Experiments on the inhibition of thermal convection by a magnetic field

Experiments on the inhibition of thermal convection by a magnetic field
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DOI:
10.1098/rspa.1957.0070
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发表时间:
1957-04
期刊:
Proceedings of the Royal Society of London. Series A. Mathematical and Physical Sciences
影响因子:
--
通讯作者:
Y. Nakagawa
Y. Nakagawa
中科院分区:
其他
文献类型:
--
作者:
Y. Nakagawa

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描述了从下方加热的水平汞层中磁抑制热对流的实验。这些实验中使用了一个大型 36.5 英寸回旋加速器磁体,经过修复用于水磁研究。通过使用深度为 3 至 6 厘米的汞层和强度为 500 至 8000 高斯的磁场,可以确定不稳定开始的临界瑞利数对参数 Q1 的依赖性(= σH2d2/π2ρν,其中 H 表示磁场强度,σ 表示电导率,ν 表示运动粘度系数,ρ 表示密度,d 表示层的深度),其中 Q1 变化介于40和1·6×106之间。实验充分证实了Chandrasekhar推导的理论关系式。
Experiments on the magnetic inhibition of thermal convection in horizontal layers of mercury heated from below are described. A large 36½ in. cyclotron magnet reconditioned for hydromagnetic studies was used in these experiments. By using layers of mercury of depth 3 to 6 cm and magnetic fields of strength 500 to 8000 gauss, it has been possible to determine the dependence of the critical Rayleigh number for the onset of instability on the parameter Q1 ( = σH2d2/π2ρν, where H denotes the strength of the field, σ the electrical conductivity, ν the coefficient of kinematic viscosity, ρ the density and d the depth of the layer) for Q1 varying between 40 and 1·6 × 106. The experiments fully confirm the theoretical relation derived by Chandrasekhar.