Plume motion and large-scale circulation in a cylindrical Rayleigh-Benard cell

被引：147

作者：

Funfschilling, D ^{[1
]}

Ahlers, G

机构：

[1] Univ Calif Santa Barbara, Dept Phys, Santa Barbara, CA 93106 USA

[2] Univ Calif Santa Barbara, iQUEST, Santa Barbara, CA 93106 USA

来源：

PHYSICAL REVIEW LETTERS | 2004年 / 92卷 / 19期

关键词：

D O I：

10.1103/PhysRevLett.92.194502

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

We used the time correlation of shadowgraph images to determine the angle Theta of the horizontal component of the plume velocity above ( below) the center of the bottom ( top) plate of a cylindrical Rayleigh-Benard cell of aspect ratio Gamma equivalent to D/L = 1 (D is the diameter and L similar or equal to 87 mm is the height) in the Rayleigh-number range 7 x 10(7) less than or equal to R less than or equal to 3 x 10(9) for a Prandtl number sigma = 6. We expect that Theta gives the direction of the large-scale circulation. It oscillates time periodically. Near the top and bottom plates Theta(t) has the same frequency but is anticorrelated.

引用

页码：194502 / 1

页数：4

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