Spreading of round dense jets impinging on a horizontal bottom

Papakonstantis, IG; Christodoulou, GC

dc.contributor.author	Papakonstantis, IG	en
dc.contributor.author	Christodoulou, GC	en
dc.date.accessioned	2014-03-01T01:34:38Z
dc.date.available	2014-03-01T01:34:38Z
dc.date.issued	2010	en
dc.identifier.issn	1570-6443	en
dc.identifier.uri	https://dspace.lib.ntua.gr/xmlui/handle/123456789/20784
dc.subject	Dense fluid discharges	en
dc.subject	Density (gravity) currents	en
dc.subject	Inclined negatively buoyant jets	en
dc.subject	Jet-boundary interaction	en
dc.subject	Radial spreading	en
dc.subject.other	Buoyant jets	en
dc.subject.other	Constant rate	en
dc.subject.other	Dense fluid	en
dc.subject.other	Densimetric Froude number	en
dc.subject.other	Density (gravity) currents	en
dc.subject.other	Density currents	en
dc.subject.other	Discharge angle	en
dc.subject.other	Drag forces	en
dc.subject.other	Jet flow	en
dc.subject.other	Jet fluid	en
dc.subject.other	Jets impinging	en
dc.subject.other	Radial distance	en
dc.subject.other	Radial spreading	en
dc.subject.other	Saltwater solution	en
dc.subject.other	Submerged nozzles	en
dc.subject.other	Drag	en
dc.subject.other	Fluids	en
dc.subject.other	Video cameras	en
dc.subject.other	Buoyancy	en
dc.subject.other	buoyancy	en
dc.subject.other	density current	en
dc.subject.other	discharge	en
dc.subject.other	drag	en
dc.subject.other	Froude number	en
dc.subject.other	jet flow	en
dc.subject.other	radial flow	en
dc.subject.other	turbulent flow	en
dc.title	Spreading of round dense jets impinging on a horizontal bottom	en
heal.type	journalArticle	en
heal.identifier.primary	10.1016/j.jher.2010.07.001	en
heal.identifier.secondary	http://dx.doi.org/10.1016/j.jher.2010.07.001	en
heal.language	English	en
heal.publicationDate	2010	en
heal.abstract	The radial spreading of density currents arising from the impingement of submerged round turbulent dense jets on a horizontal bottom is investigated. Experiments were conducted for spreading due to (i) the return on the bottom of negatively buoyant jets discharged upwards at four different angles, namely 45 degrees, 60 degrees, 75 degrees and 85 degrees to the horizontal and (ii) the impingement of positively buoyant jets discharged horizontally or vertically downwards to the bottom from a submerged nozzle. The jet fluid was colored saltwater solution issuing at a constant rate in a calm freshwater ambient and the spreading was recorded by means of a video camera. For the inclined negatively buoyant jets and the vertical positively buoyant ones the outer visual boundary of the density current is found to be almost circular. The radial distance from the impingement point to the outer boundary is estimated and found to correlate with time to a power of about 1/2, indicating a balance between buoyancy and drag forces. The radial distance is normalized by time and by the initial or local jet flow parameters and its variation with the discharge angle and the densimetric Froude number is presented. (C) 2010 International Association of Hydro-environment Engineering and Research, Asia Pacific Division. Published by Elsevier B.V. All rights reserved.	en
heal.publisher	ELSEVIER SCIENCE BV	en
heal.journalName	Journal of Hydro-Environment Research	en
dc.identifier.doi	10.1016/j.jher.2010.07.001	en
dc.identifier.isi	ISI:000286038800004	en
dc.identifier.volume	4	en
dc.identifier.issue	4	en
dc.identifier.spage	289	en
dc.identifier.epage	300	en