The effect of gas and liquid properties and droplet size ratio on the central collision between two unequal-size droplets in the reflexive regime

Nikolopoulos, N; Bergeles, G

dc.contributor.author	Nikolopoulos, N	en
dc.contributor.author	Bergeles, G	en
dc.date.accessioned	2014-03-01T01:37:18Z
dc.date.available	2014-03-01T01:37:18Z
dc.date.issued	2011	en
dc.identifier.issn	0017-9310	en
dc.identifier.uri	https://dspace.lib.ntua.gr/xmlui/handle/123456789/21492
dc.subject	Binary collision	en
dc.subject	Satellite droplets	en
dc.subject	Unequal sized droplets	en
dc.subject.classification	Thermodynamics	en
dc.subject.classification	Engineering, Mechanical	en
dc.subject.classification	Mechanics	en
dc.subject.other	Binary collisions	en
dc.subject.other	Collision process	en
dc.subject.other	Computational costs	en
dc.subject.other	Controlling parameters	en
dc.subject.other	Deformed shape	en
dc.subject.other	Droplet sizes	en
dc.subject.other	Experimental data	en
dc.subject.other	Finite volume	en
dc.subject.other	Gas phase properties	en
dc.subject.other	Gas properties	en
dc.subject.other	Gaseous environments	en
dc.subject.other	Liquid gas interface	en
dc.subject.other	Liquid properties	en
dc.subject.other	Local grid refinement	en
dc.subject.other	Mixing process	en
dc.subject.other	Numerical investigations	en
dc.subject.other	Numerical solution	en
dc.subject.other	Satellite droplets	en
dc.subject.other	Size droplets	en
dc.subject.other	Time evolutions	en
dc.subject.other	Unequal sized droplets	en
dc.subject.other	Volume of fluid method	en
dc.subject.other	Drop breakup	en
dc.subject.other	Drop formation	en
dc.subject.other	Gases	en
dc.subject.other	Liquids	en
dc.subject.other	Navier Stokes equations	en
dc.subject.other	Reynolds number	en
dc.subject.other	Phase interfaces	en
dc.title	The effect of gas and liquid properties and droplet size ratio on the central collision between two unequal-size droplets in the reflexive regime	en
heal.type	journalArticle	en
heal.identifier.primary	10.1016/j.ijheatmasstransfer.2010.09.002	en
heal.identifier.secondary	http://dx.doi.org/10.1016/j.ijheatmasstransfer.2010.09.002	en
heal.language	English	en
heal.publicationDate	2011	en
heal.abstract	A numerical investigation of various parameters affecting the collision process of two unequal sized droplets in a gaseous environment in the reflexive regime is presented. The investigation is based on the finite volume numerical solution of the Navier-Stokes equations, in their axial-symmetric formulation, expressing the flow field of the two phases, liquid and gas, coupled with the volume of fluid method (VOF) for tracking the liquid-gas interfaces; a recently developed adaptive local grid refinement technique is used in order to track more accurately the liquid-gas interface with reduced computational cost. A colour function is used in order to follow the mixing process of the two droplets after collision. The reliability of the procedure is first established by comparing predictions with available experimental data and important details as regards the time evolution of the deformed shapes, the ligament formation, the maximum deformation of the droplets and the penetration of one droplet into the other are presented. The collision process and its outcome are investigated having the liquid properties (Ohnesorge number based on the liquid properties), the gas phase properties (Reynolds number based on gas properties) and droplet size ratio as the controlling parameters. (C) 2010 Elsevier Ltd. All rights reserved.	en
heal.publisher	PERGAMON-ELSEVIER SCIENCE LTD	en
heal.journalName	International Journal of Heat and Mass Transfer	en
dc.identifier.doi	10.1016/j.ijheatmasstransfer.2010.09.002	en
dc.identifier.isi	ISI:000285116500071	en
dc.identifier.volume	54	en
dc.identifier.issue	1-3	en
dc.identifier.spage	678	en
dc.identifier.epage	691	en