Transitions in heat transport by turbulent convection at Rayleigh numbers up to 1015
Identifieur interne : 000F23 ( Main/Curation ); précédent : 000F22; suivant : 000F24Transitions in heat transport by turbulent convection at Rayleigh numbers up to 1015
Auteurs : Guenter Ahlers [États-Unis] ; Denis Funfschilling [France] ; Eberhard Bodenschatz [Allemagne, États-Unis]Source :
- New Journal of Physics [ 1367-2630 ] ; 2009.
English descriptors
- KwdEn :
- Ahlers, Aluminum plates, Aspect ratio, Azimuthal direction, Bottom plate, Bottom plates, Bottom section, Bottom shield, Bottom support plate, Bottom surface, Boundary conditions, Changes discontinuously, Classical gases, Convection, Convection cell, Convection facility, Convection phys, Copper plates, Critical point, Critical point phys, Cryogenic helium, Cylindrical sample, Data sets, Effective exponent, Entire length, Exponent, Fluid mech, Further change, Grenoble data, Groove, Gure, Heat capacity, Heat transport, Hpcf, Important issue, Inner diameter, Kraichnan, Large values, Lett, Lexan plate, Logarithmic scale, Logarithmic scales, Maximum pressure, More detail, Nite, Nite conductivity, Nusselt, Nusselt number, Open symbols, Oregon data, Other hand, Phys, Planck institute, Plate correction, Plexiglas side wall, Power supply, Prandtl, Prandtl number, Present work, Pressure vessel, Pure gases, Purple stars, Radial ramp, Rayleigh, Rayleigh number, Rayleigh numbers, Reynolds number, Sample cell, Schematic diagram, Second transition, Sharp transition, Side shield, Side wall, Single convection roll, Small values, Solid line, Solid symbols, Support plate, Support ring, Tbpb tbpt, Temperature difference, Thermal conductivity, Turbulent, Turbulent convection, Turbulent convection phys, Turbulent rayleigh, Turbulent state, Turbulent states, Uboot, Ultimate state, Various gases, Wall thickness, Wide range.
- Teeft :
- Ahlers, Aluminum plates, Aspect ratio, Azimuthal direction, Bottom plate, Bottom plates, Bottom section, Bottom shield, Bottom support plate, Bottom surface, Boundary conditions, Changes discontinuously, Classical gases, Convection, Convection cell, Convection facility, Convection phys, Copper plates, Critical point, Critical point phys, Cryogenic helium, Cylindrical sample, Data sets, Effective exponent, Entire length, Exponent, Fluid mech, Further change, Grenoble data, Groove, Gure, Heat capacity, Heat transport, Hpcf, Important issue, Inner diameter, Kraichnan, Large values, Lett, Lexan plate, Logarithmic scale, Logarithmic scales, Maximum pressure, More detail, Nite, Nite conductivity, Nusselt, Nusselt number, Open symbols, Oregon data, Other hand, Phys, Planck institute, Plate correction, Plexiglas side wall, Power supply, Prandtl, Prandtl number, Present work, Pressure vessel, Pure gases, Purple stars, Radial ramp, Rayleigh, Rayleigh number, Rayleigh numbers, Reynolds number, Sample cell, Schematic diagram, Second transition, Sharp transition, Side shield, Side wall, Single convection roll, Small values, Solid line, Solid symbols, Support plate, Support ring, Tbpb tbpt, Temperature difference, Thermal conductivity, Turbulent, Turbulent convection, Turbulent convection phys, Turbulent rayleigh, Turbulent state, Turbulent states, Uboot, Ultimate state, Various gases, Wall thickness, Wide range.
Abstract
We describe a pressure vessel for conducting experiments in helium (He), air, nitrogen (N2) or sulfur hexafluoride (SF6) under pressures of up to 19bars, and facilities for the study of RayleighBnard convection inside this pressure vessel. The convection cells, known as the high pressure convection facilities (HPCFs), can have interior heights up to L2.3m and diameters up to D1.2m.Measurements of the Nusselt number Nu for Rayleigh numbers Ra up to Ra41013 and a Prandtl number Pr0.8 gave NuRaeff with eff0.308. At Ra there was a sharp transition to a new regime. The Nusselt number was continuous at Ra, but the exponent characterizing its dependence on Ra changed suddenly to eff0.25. Near RaRa31014, there was a further change in the Ra-dependence of Nu. A new state with eff0.17 evolved and there was bistability of the eff0.25 and the eff0.17 branches.
