Heat transport in turbulent rayleigh-Benard convection
Heat transport in turbulent rayleigh-Benard convection
复制标题
湍流瑞利-贝纳德对流中的热传输
DOI：
10.1103/physrevlett.84.4357
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发表时间：
2000
影响因子：
8.6
通讯作者：
Ahlers
中科院分区：
文献类型：
--
作者：
Xu;Bajaj;Ahlers
我们在长径比为0的圆柱形细胞中测量了努塞尔数N作为瑞利数R的函数。5</=与d /d</=12.8相同（d为直径，d为高度）。我们使用普朗特数sigma = 4.0的丙酮，10(5)少，相似r少，相似4x10（10）。幂律N = N(0)R（gamma(eff)）在R的有限范围内的拟合得到gamma（eff）的值从R = 10(7)附近的0.275到R = 10（10）附近的0.300。数据与N(R)的单次幂定律不一致。对于R bbb10(7)，它们与Grossmann和Lohse提出的N = assigma -1/ 12r1 /4+bsigma-1/7R3/7一致，相似2。
We present measurements of the Nusselt number N as a function of the Rayleigh number R in cylindrical cells with aspect ratios 0. 5</=gamma identical withD/d</=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, similarR less, similar4x10(10). A fit of a power law N = N(0)R(gamma(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>10(7) they are consistent with N = asigma-1/12R1/4+bsigma-1/7R3/7 as proposed by Grossmann and Lohse for sigma greater, similar2.