Effect of a vertical magnetic field on turbulent rayleigh-Benard convection
Effect of a vertical magnetic field on turbulent rayleigh-Benard convection
复制标题
垂直磁场对湍流瑞利-贝纳德对流的影响
DOI：
10.1103/physreve.62.r4520
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发表时间：
2000
期刊：
影响因子：
--
通讯作者：
Sommeria
中科院分区：
文献类型：
--
作者：
Cioni;Chaumat;Sommeria
实验研究了垂直均匀磁场对Rayleigh-Benard对流的影响。我们证实，对流的阈值是符合线性稳定性理论的约4x 10（6），比以前的实验中更高的Ekrasekhar数Q。我们表征两个对流制度的影响MHD效应。在第一种情况下，努塞尔数Nu与瑞利数Ra成正比，这可以解释为热边界层的边缘稳定性条件。对于更高的Ra，获得约Ra 0.43的第二状态Nu。
The effect of a vertical uniform magnetic field on Rayleigh-Benard convection is investigated experimentally. We confirm that the threshold of convection is in agreement with linear stability theory up to a Chandrasekhar number Q approximately 4x10(6), higher than in previous experiments. We characterize two convective regimes influenced by MHD effects. In the first one, the Nusselt number Nu proportional to the Rayleigh number Ra, which can be interpreted as a condition of marginal stability for the thermal boundary layer. For higher Ra, a second regime Nu approximately Ra0.43 is obtained.