Characteristics of droplet motion in effervescent sprays

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dc.contributor.authorJedelský, Jancs
dc.contributor.authorZaremba, Matoušcs
dc.contributor.authorMalý, Milancs
dc.contributor.authorJícha, Miroslavcs
dc.coverage.issue1cs
dc.coverage.volume67cs
dc.date.accessioned2020-08-04T14:57:48Z
dc.date.available2020-08-04T14:57:48Z
dc.date.issued2014-03-25cs
dc.description.abstractTime resolved droplet size and velocity measurement was made using Phase-Doppler anemometry in an effervescent spray at GLR of 6 % and operation pressure drops 21 – 52 kPa. The spray shows a size dependent variation of mean as well as fluctuating axial and radial velocities of droplets similarly for all operation regimes. Particles under 13 um follow the gas flow, axially decelerated due to gas expansion. Velocity of medium sized particles is positively size correlated and larger particles keep high velocity, given them during discharge. Fluctuating radial velocity of small particles is larger than that of large particles while fluctuating axial velocity increases with size. Small particles thus reach a ratio of radial to axial velocity fluctuations ~ 0.6 but large particles only ~ 0.1, which indicates large transverse dispersion of small particles. Overall fluctuating velocity ratios smaller than 0.5 document an anisotropic character of the liquid mass fluctuations. Power spectral density (PSD) of axial velocity fluctuations of large droplets is uniform up to 1 kHz, while PSD of smaller particles drops down with frequency for frequencies > 100 Hz. Large particles thus preserve the fluctuations imposed during discharge while the gas turbulence drops with frequency. Turbulence intensity reaches 14 to 21 % depending on pressure. Such high-turbulence character of the flow probably results from a heterogeneous gas–liquid mixture at the discharge.en
dc.description.abstractČlánek se věnuje popisu charakteristik pohybu kapek v effervescent sprejích. Vychází z dat Dopplerovské anemometrie, více v anglické verzi abstraktu.cs
dc.formattextcs
dc.format.extent334-339cs
dc.format.mimetypeapplication/pdfcs
dc.identifier.citationEPJ Web of Conferences. 2014, vol. 67, issue 1, p. 334-339.en
dc.identifier.doi10.1051/epjconf/20146702050cs
dc.identifier.isbn978-80-260-5375-0cs
dc.identifier.issn2100-014Xcs
dc.identifier.other104262cs
dc.identifier.urihttp://hdl.handle.net/11012/194723
dc.language.isoencs
dc.publisherEDP Sciencescs
dc.relation.ispartofEPJ Web of Conferencescs
dc.relation.urihttps://www.epj-conferences.org/articles/epjconf/abs/2014/04/epjconf_efm-13_02050/epjconf_efm-13_02050.htmlcs
dc.rightsCreative Commons Attribution 2.0 Genericcs
dc.rights.accessopenAccesscs
dc.rights.sherpahttp://www.sherpa.ac.uk/romeo/issn/2100-014X/cs
dc.rights.urihttp://creativecommons.org/licenses/by/2.0/cs
dc.subjectPhase-Doppler analyseren
dc.subjectdroplet motionen
dc.subjecteffervescent spraysen
dc.subjectTurbulence kinetic energyen
dc.subjectFrequency spectraen
dc.subjectPhase-Doppler analyser
dc.subjectpohyb kapek
dc.subjecteffervescent spreje
dc.subjectTurbulentní kinetická energie
dc.subjectFrekvenční spektra
dc.titleCharacteristics of droplet motion in effervescent spraysen
dc.title.alternativeCharakteristiky pohybu kapek v effervescent sprejíchcs
dc.type.driverconferenceObjecten
dc.type.statusPeer-revieweden
dc.type.versionpublishedVersionen
sync.item.dbidVAV-104262en
sync.item.dbtypeVAVen
sync.item.insts2020.08.04 16:57:48en
sync.item.modts2020.08.04 16:15:37en
thesis.grantorVysoké učení technické v Brně. Fakulta strojního inženýrství. Energetický ústavcs
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