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Experimental study of high rayleigh number convection using cryogenic gaseous 4He
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SYSNO ASEP 0352309 Document Type C - Proceedings Paper (int. conf.) R&D Document Type Conference Paper Title Experimental study of high rayleigh number convection using cryogenic gaseous 4He Author(s) Urban, Pavel (UPT-D) RID, ORCID, SAI
Musilová, Věra (UPT-D) RID, SAI, ORCID
Skrbek, L. (CZ)Number of authors 3 Source Title Proceedings of the International Conference Experimental Fluid Mechanics 2010. - Liberec : Technical University of Liberec, 2010 / Vít T. ; Dančová P. - ISBN 978-80-7372-670-6 Pages s. 762-769 Number of pages 8 s. Action Experimental Fluid Mechanics 2010 -EFM10 Event date 24.11.2010-26.11.2010 VEvent location Liberec Country CZ - Czech Republic Event type WRD Language eng - English Country CZ - Czech Republic Keywords Rayleigh number ; turbulent thermal convection ; Kraichnan regime ; convection Subject RIV BJ - Thermodynamics R&D Projects KJB200650902 GA AV ČR - Academy of Sciences of the Czech Republic (AV ČR) GA202/05/0218 GA ČR - Czech Science Foundation (CSF) ED0017/01/01 GA MŠMT - Ministry of Education, Youth and Sports (MEYS) CEZ AV0Z20650511 - UPT-D (2005-2011) Annotation Several laboratories worldwide try to elucidate the underlying mechanisms of turbulent thermal convection using cryogenic He gas, a working fluid with truly remarkable and widely tuneable properties. The focus is on the efficiency of the heat transfer, experimentally studied via the Nusselt (Nu) versus Rayleigh number (Ra) dependence, especially at very high Ra. In order to resolve existing controversies among published results, we designed and built a cryogenic apparatus capable of reaching Ra up to 2 × 10e15, thus covering the range of interest where various transitions such as that into the theoretically predicted ultimate Kraichnan regime have been claimed. The cylindrical convection cell of 300 mm both in diameter and height is designed to withstand pressures up to 250 kPa at working temperatures between 4.2 K and 12 K. The main advantage of this apparatus is minimized influence of its cell design and materials used on the studied convection. The first experimental results are resented. Workplace Institute of Scientific Instruments Contact Martina Šillerová, sillerova@ISIBrno.Cz, Tel.: 541 514 178 Year of Publishing 2011
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