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Spreading of round dense jets impinging on a horizontal bottom

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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


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