Off-centre binary collision of droplets: A numerical investigation

Nikolopoulos, N; Theodorakakos, A; Bergeles, G

dc.contributor.author	Nikolopoulos, N	en
dc.contributor.author	Theodorakakos, A	en
dc.contributor.author	Bergeles, G	en
dc.date.accessioned	2014-03-01T01:31:30Z
dc.date.available	2014-03-01T01:31:30Z
dc.date.issued	2009	en
dc.identifier.issn	00179310	en
dc.identifier.uri	https://dspace.lib.ntua.gr/xmlui/handle/123456789/19806
dc.subject	Binary collision	en
dc.subject	Ligament	en
dc.subject	Satellite droplet formation	en
dc.subject	Volume of Fluid Method	en
dc.subject.other	Binary collision	en
dc.subject.other	Binary collisions	en
dc.subject.other	Colliding droplets	en
dc.subject.other	Collision process	en
dc.subject.other	Equal sizes	en
dc.subject.other	Experimental data	en
dc.subject.other	Finite volume	en
dc.subject.other	Gas bubble	en
dc.subject.other	Gaseous phase	en
dc.subject.other	Geometrical characteristics	en
dc.subject.other	Impact-parameter	en
dc.subject.other	Liquid gas interface	en
dc.subject.other	Liquid Phase	en
dc.subject.other	Local grid refinement	en
dc.subject.other	Numerical investigations	en
dc.subject.other	Numerical results	en
dc.subject.other	Numerical solution	en
dc.subject.other	Pinchoff	en
dc.subject.other	Pressure field	en
dc.subject.other	Satellite droplet formation	en
dc.subject.other	Satellite droplets	en
dc.subject.other	Solution procedure	en
dc.subject.other	Time evolutions	en
dc.subject.other	Two phase	en
dc.subject.other	Two phasis	en
dc.subject.other	Volume of Fluid Method	en
dc.subject.other	Weber numbers	en
dc.subject.other	Bridge piers	en
dc.subject.other	Coalescence	en
dc.subject.other	Drop breakup	en
dc.subject.other	Drop formation	en
dc.subject.other	Flow fields	en
dc.subject.other	Ligaments	en
dc.subject.other	Liquids	en
dc.subject.other	Navier Stokes equations	en
dc.subject.other	Plasmas	en
dc.subject.other	Satellites	en
dc.subject.other	Size separation	en
dc.subject.other	Phase interfaces	en
dc.title	Off-centre binary collision of droplets: A numerical investigation	en
heal.type	journalArticle	en
heal.identifier.primary	10.1016/j.ijheatmasstransfer.2009.04.011	en
heal.identifier.secondary	http://dx.doi.org/10.1016/j.ijheatmasstransfer.2009.04.011	en
heal.publicationDate	2009	en
heal.abstract	The paper presents results from a numerical investigation of the non-central binary collision of two equal size droplets in a gaseous phase. The flow field is two phase and three dimensional; the investigation is based on the finite volume numerical solution of the Navier-Stokes equations, coupled with the Volume of Fluid Method (VOF), expressing the unified flow field of the two phases, liquid and gas. A recently developed adaptive local grid refinement technique is used, in order to increase the accuracy of the solution particularly in the region of the liquid-gas interface. The reliability of the solution procedure is tested by comparing predictions with available experimental data. The numerical results predict the collision process of the two colliding droplets (permanent coalescence or separation) and in the case of separation the formation and the size of the satellite droplets. The time evolution of the geometrical characteristics of the ligament, for various Weber numbers and impact parameters, is calculated and details are shown of the velocity and pressure fields particularly at the ligament pinch off location not hitherto available. Gas bubbles due to collision are trapped within the liquid phase as it has also been observed in experiments and their volume is calculated. © 2009 Elsevier Ltd. All rights reserved.	en
heal.journalName	International Journal of Heat and Mass Transfer	en
dc.identifier.doi	10.1016/j.ijheatmasstransfer.2009.04.011	en
dc.identifier.volume	52	en
dc.identifier.issue	19-20	en
dc.identifier.spage	4160	en
dc.identifier.epage	4174	en