Zobrazeno 1 - 10
of 283
pro vyhledávání: '"Guenter Ahlers"'
Publikováno v:
Theoretical and Applied Mechanics Letters, Vol 11, Iss 2, Pp 100237- (2021)
We propose a theoretical model for spatial variations of the temperature variance σ2(z,r) (z is the distance from the sample bottom and r the radial coordinate) in turbulent Rayleigh-Bénard convection (RBC). Adapting the “attached-eddy” model o
Externí odkaz:
https://doaj.org/article/6ec0e9c5250b479592520cc8d203dfa0
Publikováno v:
New Journal of Physics, Vol 17, Iss 6, p 063028 (2015)
We report results of Reynolds-number measurements, based on multi-point temperature measurements and the elliptic approximation (EA) of He and Zhang (2006 Phys. Rev. E http://dx.doi.org/10.1103/PhysRevE.73.055303 73 http://dx.doi.org/10.1103/PhysRevE
Externí odkaz:
https://doaj.org/article/e08bdc47af264f47b297b8c0cd26ab4d
Publikováno v:
New Journal of Physics, Vol 14, Iss 10, p 103012 (2012)
We report on the experimental results for heat-transport measurements, in the form of the Nusselt number Nu , by turbulent Rayleigh–Bénard convection (RBC) in a cylindrical sample of aspect ratio Γ ≡ D / L = 0.50 ( D = 1.12 m is the diameter an
Externí odkaz:
https://doaj.org/article/bdeaa88762014cc3bef597c6bc84e571
Autor:
Guenter Ahlers, Eberhard Bodenschatz, Robert Hartmann, Xiaozhou He, Detlef Lohse, Philipp Reiter, Richard J. A. M. Stevens, Roberto Verzicco, Marcel Wedi, Stephan Weiss, Xuan Zhang, Lukas Zwirner, Olga Shishkina
Publikováno v:
Physical review letters, 128(8):084501. American Physical Society
While the heat transfer and the flow dynamics in a cylindrical Rayleigh-Bénard (RB) cell are rather independent of the aspect ratio Γ (diameter/height) for large Γ, a small-Γ cell considerably stabilizes the flow and thus affects the heat transfe
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::7bea579728ad65110da7289cac570153
https://hdl.handle.net/2108/315674
https://hdl.handle.net/2108/315674
Publikováno v:
Journal of Fluid Mechanics. 931
We report measurements of the temperature frequency spectra $P(\,f, z, r)$ , the variance $\sigma ^2(z,r)$ and the Nusselt number $Nu$ in turbulent Rayleigh–Bénard convection (RBC) over the Rayleigh number range $4\times 10^{11} \underset{\smash{\
Publikováno v:
Theoretical and Applied Mechanics Letters, Vol 11, Iss 2, Pp 100237-(2021)
We propose a theoretical model for spatial variations of the temperature variance σ 2 ( z , r ) (z is the distance from the sample bottom and r the radial coordinate) in turbulent Rayleigh-Benard convection (RBC). Adapting the “attached-eddy” mo
Thermal convection is of major importance in various astro- and geophysical systems, exemplary are buoyancy driven flows in the atmosphere or in the stellar interior. It has been studied for decades in an idealized model system - the Rayleigh-Bénar
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::3b11cfacb372207f45cc0b6f48859843
https://doi.org/10.5194/egusphere-egu2020-9511
https://doi.org/10.5194/egusphere-egu2020-9511
Autor:
Eberhard Bodenschatz, Guenter Ahlers, Robert E. Ecke, Susanne Horn, Marcel Wedi, Dennis P. M. van Gils, Lukas Zwirner, Stephan Weiss, Xuan Zhang, Olga Shishkina
Publikováno v:
Physical review letters, 124(8):084505. American Physical Society
For rapidly rotating turbulent Rayleigh--B\'enard convection in a slender cylindrical cell, experiments and direct numerical simulations reveal a boundary zonal flow (BZF) that replaces the classical large-scale circulation. The BZF is located near t
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::32d7b059d39d0930e5975540aaee4d15
https://research.utwente.nl/en/publications/763a5d25-65a7-41ba-9909-462279a582a6
https://research.utwente.nl/en/publications/763a5d25-65a7-41ba-9909-462279a582a6
Publikováno v:
Physical review letters. 124(22)
Publikováno v:
Journal of Fluid Mechanics. 851:374-390
We critically analyse the different ways to evaluate the dependence of the Nusselt number ($\mathit{Nu}$) on the Rayleigh number ($\mathit{Ra}$) in measurements of the heat transport in turbulent Rayleigh–Bénard convection under general non-Oberbe