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Studium přenosu tepla turbulentním prouděním v studeném héliovém plynu v experimentu s Rayleigh-Bénardovou konvekcí na ÚPT AV v Brně / Study of heat transfer by turbulent flow in cold helium gas in experiment with Rayleigh-Bernard convection at ISI CAS in Brno

The diploma thesis deals with the study of Rayleigh-Bénard convection for Rayleigh numbers in the range 1E8-1E14. The evaluated data come from an experiment with cryogenic helium in a cylindrical cell in a configuration with cell diameter D = 30 cm, height L = 30 cm and a second configuration with cell diameter D = 30 cm, height L = 15 cm. Miniature sensors recorded temperature fluctuations over time under various physical conditions and properties of helium. Using MATLAB software, the output parameters of the system (Nusselt and Reynolds numbers) and their dependence on the control parameters (Rayleigh and Prandtl numbers) were determined from the measured data. A new approach to the distribution of measured signals according to the direction of large scale circulation was used in the work, which leads to improved analysis. Reynolds numbers were evaluated using the so-called elliptic method. Furthermore, the work deals with the study of the coherent structure of the large scale circulation inside the cell.

Identiferoai:union.ndltd.org:nusl.cz/oai:invenio.nusl.cz:444294
Date January 2021
CreatorsBalko, Marek
ContributorsŠtigler, Jaroslav, Macek, Michal
PublisherVysoké učení technické v Brně. Fakulta strojního inženýrství
Source SetsCzech ETDs
LanguageCzech
Detected LanguageEnglish
Typeinfo:eu-repo/semantics/masterThesis
Rightsinfo:eu-repo/semantics/restrictedAccess

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