The effect of Weber number on the central binary collision outcome between unequal-sized droplets

Nikolopoulos, N; Strotos, G; Nikas, KS; Bergeles, G

dc.contributor.author	Nikolopoulos, N	en
dc.contributor.author	Strotos, G	en
dc.contributor.author	Nikas, KS	en
dc.contributor.author	Bergeles, G	en
dc.date.accessioned	2014-03-01T02:14:48Z
dc.date.available	2014-03-01T02:14:48Z
dc.date.issued	2012	en
dc.identifier.issn	00179310	en
dc.identifier.uri	https://dspace.lib.ntua.gr/xmlui/handle/123456789/30127
dc.subject	Binary collision	en
dc.subject	Droplet mixing	en
dc.subject	Satellite droplets	en
dc.subject	V.O.F	en
dc.subject.other	Axisymmetric	en
dc.subject.other	Binary collisions	en
dc.subject.other	Colliding droplets	en
dc.subject.other	Collision process	en
dc.subject.other	Droplet diameters	en
dc.subject.other	Experimental data	en
dc.subject.other	Gasphase	en
dc.subject.other	Local grid refinement	en
dc.subject.other	Mass transfer mechanism	en
dc.subject.other	Momentum equation	en
dc.subject.other	Non-dimensional parameters	en
dc.subject.other	Relative velocity	en
dc.subject.other	Satellite droplets	en
dc.subject.other	Total energy	en
dc.subject.other	Transport equation	en
dc.subject.other	V.O.F	en
dc.subject.other	Volume of fluids	en
dc.subject.other	Weber numbers	en
dc.subject.other	Numerical methods	en
dc.subject.other	Phase interfaces	en
dc.subject.other	Drop breakup	en
dc.title	The effect of Weber number on the central binary collision outcome between unequal-sized droplets	en
heal.type	journalArticle	en
heal.identifier.primary	10.1016/j.ijheatmasstransfer.2011.12.017	en
heal.identifier.secondary	http://dx.doi.org/10.1016/j.ijheatmasstransfer.2011.12.017	en
heal.publicationDate	2012	en
heal.abstract	The central binary collision of two unequal sized droplets is numerically investigated using the volume of fluid (V.O.F.) methodology. The numerical method based on the solution of the continuity and momentum equations in axi-symmetric formulation is coupled with a recently developed adaptive local grid refinement technique, thus allowing an accurate representation of the interface between the liquid and gas phase. Mass transfer mechanisms are reproduced by solving a transport equation for a colour function representing the mass of one of the colliding droplets before and after collision and mixing. The investigation is performed assuming either constant relative velocity of the colliding droplets or constant total energy of the system, thus creating a combination of the standard non-dimensional parameters affecting the collision process, i.e. Weber (We) and Ohnesorge (Oh) numbers as also droplet diameter ratio (Δ). The reliability of the procedure is first established by comparing predictions with available experimental data. The effect of the above mentioned parameters on ligament's formation, maximum deformation of the two droplets, the penetration of one droplet into the other and satellite droplet formation is quantified. © 2011 Elsevier Ltd. All rights reserved.	en
heal.journalName	International Journal of Heat and Mass Transfer	en
dc.identifier.doi	10.1016/j.ijheatmasstransfer.2011.12.017	en
dc.identifier.volume	55	en
dc.identifier.issue	7-8	en
dc.identifier.spage	2137	en
dc.identifier.epage	2150	en