Campus Units

Mechanical Engineering, Chemical and Biological Engineering

Document Type

Article

Publication Version

Accepted Manuscript

Publication Date

2020

Journal or Book Title

Atomization and Sprays

Volume

30

Issue

6

First Page

389

Last Page

400

DOI

10.1615/AtomizSpr.2020034840

Abstract

Coaxial atomizing sprays are used in industries from gas turbines to food processing. Spray dynamics depend heavily on the primary breakup (near-field) region. The near-field region is challenging to study because it contains thick liquid that is impenetrable to visible light. However, X-ray radiographs are capable of penetrating the dense liquid region, providing insight that is unavailable from visible light testing methods. This study modifies a method used in previous studies for determining the mass-averaged axial velocity from a narrow-angle, injection spray, into a method for studying the mass-averaged axial velocity from a wide-angle, constant spray. Experiments at the Advanced Photon Source at Argonne National Laboratory provided focused-beam X-ray radiographs along the spray. Results showed that the mass-averaged axial velocity along a coaxial spray increased linearly with axial distance from the nozzle for varying momentum ratios. The slope of the velocity-distance relation also increased linearly when plotted as a function of gas Reynolds number. Spray velocity is often considered for individual droplets or for the centerline, but not as a mass-averaged property. However, these results show that the mass-averaged axial velocity has predictable behavior in the near-field region for the conditions that were tested in this study.

Comments

This is a manuscript an an article published as Bothell, Julie K., Timothy B. Morgan, Alan L. Kastengren, and T. J. Heindel. "Determining Spray Axial Velocity From Focused X-ray Radiography." Atomization and Sprays 30, no. 6 (2020). DOI: 10.1615/AtomizSpr.2020034840. Posted with permission.

Copyright Owner

Begell House

Language

en

File Format

application/pdf

Available for download on Thursday, October 21, 2021

Published Version

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