Rayleigh-Bénard convection with an inclined upper boundary.
Rayleigh-Bénard convection with an inclined upper boundary.
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DOI：
10.1103/physreve.65.056301
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发表时间：
2002-04
期刊：
影响因子：
--
通讯作者：
A. Namiki;K. Kurita
中科院分区：
文献类型：
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作者：
A. Namiki;K. Kurita
我们报告的实验热驱动对流的高普朗特数流体与倾斜的上边界。对于一个倾斜的角度大于临界值，我们观察到一些新的对流模式，其中横向迁移的对流单体和羽流同时出现，并诱导从倾斜的上边界的大规模流动。从倾斜的上边界诱导的羽流激活的温度波动，导致形成一个大规模的横向尺度大于每个对流单体的水平传热。通过比较两个长度尺度来确定细胞侧向迁移开始的临界角：由倾斜的上边界和粘性边界层的厚度施加的一个对流细胞中的高度差。
We report experiments on thermally driven convection of a high-Prandtl-number fluid with an inclined upper boundary. For an inclined angle greater than the critical value, we observed a few new convection patterns, in which laterally migrating convection cells and plumes appear simultaneously and a large-scale flow is induced from the inclined upper boundary. The plumes induced from the inclined upper boundary activate the temperature fluctuations, resulting in the formation of a large-scale horizontal heat transfer with a lateral scale larger than that of each convection cell. The critical angle for the onset of the lateral migration of the cells is determined by comparing the two length scales: the height difference in one convection cell imposed by the inclined upper boundary and the thickness of the viscous boundary layer.