Url:
DOI: 10.1088/1367-2630/11/12/123001
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<profileDesc><textClass><keywords scheme="KwdEn" xml:lang="en"><term>Ahlers</term>
<term>Aluminum plates</term>
<term>Aspect ratio</term>
<term>Azimuthal direction</term>
<term>Bottom plate</term>
<term>Bottom plates</term>
<term>Bottom section</term>
<term>Bottom shield</term>
<term>Bottom support plate</term>
<term>Bottom surface</term>
<term>Boundary conditions</term>
<term>Changes discontinuously</term>
<term>Classical gases</term>
<term>Convection</term>
<term>Convection cell</term>
<term>Convection facility</term>
<term>Convection phys</term>
<term>Copper plates</term>
<term>Critical point</term>
<term>Critical point phys</term>
<term>Cryogenic helium</term>
<term>Cylindrical sample</term>
<term>Data sets</term>
<term>Effective exponent</term>
<term>Entire length</term>
<term>Exponent</term>
<term>Fluid mech</term>
<term>Further change</term>
<term>Grenoble data</term>
<term>Groove</term>
<term>Gure</term>
<term>Heat capacity</term>
<term>Heat transport</term>
<term>Hpcf</term>
<term>Important issue</term>
<term>Inner diameter</term>
<term>Kraichnan</term>
<term>Large values</term>
<term>Lett</term>
<term>Lexan plate</term>
<term>Logarithmic scale</term>
<term>Logarithmic scales</term>
<term>Maximum pressure</term>
<term>More detail</term>
<term>Nite</term>
<term>Nite conductivity</term>
<term>Nusselt</term>
<term>Nusselt number</term>
<term>Open symbols</term>
<term>Oregon data</term>
<term>Other hand</term>
<term>Phys</term>
<term>Planck institute</term>
<term>Plate correction</term>
<term>Plexiglas side wall</term>
<term>Power supply</term>
<term>Prandtl</term>
<term>Prandtl number</term>
<term>Present work</term>
<term>Pressure vessel</term>
<term>Pure gases</term>
<term>Purple stars</term>
<term>Radial ramp</term>
<term>Rayleigh</term>
<term>Rayleigh number</term>
<term>Rayleigh numbers</term>
<term>Reynolds number</term>
<term>Sample cell</term>
<term>Schematic diagram</term>
<term>Second transition</term>
<term>Sharp transition</term>
<term>Side shield</term>
<term>Side wall</term>
<term>Single convection roll</term>
<term>Small values</term>
<term>Solid line</term>
<term>Solid symbols</term>
<term>Support plate</term>
<term>Support ring</term>
<term>Tbpb tbpt</term>
<term>Temperature difference</term>
<term>Thermal conductivity</term>
<term>Turbulent</term>
<term>Turbulent convection</term>
<term>Turbulent convection phys</term>
<term>Turbulent rayleigh</term>
<term>Turbulent state</term>
<term>Turbulent states</term>
<term>Uboot</term>
<term>Ultimate state</term>
<term>Various gases</term>
<term>Wall thickness</term>
<term>Wide range</term>
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<keywords scheme="Teeft" xml:lang="en"><term>Ahlers</term>
<term>Aluminum plates</term>
<term>Aspect ratio</term>
<term>Azimuthal direction</term>
<term>Bottom plate</term>
<term>Bottom plates</term>
<term>Bottom section</term>
<term>Bottom shield</term>
<term>Bottom support plate</term>
<term>Bottom surface</term>
<term>Boundary conditions</term>
<term>Changes discontinuously</term>
<term>Classical gases</term>
<term>Convection</term>
<term>Convection cell</term>
<term>Convection facility</term>
<term>Convection phys</term>
<term>Copper plates</term>
<term>Critical point</term>
<term>Critical point phys</term>
<term>Cryogenic helium</term>
<term>Cylindrical sample</term>
<term>Data sets</term>
<term>Effective exponent</term>
<term>Entire length</term>
<term>Exponent</term>
<term>Fluid mech</term>
<term>Further change</term>
<term>Grenoble data</term>
<term>Groove</term>
<term>Gure</term>
<term>Heat capacity</term>
<term>Heat transport</term>
<term>Hpcf</term>
<term>Important issue</term>
<term>Inner diameter</term>
<term>Kraichnan</term>
<term>Large values</term>
<term>Lett</term>
<term>Lexan plate</term>
<term>Logarithmic scale</term>
<term>Logarithmic scales</term>
<term>Maximum pressure</term>
<term>More detail</term>
<term>Nite</term>
<term>Nite conductivity</term>
<term>Nusselt</term>
<term>Nusselt number</term>
<term>Open symbols</term>
<term>Oregon data</term>
<term>Other hand</term>
<term>Phys</term>
<term>Planck institute</term>
<term>Plate correction</term>
<term>Plexiglas side wall</term>
<term>Power supply</term>
<term>Prandtl</term>
<term>Prandtl number</term>
<term>Present work</term>
<term>Pressure vessel</term>
<term>Pure gases</term>
<term>Purple stars</term>
<term>Radial ramp</term>
<term>Rayleigh</term>
<term>Rayleigh number</term>
<term>Rayleigh numbers</term>
<term>Reynolds number</term>
<term>Sample cell</term>
<term>Schematic diagram</term>
<term>Second transition</term>
<term>Sharp transition</term>
<term>Side shield</term>
<term>Side wall</term>
<term>Single convection roll</term>
<term>Small values</term>
<term>Solid line</term>
<term>Solid symbols</term>
<term>Support plate</term>
<term>Support ring</term>
<term>Tbpb tbpt</term>
<term>Temperature difference</term>
<term>Thermal conductivity</term>
<term>Turbulent</term>
<term>Turbulent convection</term>
<term>Turbulent convection phys</term>
<term>Turbulent rayleigh</term>
<term>Turbulent state</term>
<term>Turbulent states</term>
<term>Uboot</term>
<term>Ultimate state</term>
<term>Various gases</term>
<term>Wall thickness</term>
<term>Wide range</term>
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<front><div type="abstract">We describe a pressure vessel for conducting experiments in helium (He), air, nitrogen (N2) or sulfur hexafluoride (SF6) under pressures of up to 19bars, and facilities for the study of RayleighBnard convection inside this pressure vessel. The convection cells, known as the high pressure convection facilities (HPCFs), can have interior heights up to L2.3m and diameters up to D1.2m.Measurements of the Nusselt number Nu for Rayleigh numbers Ra up to Ra41013 and a Prandtl number Pr0.8 gave NuRaeff with eff0.308. At Ra there was a sharp transition to a new regime. The Nusselt number was continuous at Ra, but the exponent characterizing its dependence on Ra changed suddenly to eff0.25. Near RaRa31014, there was a further change in the Ra-dependence of Nu. A new state with eff0.17 evolved and there was bistability of the eff0.25 and the eff0.17 branches.</div>
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