Rayleigh-Benard convection at very high Rayleigh numbers close to the 4He critical point

被引：9

作者：

Chavanne, X ^{[1
]}

Castaing, B ^{[1
]}

Chabaud, B ^{[1
]}

Chillà, F ^{[1
]}

Hébral, B ^{[1
]}

机构：

[1] Univ Grenoble 1, Ctr Rech Tres Basses Temperatures, CNRS, F-38042 Grenoble 9, France

来源：

CRYOGENICS | 1998年 / 38卷 / 12期

关键词：

heat transfer; convection; state properties; critical temperature (C); temperature sensors (D);

D O I：

10.1016/S0011-2275(98)00111-8

中图分类号：

O414.1 [热力学];

学科分类号：

摘要：

In this article we describe an experimental procedure to study Rayleigh-Benard convection with He-4 close to its critical point (tabulated as T-c = 5.1953 K in the EIT 90, P-c = 2.275 bar) as the working fluid. The convention takes place in a closed cylindrical cell (20 cm height and 10 cm inner diameter). The experimental challenge lies in accurate temperature and density measurements. To test our system and our thermometry, an independent measurement of the critical temperature is performed and we found 5.1939 K +/- 1.0 mK (EIT 90), Measurements of the Nusselt number versus the Rayleigh number, from the laminar regime (Ra similar to 10(3)) up to the highest Ra obtained in a laboratory experiment (2 x 10(14)) are reported, with Nu varying from 1 to more than 5000. (C) 1999 Elsevier Science Ltd. All rights reserved.

引用

页码：1191 / 1198

页数：8

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