Show simple item record

dc.contributor.authorGuida, Paolo
dc.contributor.authorCeschin, Alberto
dc.contributor.authorSaxena, Saumitra
dc.contributor.authorIm, Hong G.
dc.contributor.authorRoberts, William L.
dc.date.accessioned2022-01-27T11:40:56Z
dc.date.available2022-01-27T11:40:56Z
dc.date.issued2022-01-25
dc.date.submitted2021-05-19
dc.identifier.citationGuida, P., Ceschin, A., Saxena, S., Im, H. G., & Roberts, W. L. (2022). A computational study of thermally induced secondary atomization in multicomponent droplets. Journal of Fluid Mechanics, 935. doi:10.1017/jfm.2022.3
dc.identifier.issn0022-1120
dc.identifier.issn1469-7645
dc.identifier.doi10.1017/jfm.2022.3
dc.identifier.urihttp://hdl.handle.net/10754/675172
dc.description.abstractThis study presents computational simulations of multicomponent and multiphase flows to reproduce the physical phenomena in the secondary atomization of a droplet induced by a hot temperature environment. The computational fluid dynamics model is based on the geometric volume of fluid method, with piecewise linear interface calculation reconstruction for accurate determination of the curvature and evaporation fluxes at the interface. The purpose of the model was to faithfully reproduce complex physical processes, such as internal gas cavity formation, liquid–vapour interface instability, cavity collapse and liquid jet ejection, and the pinch-off of a secondary droplet, leading to the microexplosion phenomenon that greatly enhances the evaporation rate of non-volatile liquid droplets. The solver was validated against the analytical solution in benchmark cases, and experimental data with bicomponent droplets reported in the literature. The developed model was used to predict the atomization of heavy fuel oil exposed at high temperatures under microgravity conditions. Different atomization regimes were identified, depending on the initial size of the internal bubbles. While small bubbles led to simple gas ejections, cavity collapse caused the larger bubbles to produce a jet formation. When the ratio between the bubble and droplet volumes was bigger than 0.7, microexplosions occurred. The results were found to be consistent with cases of bubble burst on flat surfaces, showing a strong dependence on the Ohnesorge number (Oh). Key observable quantities, particularly jet velocity and bubble cap drainage velocity, were found to agree with correlations reported in other studies. The similarities were also supported by studies extending over a wide range of simulations (4000 cases) at different Oh. An inversion in the dependence of the jet velocity on Oh (above a critical value Ohc) was observed.
dc.description.sponsorshipThe work was sponsored by the Clean Combustion Research Center at King Abdullah University of Science and Technology (KAUST). Computational resources were provided by the KAUST Supercomputing Laboratory (KSL).
dc.publisherCambridge University Press (CUP)
dc.relation.urlhttps://www.cambridge.org/core/product/identifier/S0022112022000039/type/journal_article
dc.rightsArchived with thanks to Journal of Fluid Mechanics
dc.titleA computational study of thermally induced secondary atomization in multicomponent droplets
dc.typeArticle
dc.contributor.departmentMechanical Engineering Program
dc.contributor.departmentPhysical Science and Engineering (PSE) Division
dc.contributor.departmentMechanical Engineering
dc.contributor.departmentClean Combustion Research Center
dc.identifier.journalJournal of Fluid Mechanics
dc.rights.embargodate2022-07-25
dc.eprint.versionPost-print
dc.identifier.volume935
kaust.personGuida, Paolo
kaust.personCeschin, Alberto
kaust.personSaxena, Saumitra
kaust.personIm, Hong G.
kaust.personRoberts, William L.
dc.date.accepted2021-12-29
kaust.acknowledged.supportUnitClean Combustion Research Center
kaust.acknowledged.supportUnitKAUST Supercomputing Laboratory (KSL)


This item appears in the following Collection(s)

Show simple item record