Experimental and Numerical Investigation of Pressure Swirl Atomizers

Abstract

The prediction of droplet size distributions for atomization nozzles is important for process design and improvement of industrial spraying processes. However, especially for non-Newtonian liquids, the published research applicable for engineering purposes is rare. To derive fundamental correlations for droplet size distributions in the future, the multiphase flow inside the spray nozzle is investigated by computational fluid dynamics, and measurements of droplet size distributions are done under the same flow conditions. In the present paper, two different hollow-cone nozzles were investigated using the volume-of-fluid method with largeeddy turbulence modeling inside the open source software OpenFOAM®. An experimental test rig suitable for spraying organic solvents was built.

Atomization and Mixing Characteristics of Swirl‐Flow Atomizers in the Refining Industry

“…The effect of airflow on spatial velocity distribution in the absence of airflow (case a), when Q a = 1000 m 3 h -1 (case b), and when Q w = 0.52 m film. This result is in accordance with the finding of Renze and Zhang [16,29].…”

“…Renze and Soni [13,16] confirmed that the main reason for liquid film breakage is under the effect of surface tension and viscosity force. Moreover, external action will change the shape of swirl atomization and affect the degree of droplet refinement and fragmentation.…”

“…Hassani et al [8] used Taylor analogy-breaking (TAB) and Reitz-Diwakar models to characterize the secondary atomization of droplets and discovered that the TAB model reaches stability within a shorter time. Renze et al [16] adopted the volume-of-fluid (VOF) method to simulate singlephase flow atomization. Although liquid film separation can be realized under fine-mesh conditions, the computational efficiency and liquid film fragmentation integrity still need to be improved.…”

Analysis of viscous fluid flow in a pressure-swirl atomizer using large-eddy simulation

“…Binnie and Harris (1950) studied the effect of surface tension for the dynamics of the air core theoretically and concluded that it is negligible. Numerical studies on pressure-swirl atomizer inner nozzle flow are numerous but relevant for this study are the works of Dash et al (2001), Fu (2016), Galbiati et al (2016b) and Renze et al (2011).…”

Design and construction of the pressure swirl nozzle and experimental investigation of spray characteristics

“…The prediction of droplet size distributions for atomization nozzles is important for the process design and the improvement of industrial spraying processes [1]. In one of the recent researches, the spray flow structure, droplet Sauter mean diameter, and droplet impingement energy were characterized at predefined axial distances and pressure drops.…”