Heat transport in turbulent Rayleigh-Benard convection

被引:84
作者
Xu, XC [1 ]
Bajaj, KMS
Ahlers, G
机构
[1] Univ Calif Santa Barbara, Dept Phys, Santa Barbara, CA 93106 USA
[2] Univ Calif Santa Barbara, Quantum Inst, Santa Barbara, CA 93106 USA
关键词
D O I
10.1103/PhysRevLett.84.4357
中图分类号
O4 [物理学];
学科分类号
0702 ;
摘要
We present measurements of the Nusselt number N as a function of the Rayleigh number R in cylindrical cells with aspect ratios 0.5 less than or equal to Gamma = D/d less than or equal to 12.8 (D is the diameter and d is the height). We used acetone with a Prandtl number sigma = 4.0 for 10(5) less than or similar to R less than or similar to 4 x 10(10) A fit of a power law N = N0Rgamma eff over limited ranges of R yielded values of gamma eff from 0.275 near R = 10(7) to 0.300 near R = 10(10) The data are inconsistent with a single power law for N(R). For R > 107 they are consistent with N = a sigma(-1/12)R(1/4) + b sigma(-1/7)R(3/7) as proposed by Grossmann and Lohse for a sigma greater than or similar to 2.
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收藏
页码:4357 / 4360
页数:4
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