High Rayleigh number convection with gaseous helium at low temperature

被引:31
作者
Chavanne, X
Chilla, F
Chabaud, B
Castaing, B
Chaussy, J
Hebral, B
机构
[1] Centre de Recherches sur les Très Basses Températures, Laboratoire Associé à l'Université Joseph Fourier, CNRS, 38042 Grenoble-Cédex 9
[2] École Normale Supérieure de Lyon, 69364 Lyon-Cédex 7
关键词
D O I
10.1007/BF00754092
中图分类号
O59 [应用物理学];
学科分类号
摘要
This article presents an experimental set-up to study the turbulent regime of free thermal convection in a Rayleigh-Benard cell. Helium gas around 4 K is confirmed in a cell of aspect ratio 0.5. With a thermocouple technique we can measure temperature differences across the cell as low as 0.2 mK, which allows to test the adiabatic gradient effect. Covering a large range of Rayleigh numbers (10(3) to 5 x 10(12)), Nusselt numbers from 1 to 10(3) are obtained. The results are compared with previous works. They show a departure from the 2/7 power law above Ra = 3 x 10(10).
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页码:109 / 129
页数:21
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