| dc.contributor.advisor | Nobach, Holger Dr. | |
| dc.contributor.author | Winkel, Florian | |
| dc.date.accessioned | 2015-11-27T09:56:43Z | |
| dc.date.available | 2015-11-27T09:56:43Z | |
| dc.date.issued | 2015-11-27 | |
| dc.identifier.uri | http://hdl.handle.net/11858/00-1735-0000-0028-8645-2 | |
| dc.identifier.uri | http://dx.doi.org/10.53846/goediss-5396 | |
| dc.language.iso | eng | de |
| dc.rights.uri | http://creativecommons.org/licenses/by-nc-nd/4.0/ | |
| dc.subject.ddc | 571.4 | de |
| dc.title | On Turbulent Rayleigh-Bénard Convection in a Two-Phase Binary Gas Mixture | de |
| dc.type | doctoralThesis | de |
| dc.contributor.referee | Nobach, Holger Dr. | |
| dc.date.examination | 2014-10-27 | |
| dc.description.abstracteng | In this thesis an attempt is made to generate cloud patterns in a laboratory scale experiment. A two-phase binary gas mixture is employed as a physical model system. The fluid mixture is composed of a condensable gas which forms a liquid and a vapor phase and a noncondensable gas which serves as a background or carrier gas. The fluid mixture is confined between a bottom and a top plate. If the fluid mixture is exposed to a constant temperature difference, two intriguing phenomena can be observed.
First a film condensation sets in at the cold top plate that results in the formation of a very regular hexagonal droplet pattern. The temporal evolution of the droplet pattern is quantified and it is shown that a stable mass flux is essential in order to the maintain the hexagonal symmetry of the droplet patten. Second cloud-like patterns occur in a thin layer above the liquid-vapor interface. The dynamics of the cloud-like patterns reveal the turbulent flow inside the gaseous phase. An area-perimeter analysis of the cloud-like patterns results in a fractal dimension that is similar to the one obtained by the fractal analysis of two-dimensional cloud and rain areas in satellite and radar data.
This thesis is meant as a proof of concept which is why most of the results are still qualitative. However, a physical model system is presented that is appropriate in order to study the dynamics of cloud-like patterns in a turbulent Rayleigh-Bénard convection experiment. The origin of the cloud-like patterns is still a matter of debate. Therefore further experiments that could reveal the nature of these patterns must be performed. | de |
| dc.contributor.coReferee | Tilgner, Andreas Prof. Dr. | |
| dc.subject.eng | Buoyancy-driven flows | de |
| dc.subject.eng | Rayleigh-Bénard convection | de |
| dc.subject.eng | Interfacial instabilities | de |
| dc.subject.eng | Rayleigh-Taylor instability | de |
| dc.subject.eng | Gas/liquid flows | de |
| dc.subject.eng | Thermal convection | de |
| dc.identifier.urn | urn:nbn:de:gbv:7-11858/00-1735-0000-0028-8645-2-7 | |
| dc.affiliation.institute | Göttinger Graduiertenschule für Neurowissenschaften, Biophysik und molekulare Biowissenschaften (GGNB) | de |
| dc.subject.gokfull | Biologie (PPN619462639) | de |
| dc.identifier.ppn | 841076863 | |