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

Theodore J. Heindel
Center for Multiphase Flow Research and Education (CoMFRE), Department of Mechanical Engineering, Iowa State University, Ames, IA 50011-2161, USA

Julie K. Bothell
Center for Multiphase Flow Research and Education, Department of Mechanical Engineering, Iowa State University, USA

Thomas J. Burtnett
Iowa State University, Ames, IA 50011-2161, USA

Danyu Li
Center for Multiphase Flow Research and Education, Department of Mechanical Engineering, Iowa State University, USA

Timothy B. Morgan
Iowa State University, Ames, IA 50011-2161, USA

Alberto Aliseda
Department of Mechanical Engineering, University of Washington, Seattle, WA 98195-2600, USA

Nathanaël Machicoane
Department of Mechanical Engineering, University of Washington, Seattle, WA 98195-2600, USA

Katarzyna E. Matusik
X-Ray Science Division, Argonne National Laboratory, Lemont, Illinois 60439, USA

Alan L. Kastengren
X-Ray Science Division, Advanced Photon Source, Argonne National Laboratory, Lemont, Illinois 60439, USA

DOI: 10.1615/TFEC2019.spr.028854
pages 1705-1708


KEY WORDS: Airblast atomizer, Electrified nozzle, Equivalent path length, Sprays, Synchrotron X-rays, X-ray imaging

Abstract

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 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.

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