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dc.contributor.authorHasslberger, J
dc.contributor.authorOzel-Erol, G
dc.contributor.authorChakraborty, N
dc.contributor.authorKlein, M
dc.contributor.authorCant, S
dc.date.accessioned2021-04-13T09:57:05Z
dc.date.available2021-04-13T09:57:05Z
dc.date.issued2021-07
dc.identifier.issn0010-2180
dc.identifier.urihttps://www.repository.cam.ac.uk/handle/1810/319804
dc.description.abstractThree-dimensional carrier-phase Direct Numerical Simulations (DNS), combined with a Lagrangian representation of individual droplets, have been employed in this parametric study to examine the physical effects of liquid water mist interacting with laminar and turbulent premixed stoichiometric n-heptane air flames. Significant reductions of flame temperature and burning velocity have been observed in the presence of water droplets. In agreement with the laws governing evaporation, a strongly non-linear influence of the droplet size on the overall burning rate has been noted, whereas the influence of water loading is fairly linear. Different regimes of droplet-flame interaction are known to exist and this has been investigated by numerical experiments focusing on the influence of the latent heat of vaporization. When using realistic fluid properties of water, the cooling effect due to the enthalpy sink of evaporating droplets outweighs the dilution effect due to the local release of steam. Under turbulent conditions, the effectiveness of the droplets in reducing the overall burning rate changes owing to the transient nature of the droplet-flame interaction. Furthermore, it was found that the evaporating droplets significantly diminish the flame-generated turbulence and this leads to weaker turbulent wrinkling of the flame surface as compared to gaseous premixed reference simulations without droplets. Based on a comparison of the time scales representing droplet evaporation and the droplet residence time within the flame, a reduced-order model is proposed to account for both the cooling and dilution effects with respect to flame temperature and laminar burning velocity.
dc.description.sponsorshipDAAD
dc.publisherElsevier BV
dc.rightsAll rights reserved
dc.titlePhysical effects of water droplets interacting with turbulent premixed flames: A Direct Numerical Simulation analysis
dc.typeArticle
prism.publicationDate2021
prism.publicationNameCombustion and Flame
prism.volume229
dc.identifier.doi10.17863/CAM.66929
dcterms.dateAccepted2021-03-01
rioxxterms.versionofrecord10.1016/j.combustflame.2021.111404
rioxxterms.versionAM
rioxxterms.licenseref.urihttp://www.rioxx.net/licenses/all-rights-reserved
rioxxterms.licenseref.startdate2021-07-01
dc.contributor.orcidHasslberger, J [0000-0003-3865-7035]
dc.identifier.eissn1556-2921
rioxxterms.typeJournal Article/Review
cam.orpheus.successMon Apr 19 07:30:34 BST 2021 - Embargo updated
rioxxterms.freetoread.startdate2022-07-01


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