Liquid sprays play a key role in many engineering processes (e.g., food processing, coating and painting, 3D printing, fire suppression, agricultural production, combustion systems, etc.). Spray characteristics can easily be assessed in the mid- and far-field regions, well after liquid sheet breakup and droplet formation, using various optical/laser diagnostic techniques. The conditions in the near-field region, near the spray nozzle exit, can influence mid- and far-field characteristics; however, near-field measurements are extremely challenging because the spray in this region is typically optically dense and optical/laser diagnostics are ineffective in this region. This study presents the advantages and challenges of using broadband X-rays to characterize the near-field region of a spray. A generic spiral jet hollow cone spray nozzle is used to demonstrate near-field spray imaging for three different flow conditions. Radiographic movies of the spray show a very dynamic near-field region. X-ray computed tomography (CT) reconstructions of the spray display a 3D map of the time-average spray distribution. The two X-ray imaging modes provide qualitative information of the near-field spray region. A discussion of the quantitative measures that can be acquired from X-ray radiographs and CT images is provided.
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ASME 2017 Fluids Engineering Division Summer Meeting
July 30–August 3, 2017
Waikoloa, Hawaii, USA
Conference Sponsors:
- Fluids Engineering Division
ISBN:
978-0-7918-5805-9
PROCEEDINGS PAPER
Visualizing Near-Field Spray Characteristics With Broadband X-Rays Available to Purchase
Timothy B. Morgan,
Timothy B. Morgan
Iowa State University, Ames, IA
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Luke D. Pulfer,
Luke D. Pulfer
Iowa State University, Ames, IA
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Theodore J. Heindel
Theodore J. Heindel
Iowa State University, Ames, IA
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Danyu Li
Iowa State University, Ames, IA
Timothy B. Morgan
Iowa State University, Ames, IA
Luke D. Pulfer
Iowa State University, Ames, IA
Theodore J. Heindel
Iowa State University, Ames, IA
Paper No:
FEDSM2017-69088, V01BT06A005; 5 pages
Published Online:
October 24, 2017
Citation
Li, D, Morgan, TB, Pulfer, LD, & Heindel, TJ. "Visualizing Near-Field Spray Characteristics With Broadband X-Rays." Proceedings of the ASME 2017 Fluids Engineering Division Summer Meeting. Volume 1B, Symposia: Fluid Measurement and Instrumentation; Fluid Dynamics of Wind Energy; Renewable and Sustainable Energy Conversion; Energy and Process Engineering; Microfluidics and Nanofluidics; Development and Applications in Computational Fluid Dynamics; DNS/LES and Hybrid RANS/LES Methods. Waikoloa, Hawaii, USA. July 30–August 3, 2017. V01BT06A005. ASME. https://doi.org/10.1115/FEDSM2017-69088
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