Numerical analysis of air-water flow in horizontal duct

Multiphase flows are a common phenomenon observed in both natural environments as well as in various industries, including chemical, nuclear, and mining sectors. Such flows are characterized by the presence of more than one phase. This study analyses the air-water two-phase flow in a horizontal duct. The primary objective of this research is to investigate how different air nozzle diameters affect the development of the flow and the formation of different airwater structures, including bubble flow patterns and flow regimes. In addition, the study evaluates how initial parameters, such as the mass flow rate of air and water, influence the overall distribution of the phases within the horizontal duct. Numerical simulations were carried out using the Volume of Fluid method to track the interface between the phases. The results provide insight into phase distributions and velocity fields for both fluid and gas phases. These findings contribute to improving the predictive modelling of multiphase systems and offer valuable implications for industrial applications where control and accurate prediction of two-phase flow dynamics are essential for operational safety and performance. The analysis also highlights the significance of the nozzle diameter on phase distribution in the air-water channel flow.