A computational study of droplet evaporation with fuel vapor jet ejection induced by localized heat sources

Handle URI:
http://hdl.handle.net/10754/552984
Title:
A computational study of droplet evaporation with fuel vapor jet ejection induced by localized heat sources
Authors:
Sim, Jaeheon ( 0000-0003-1441-7344 ) ; Im, Hong G. ( 0000-0001-7080-1266 ) ; Chung, Suk-Ho ( 0000-0001-8782-312X )
Abstract:
Droplet evaporation by a localized heat source under microgravity conditions was numerically investigated in an attempt to understand the mechanism of the fuel vapor jet ejection, which was observed experimentally during the flame spread through a droplet array. An Eulerian-Lagrangian method was implemented with a temperature-dependent surface tension model and a local phase change model in order to effectively capture the interfacial dynamics between liquid droplet and surrounding air. It was found that the surface tension gradient caused by the temperature variation within the droplet creates a thermo-capillary effect, known as the Marangoni effect, creating an internal flow circulation and outer shear flow which drives the fuel vapor into a tail jet. A parametric study demonstrated that the Marangoni effect is indeed significant at realistic droplet combustion conditions, resulting in a higher evaporation constant. A modified Marangoni number was derived in order to represent the surface force characteristics. The results at different pressure conditions indicated that the nonmonotonic response of the evaporation rate to pressure may also be attributed to the Marangoni effect.
KAUST Department:
Clean Combustion Research Center
Citation:
A computational study of droplet evaporation with fuel vapor jet ejection induced by localized heat sources 2015, 27 (5):053302 Physics of Fluids
Journal:
Physics of Fluids
Issue Date:
12-May-2015
DOI:
10.1063/1.4919809
Type:
Article
ISSN:
1070-6631; 1089-7666
Additional Links:
http://scitation.aip.org/content/aip/journal/pof2/27/5/10.1063/1.4919809
Appears in Collections:
Articles; Clean Combustion Research Center

Full metadata record

DC FieldValue Language
dc.contributor.authorSim, Jaeheonen
dc.contributor.authorIm, Hong G.en
dc.contributor.authorChung, Suk-Hoen
dc.date.accessioned2015-05-17T20:22:25Zen
dc.date.available2015-05-17T20:22:25Zen
dc.date.issued2015-05-12en
dc.identifier.citationA computational study of droplet evaporation with fuel vapor jet ejection induced by localized heat sources 2015, 27 (5):053302 Physics of Fluidsen
dc.identifier.issn1070-6631en
dc.identifier.issn1089-7666en
dc.identifier.doi10.1063/1.4919809en
dc.identifier.urihttp://hdl.handle.net/10754/552984en
dc.description.abstractDroplet evaporation by a localized heat source under microgravity conditions was numerically investigated in an attempt to understand the mechanism of the fuel vapor jet ejection, which was observed experimentally during the flame spread through a droplet array. An Eulerian-Lagrangian method was implemented with a temperature-dependent surface tension model and a local phase change model in order to effectively capture the interfacial dynamics between liquid droplet and surrounding air. It was found that the surface tension gradient caused by the temperature variation within the droplet creates a thermo-capillary effect, known as the Marangoni effect, creating an internal flow circulation and outer shear flow which drives the fuel vapor into a tail jet. A parametric study demonstrated that the Marangoni effect is indeed significant at realistic droplet combustion conditions, resulting in a higher evaporation constant. A modified Marangoni number was derived in order to represent the surface force characteristics. The results at different pressure conditions indicated that the nonmonotonic response of the evaporation rate to pressure may also be attributed to the Marangoni effect.en
dc.relation.urlhttp://scitation.aip.org/content/aip/journal/pof2/27/5/10.1063/1.4919809en
dc.rightsArchived with thanks to Physics of Fluidsen
dc.titleA computational study of droplet evaporation with fuel vapor jet ejection induced by localized heat sourcesen
dc.typeArticleen
dc.contributor.departmentClean Combustion Research Centeren
dc.identifier.journalPhysics of Fluidsen
dc.eprint.versionPublisher's Version/PDFen
kaust.authorSim, Jaeheonen
kaust.authorIm, Hong G.en
kaust.authorChung, Suk-Hoen
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