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Influence of Dimensionless Temperature on Droplet Impact onto Heated Liquid Films for Subcooled Boiling Regimes

2022-09-06Conference object Open access
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dc.contributor.authorVasconcelos, Daniel
dc.contributor.authorSilva, A. R. R.
dc.contributor.authorBarata, Jorge M M
dc.date.accessioned2023-01-02T11:36:49Z
dc.date.available2023-01-02T11:36:49Z
dc.date.issued2022-09-06
dc.description.abstractHeat and mass transfer mechanisms related to multiphase flows occur in several applications such as spray cooling, quenching, internal combustion engines and plasma spraying. These mechanisms have become increasingly important due to the need of achieving higher heat rate coefficients associated with phase-change processes, such as evaporation and condensation. Specifically, the phenomenon of droplet impact onto non-heated liquid films has been extensively researched, both experimentally and numerically. However, the influence of temperature on droplet impact and liquid film stability has been overlooked in the literature, which is a focal point in understanding interfacial phenomena. The main objective of this work is to experimentally study droplet impact onto heated liquid films. Therefore, an experimental facility was designed for this purpose. A borosilicate glass surface is used to contain the liquid film. This surface is placed above an aluminium block with four embedded cartridge heaters of 250W each, heating the liquid film by conduction. Immersion type-k thermocouples are employed for liquid film temperature measurements. Liquid film evaporation rates are calculated in order to ensure the liquid film thickness prior to the droplet impact. Water and n-decane are the fluids adopted due to their differences in thermophysical properties and saturation temperature. The impact conditions are 100 < W e < 300, 0.5 < h* < 1.5, and a dimensionless temperature of θ < 0.6. Qualitative analysis is performed regarding crater and central jet evolution, and quantitative data regarding evaporation rate and central jet height are measured. The dimensionless temperature affects the droplet impact phenomena, creating recirculation zones near the crater and the impact surface, and affecting the crater formation. The central jet height increases with increasing values of θ for h* = 1.0 and h* = 1.5, whereas for h* = 0.5, the measurements do not follow a similar tendency. The emerging time of the central jet is delayed for higher values of θ, meaning that future studies regarding crater evolution should be considered. The dimensionless temperature also promotes central jet breakup, as well increasing the number of secondary droplets originated from the breakup.pt_PT
dc.description.sponsorshipFundação para a Ciência e a Tecnologiapt_PT
dc.description.versioninfo:eu-repo/semantics/publishedVersionpt_PT
dc.identifier.citationDaniel Vasconcelos, André Silva, Jorge Barata, "Influence of Dimensionless Temperature on Droplet Impact onto Heated Liquid Films for Subcooled Boiling Regimes", ILASS–Europe 2022, 31st Conference on Liquid Atomization and Spray Systems, Virtual, Israel, 6-8 September, 2022pt_PT
dc.identifier.urihttp://hdl.handle.net/10400.6/12555
dc.language.isoengpt_PT
dc.peerreviewedyespt_PT
dc.publisherILASS - Europe, Institute for Liquid Atomization and Spray Systemspt_PT
dc.relationAssociate Laboratory of Energy, Transports and Aeronautics
dc.relationDroplet Impact onto Heated Wetted Surfaces: A Fundamental Study
dc.relation.publisherversionhttps://ilass2022.net.technion.ac.il/index.php?gf-download=2022%2F06%2FILASS2022abs_exp_paper_DVR_final.pdf&form-id=4&field-id=8&hash=d5f8ef077b917ade1d1b99b316bc77b9a4ab9252773408f5b2e72081c0b1515ept_PT
dc.rights.urihttp://creativecommons.org/licenses/by/4.0/pt_PT
dc.subjectDroplet Impactpt_PT
dc.subjectDimensionless Temperaturept_PT
dc.subjectHeated Liquid Filmpt_PT
dc.subjectEvaporation Ratept_PT
dc.subjectCentral Jet Breakuppt_PT
dc.titleInfluence of Dimensionless Temperature on Droplet Impact onto Heated Liquid Films for Subcooled Boiling Regimespt_PT
dc.typeconference object
dspace.entity.typePublication
oaire.awardTitleAssociate Laboratory of Energy, Transports and Aeronautics
oaire.awardTitleDroplet Impact onto Heated Wetted Surfaces: A Fundamental Study
oaire.awardURIinfo:eu-repo/grantAgreement/FCT/6817 - DCRRNI ID/UIDB%2F50022%2F2020/PT
oaire.awardURIinfo:eu-repo/grantAgreement/FCT//SFRH%2FBD%2F143307%2F2019/PT
oaire.citation.conferencePlaceVirtual, Israelpt_PT
oaire.citation.titleILASS–Europe 2022, 31st Conference on Liquid Atomization and Spray Systemspt_PT
oaire.fundingStream6817 - DCRRNI ID
person.familyNameRodrigues
person.familyNameResende Rodrigues da Silva
person.familyNameMartins Barata
person.givenNameDaniel de Almeida Vasconcelos
person.givenNameAndré
person.givenNameJorge Manuel
person.identifierJ-4185-2012
person.identifierhFY_5JYAAAAJ&hl
person.identifier.ciencia-id2A1A-1CBC-9E37
person.identifier.ciencia-id8219-4B2B-E1C7
person.identifier.ciencia-idF611-BBCC-DAA8
person.identifier.orcid0000-0003-0918-6879
person.identifier.orcid0000-0002-4901-7140
person.identifier.orcid0000-0001-9014-5008
person.identifier.scopus-author-id11440407500
person.identifier.scopus-author-id11439470600
project.funder.identifierhttp://doi.org/10.13039/501100001871
project.funder.identifierhttp://doi.org/10.13039/501100001871
project.funder.nameFundação para a Ciência e a Tecnologia
project.funder.nameFundação para a Ciência e a Tecnologia
rcaap.rightsopenAccesspt_PT
rcaap.typeconferenceObjectpt_PT
relation.isAuthorOfPublication43054ee7-4db6-44bd-a87c-b9e3f461d4e5
relation.isAuthorOfPublication908e150d-3890-457c-b5da-09c84671cb93
relation.isAuthorOfPublicationc4346556-933d-4f70-9b6d-8e1670d57be6
relation.isAuthorOfPublication.latestForDiscovery908e150d-3890-457c-b5da-09c84671cb93
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