Multiple transitions in rotating turbulent Rayleigh-Bénard convection.

Multiple transitions in rotating turbulent Rayleigh-Bénard convection.
复制标题

旋转湍流瑞利-贝纳德对流中的多重转变

DOI:
10.1103/physrevlett.114.114506
复制
发表时间:
2015
影响因子:
8.6
通讯作者:
G. Ahlers
G. Ahlers
中科院分区:
物理与天体物理1区
文献类型:
--
作者:
P. Wei;S. Weiss;G. Ahlers

文献摘要

参考文献

被引文献

相似文献

有时人们认为,可能不同的湍流状态之间的急剧转变应该被普遍存在的强烈波动和较短的相干长度和时间所冲淡。与这一预期相反,我们发现在旋转的瑞利-伯纳德对流中,随着旋转速度的增加,会出现一系列这样的转变。在长宽比(直径/高度)和0.50的圆柱形样品中观察到了这种现象。它在瑞利数非常大的时候变得最突出,在那里波动非常剧烈,并且在以下方面表现得最明显。它不仅存在于样品中心附近的温度梯度中,而且存在于热输运过程中。我们推测,这种转变是在涉及对称性变化的不同大尺度结构之间进行的,因此不可能是渐进的[L.Landau,ZH。Eksp.蒂尔。菲兹。7,19(1937年);L. D.Landau,Phys.Z.SowjetUnion 11,26(1937年);L. D.Landau,在L. D.Landau的文集中,(牛津大学出版社,1965年),第193-216页]。
Sometimes it is thought that sharp transitions between potentially different turbulent states should be washed out by the prevailing intense fluctuations and short coherence lengths and times. Contrary to this expectation, we found asequenceof such transitions in turbulent rotating Rayleigh-Bénard convection as the rotation rate was increased. This phenomenon was observed in cylindrical samples with aspect ratios (diameter/height)and 0.50. It became most prominent at very large Rayleigh numbers up to, where the fluctuations are extremely vigorous, and was manifested most clearly for. It was found in the heat transport as well as in the temperature gradient near the sample center. We conjecture that the transitions are between different large-scale structures which involve changes of symmetry and thus cannot be gradual [L. Landau, Zh. Eksp. Teor. Fiz. 7, 19 (1937); L. D. Landau, Phys. Z. Sowjetunion 11, 26 (1937); L. D. Landau, in Collected Papers of L. D. Landau, (Oxford University Press, Oxford, 1965), pp. 193–216].
36
DOI: 10.1097/01.ccm.0000550828.76036.ba
发表时间: 2012
期刊: The Hatak Witches
影响因子: --
作者:
Carter Ratcliff
通讯作者: Carter Ratcliff