Experimental study of high-Rayleigh-number convection in mercury and water

被引：56

作者：

Cioni, S

Ciliberto, S

Sommeria, J

机构：

来源：

DYNAMICS OF ATMOSPHERES AND OCEANS | 1996年 / 24卷 / 1-4期

关键词：

D O I：

10.1016/0377-0265(95)00453-X

中图分类号：

P3 [地球物理学]; P59 [地球化学];

学科分类号：

0708 ; 070902 ;

摘要：

Experimental results of Rayleigh-Benard convection in the strongly turbulent regime are presented. The liquids tested are water (Pr approximate to 7) and mercury (Pr = 0.025), covering a range of Rayleigh numbers 4.6 x 10(6) < Ra < 6.3 x 10(9). The convective chamber consists of a cylindrical cell of aspect ratio Gamma = 1 (Gamma = diameter/depth). The heat flux, the temperature fluctuation spectra and the structure of the mean flow have been measured. For Ra > 2 x 10(9) a transition to a new turbulent regime was observed with considerable increase of the Nusselt number. A decrease in Nusselt number with decreasing Prandtl number is observed at given Ra.

引用

页码：117 / 127

页数：11

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