during two-phase interaction using the Volume of Fluid (VOF) method for interface capturing and reconstruction. The conservation equations of mass and momentum are computed in real time taking into account surface tension and gravity. Pressure-velocity coupling is achieved through the PISO scheme and the interface was reconstructed using the geo-reconstruct PLIC scheme. The obtained results of bubble behaviors are in solidarity with the available literature. Gas (air) was injected in the liquid water through an orifice of 1 mm diameter located in the bottm wall. Influence of surface tension and orifice properties including inlet orifice velocity, orifice diameter on bubble generation and dynamics were analyzed considering the orifice on the bottom wall. The increase in surface tension is directly proportional to bubble diameter and the time taken for detachment. Detachment time behaves inversely with increasing gas velocity. The presence of two orifices and the influence of the spacing between them on bubble dynamics was also investigated.