Synchrotron radiography characterization of the liquid core dynamics in a canonical two-fluid coaxial atomizer

dc.contributor.author Machicoane, Nathanael
dc.contributor.author Bothell, Julie
dc.contributor.author Li, Danyu
dc.contributor.author Morgan, Timothy
dc.contributor.author Heindel, Theodore
dc.contributor.author Kastengren, Alan
dc.contributor.author Aliseda, Alberto
dc.contributor.department Mechanical Engineering
dc.contributor.department Electrical and Computer Engineering
dc.date 2019-04-21T18:45:23.000
dc.date.accessioned 2020-06-30T06:04:59Z
dc.date.available 2020-06-30T06:04:59Z
dc.date.copyright Tue Jan 01 00:00:00 UTC 2019
dc.date.embargo 2021-03-13
dc.date.issued 2019-01-01
dc.description.abstract <p>The liquid core of a canonical two-fluid coaxial atomizer has been characterized using synchrotron X-rays. The high energy photons allow for high-speed imaging of attenuation through the dense liquid-gas jet core, resolving the internal structures that include entrapped air bubbles and the formation of liquid ligaments and bags. When the gas-to-liquid momentum ratio increases, the liquid core transitions from an intact column, where primary break-up happens several liquid diameters downstream, to a hollow crown with a downstream span comparable to the liquid diameter that disintegrates by shedding ligaments from its rim. At high gas momentum ratios (limited by the sonic velocity at the gas nozzle exit), this crown suffers partial dewetting and, when angular momentum is added to the gas, it dewets on a large section of the liquid injection needle circumference. This partial crown exhibits azimuthal motions along the circumference, on timescales much longer than the relevant flow timescales. The crown attachment to the liquid needle presents a bi-stable nature. The dramatic changes of the liquid core morphology, as the gas momentum and swirl ratios vary, have a strong impact on the gas-liquid boundary layers, which control the liquid break-up mechanisms and the resulting spray characteristics, such as droplet size distributions and the droplet volume fraction across the spray.</p>
dc.description.comments <p>This is a manuscript of an article published as Machicoane, Nathanael, Julie K. Bothell, Danyu Li, Timothy B. Morgan, Theodore J. Heindel, Alan L. Kastengren, and Alberto Aliseda. "Synchrotron radiography characterization of the liquid core dynamics in a canonical two-fluid coaxial atomizer." <em>International Journal of Multiphase Flow</em> (2019). DOI: <a href="http://dx.doi.org/10.1016/j.ijmultiphaseflow.2019.03.006" target="_blank">10.1016/j.ijmultiphaseflow.2019.03.006</a>. Posted with permission.</p>
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dc.identifier archive/lib.dr.iastate.edu/me_pubs/341/
dc.identifier.articleid 1343
dc.identifier.contextkey 14049645
dc.identifier.s3bucket isulib-bepress-aws-west
dc.identifier.submissionpath me_pubs/341
dc.identifier.uri https://dr.lib.iastate.edu/handle/20.500.12876/55211
dc.language.iso en
dc.source.bitstream archive/lib.dr.iastate.edu/me_pubs/341/2019_HeindelTheodore_SynchrontronRadiography.pdf|||Fri Jan 14 23:41:40 UTC 2022
dc.source.uri 10.1016/j.ijmultiphaseflow.2019.03.006
dc.subject.disciplines Mechanical Engineering
dc.subject.keywords Atomization
dc.subject.keywords Flow instabilities
dc.subject.keywords High-speed white beam imaging
dc.subject.keywords Ligaments and droplets
dc.subject.keywords Spray
dc.subject.keywords Synchrotron X-rays
dc.title Synchrotron radiography characterization of the liquid core dynamics in a canonical two-fluid coaxial atomizer
dc.type article
dc.type.genre article
dspace.entity.type Publication
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relation.isOrgUnitOfPublication 6d38ab0f-8cc2-4ad3-90b1-67a60c5a6f59
relation.isOrgUnitOfPublication a75a044c-d11e-44cd-af4f-dab1d83339ff
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