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Communication Dans Un Congrès Année : 2017

X-ray Observations in the Spray Near-Field using Synchrotron X-rays

Theodore J Heindel
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Danyu Li
  • Fonction : Auteur
Timothy B. Morgan
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Julie K Bothell
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Nathanaël Machicoane

Résumé

The ability to control spray formation and dispersion is extremely important to many spray applications such as combustion systems, coating and painting methods, 3D printing processes, and fire suppression designs. The ultimate outcome of our ONR Multidisciplinary University Research Initiative (MURI) project is to demonstrate multiphysics control of liquid sprays issuing from airblast atomizers through the novel integration of advanced diagnostics and the application of data-and simulation-driven model reduction in easy-to-implement control algorithms. Some of the advanced diagnostics used in this project to better understand spray formation include: (1) 2D X-ray radiography and 3D X-ray computed tomography obtained from common tube X-ray sources, and (2) high-speed 2D radiographic movies and detailed 2D density projections from high intensity white beam and focused beam radiography from a synchrotron X-ray source. All of these techniques will focus on imaging the near-field region of the spray. This paper will provide initial X-ray spray imaging observations that were recently recorded using the Advanced Photon Source (APS) at Argonne National Laboratory. Initial high-speed X-ray images from an airblast atomizer are presented, where the inner liquid flow is laminar (Rel = 1000) and the outer air flow is turbulent (Reg = 16,700), with and without gas swirl. Radiographic movies of the atomizer show a very dynamic near-field region, including bag formation and stable air bubble formation inside liquid drops. When air swirl is added, the liquid stream is very unstable near the nozzle exit. A discussion of the quantitative measures that can be acquired from the qualitative white beam images and focused beam radiographic measurements will also be provided. Eventually, these data will be compared to near-field simulations performed at Cornell University and to mid-field measurements completed at the University of Washington-Seattle using an identical flow system .
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Dates et versions

hal-02513541 , version 1 (20-03-2020)

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  • HAL Id : hal-02513541 , version 1

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Theodore J Heindel, Danyu Li, Timothy B. Morgan, Julie K Bothell, Alberto Aliseda, et al.. X-ray Observations in the Spray Near-Field using Synchrotron X-rays. ILASS-Americas 29th Annual Conference on Liquid Atomization and Spray Systems, May 2017, atlanta, United States. ⟨hal-02513541⟩
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