Spatial Scaling of Large-Scale Circulations and Heat Transport in Turbulent Mixed Convection

Westhoff, Andreas

dc.contributor.advisor	Dillmann, Andreas Prof. Dr. Dr.	de
dc.contributor.author	Westhoff, Andreas	de
dc.date.accessioned	2013-02-18T09:57:43Z	de
dc.date.available	2013-02-18T09:57:43Z	de
dc.date.issued	2013-02-18	de
dc.identifier.uri	http://hdl.handle.net/11858/00-1735-0000-000D-FD19-2	de
dc.identifier.uri	http://dx.doi.org/10.53846/goediss-3733
dc.identifier.uri	http://dx.doi.org/10.53846/goediss-3733
dc.language.iso	eng	de
dc.publisher	Niedersächsische Staats- und Universitätsbibliothek Göttingen	de
dc.rights.uri	http://creativecommons.org/licenses/by-nc-nd/3.0/
dc.subject.ddc	530	de
dc.title	Spatial Scaling of Large-Scale Circulations and Heat Transport in Turbulent Mixed Convection	de
dc.type	doctoralThesis	de
dc.contributor.referee	Dillmann, Andreas Prof. Dr.	de
dc.date.examination	2012-11-14	de
dc.subject.gok	Physik (PPN621336750)	de
dc.description.abstracteng	The present study reports an experimental investigation of the scaling of large-scale coherent structures, their dynamics and heat transport in turbulent mixed convection. Based on a concept of spatial scaling, mixed convective air flow was examined by particle image velocimetry and temperature measurements in two rectangular containers with the same geometry and similar characteristic numbers. The dimensions of the container are scaled by a factor five. Due to the unsteady nature of mixed convection in the present configuration and parameter range, the instantaneous velocity vector fields are subjected to a proper orthogonal decomposition and a vortex detecting algorithm in order to identify the predominant coherent structures and their dynamics. It was found that mixed convection is far from equilibrium and comprises numerous of flow states; depending on the ratio of inertia to buoyancy forces. In addition, the study reveals a strong correlation between the dynamics of the large-scale coherent structures and the transport of heat. Based on these characteristic features, mixed convection was examined for similitude of the predominant coherent structures and for kinematic similitude. A good accordance of the topology of the large-scale structures and their dynamics was found.	de
dc.contributor.coReferee	Tilgner, Andreas Prof. Dr.	de
dc.subject.eng	mixed convection	de
dc.subject.eng	scaling	de
dc.subject.eng	coherent structures	de
dc.subject.eng	heat transfer	de
dc.subject.eng	low frequency dynamics	de
dc.subject.eng	particle image velocimetry	de
dc.subject.eng	proper orthogonal decomposition	de
dc.identifier.urn	urn:nbn:de:gbv:7-11858/00-1735-0000-000D-FD19-2-4	de
dc.affiliation.institute	Fakultät für Physik	de
dc.identifier.ppn	737347104	de

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