THE EFFECT OF NOZZLE ELECTRIFICATION ON SPRAY FORMATION FROM AN AIRBLAST ATOMIZER

Theodore J. Heindel, Julie K. Bothell, Thomas J. Burtnett, Danyu Li, Timothy B. Morgan, Alberto Aliseda, Nathanaël Machicoane, Katarzyna E. Matusik, Alan L. Kastengren
2019 Proceeding of 4th Thermal and Fluids Engineering Conference   unpublished
Liquid sprays play a key role in many engineering processes (e.g., food processing, coating and painting, 3D printing, fire suppression, combustion systems, etc.). The conditions at the nozzle exit have a large influence on the downstream spray characteristics. However, characterizing the spray in this region is extremely challenging because under most operating conditions the spray is optically dense. High intensity white beam X-ray imaging and focused beam radiography, like that available at
more » ... that available at the Advanced Photon Source (APS) at Argonne National Laboratory, can be used to produce time-resolved visualizations and measurements of the spray near-field region. In this study, high spatially-and temporally-resolved X-ray data are acquired of a canonical airblast atomizer consisting of coaxial water and air jets. The liquid is charged by flowing it through a metallic duct electrified to -5 kV with the motivation to enhance the atomization process. High-speed X-ray images and measured equivalent path lengths are compared with and without the electric potential and with and without gas swirl. It is shown that the electrification of the liquid needle has a negligible effect in the spray near-field for the conditions used in this study.
doi:10.1615/tfec2019.spr.028854 fatcat:spllw3teqbh3hpqm6dnmz4kyrq