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Experimental study of high Rayleigh number convection using cryogenic gaseous 4He
Turbulent thermal convection was studied using cryogenic He gas. In order to resolve controversies among published results of Nusselt versus Rayleifh numbers at very high Rayleigh numbers a cryogenic apparatus was designed ...
BK - Mechanika tekutin
- 2010 •
- D
Rok uplatnění
D - Stať ve sborníku
Has the ultimate state of turbulent thermal convection been observed?
of the Nusselt number with the Rayleigh number in the so-called ultimate state, corresponding to asymptotically high Rayleigh numbers. A related but separate question is whether varies as the square root ...
BK - Mechanika tekutin
- 2015 •
- Jx •
- Link
Rok uplatnění
Jx - Nezařazeno - Článek v odborném periodiku (Jimp, Jsc a Jost)
Výsledek na webu
Detection of coherent structures and determination of mean wind velocity in turbulent Rayleigh-Bénard convection
First results of coherent structures studies in Rayleigh-Bénard convection are presented for high Rayleigh numbers in cryogenic helium gas.These results enable to determine the velocity and direction of macroscopic flow, so...
BK - Mechanika tekutin
- 2012 •
- D
Rok uplatnění
D - Stať ve sborníku
Resolution tests of three-dimensional convection models by traveltime tomography: effects of Rayleigh number and regular versus irregular
Resolution tests of three-dimensional convection models by traveltime tomography: effects of Rayleigh number and regular versus irregular......
DE - Zemský magnetismus, geodesie, geografie
- 2007 •
- Jx
Rok uplatnění
Jx - Nezařazeno - Článek v odborném periodiku (Jimp, Jsc a Jost)
Heat transfer in cryogenic helium gas by turbulent Rayleigh-Bénard convection in a cylindrical cell of aspect 1
described by the Nusselt number Nu = Nu(Ra, Pr) is investigated for the range of Rayleigh number 10**6 < Ra < 10**15. with the Prandtl number varying such that 0.7 < RaWe present experimental results on the heat t...
BK - Mechanika tekutin
- 2014 •
- Jx
Rok uplatnění
Jx - Nezařazeno - Článek v odborném periodiku (Jimp, Jsc a Jost)
Efficiency of Heat Transfer in Turbulent Rayleigh-Benard Convection
Rayleigh number (Ra) scaling.We present an experimental study of turbulent Rayleigh-Benard convection (RBC) in a cylindrical cell of height 0.3 m, diameter 0.3 m. It is designed to minimize the influence of its structure o...
BJ - Termodynamika
- 2011 •
- Jx •
- Link
Rok uplatnění
Jx - Nezařazeno - Článek v odborném periodiku (Jimp, Jsc a Jost)
Výsledek na webu
Effect of Boundary Layers Asymmetry on Heat Transfer Efficiency in Turbulent Rayleigh-Bernard Convection at Very High Rayleigh Numbers
The heat transfer efficiency in turbulent Rayleigh-Benard convection is investigated experimentally, in a cylindrical cell of height 0.3 m, diameter 0.3 m. We show that for Rayleigh numbers 10(12) less than or similar to Ra...
BK - Mechanika tekutin
- 2012 •
- Jx •
- Link
Rok uplatnění
Jx - Nezařazeno - Článek v odborném periodiku (Jimp, Jsc a Jost)
Výsledek na webu
Ultra-high Rayleigh number convection in cryogenic helium gas
Normalized heat transfer and temperature power spectra of turbulent Rayleigh-Benard convection in cryogenic helium gas are studied over an unprecedented range of Rayleigh number (Ra) from 106 up to 2x1015, the highest Ra ev...
BK - Mechanika tekutin
- 2000 •
- Jx
Rok uplatnění
Jx - Nezařazeno - Článek v odborném periodiku (Jimp, Jsc a Jost)
Convection in rotating non-uniformly stratified spherical fluid shells in dependence on Ekman and Prandtl numbers
spherical shells in dependence on Prandtl, Ekman and Rayleigh numbers. Attention evident at small values of Rayleigh numbers (large values of Ekman numbers), at large Rayleigh numbers is...
DE - Zemský magnetismus, geodesie, geografie
- 2010 •
- Jx
Rok uplatnění
Jx - Nezařazeno - Článek v odborném periodiku (Jimp, Jsc a Jost)
Rayleigh Scattering by Helium in Stellar Atmospheres
of helium in stars with solar composition (about 10% by number) and lower RayleighWe study the influence of Rayleigh scattering by helium on synthetic spectra and stellar atmosphere models. Rayleigh scattering by ...
Astronomy (including astrophysics,space science)
- 2017 •
- D
Rok uplatnění
D - Stať ve sborníku
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