An experimental and CFD analysis of a two-phase flow air induction nozzle with agricultural application

The two phase flow parametric study on the air induction nozzle is presented with water and air as working fluid where liquid was supplied at the pre-orifice with various inlet pressures ranged from 3 to 6 bar. The interaction between air and water at molecular level at the orifice exit leads to forming a strong shear layer intensified with increase in inlet pressure. Mean diameter and void fraction in each bubble and their individual shapes is adjusted prior to the desired criteria. Thus, it is vital to regulate the ratio of intake air to the supplied liquid so that the generated micro bubbles fit the design criteria. CFD analysis was accompanied via commercial software STAR CCM+ from cd-Adapco and validated against experimental data to find the most appropriate turbulence model. Then, the chosen model is used to investigate design parameters and their effect on the desired parameters. A volume of fluid (VOF) method of RANS models used to undertake the air-water interaction. Results of such comparison revealed minor priority of the Realizable k-ϵ to the k-ω model. In addition, the unsteady state solution presented remarkable predictions in compare to that of steady state solution in particular predicting air behaviour.