Abstract
Air induction nozzle has been used in many applications to decrease the drift potential and increase the crop protection efficacy. The efficient operation and design of these nozzles require understanding the flow characteristics inside the nozzle. Compared to other types of nozzles the studies related to air induction nozzles are very limited especially those concerned with the internal flow. The most important parameter that characterizes the operation of AIN is the air-liquid ratio. There are no studies investigate the effect of internal flow behavior and geometric parameters on the air-liquid ratio. Therefore, the main goal of this study is to investigate the influence of geometric parameters on air-liquid ratio based on the internal flow characteristics. The volume of fluid (VOF) method was used to investigate the internal flow characteristics of an air induction nozzle (AIN). The effect of internal flow characteristics on the air-liquid ratio (ALR) that defined as the ratio between air to liquid mass flowrates was studied. The analysis results of the air-liquid ratio were validated via comparison with the experimental results. The simulations were carried out using the STAR CCM+ software. Different mesh sizes and turbulence models were tested to achieve the best results agree with experimental results. The realizable k-ε turbulence model and mesh with a base size of 0.07 mm at throat diameter of 14 mm and diffuser angle of 20O had the best results so the internal flow was studied using these parameters. The results demonstrated that the performance of AIN represented by ALR was affected by the internal flow characteristics such as velocity, pressure, and film thickness. The effect of diameter ratio (the ratio of throat diameter to pre-orifice diameter) and diffuser angles on the ALR was also investigated. Increasing diameter ratio resulted in increasing ALR at a certain value and then decreased. While increasing diffuser angle resulted in a slight increase in the ALR with further reduction at a diffuser angle of 40O.
Published Version
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