Determination of the energy dissipation in the Geodynamo

地球发电机能量耗散的测定

• 批准号: 21244071
• 负责人: HAMANO Yozo
• 金额: $ 28.37万
• 依托单位: Japan Agency for Marine-Earth Science and Technology
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (A)
• 财政年份: 2009
• 资助国家: 日本
• 起止时间: 2009 至 2011
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-21244071/
• 关键词: 地球磁場; 地球流体核; ダイナモ作用; 磁場変動観測; 室内実験; 数値シミュレーション; 乱流; 地球ダイナモ; 液体金属; 熱対流; 数値モデリング

Laboratory experiments on the turbulent thermal convection of a liquid metal under ambient magnetic fields with various intensities were carried out. Consulting with the observed variations of the geomagnetic field and the results of geodynamo simulations, we tried to infer the turbulent state and the energy dissipation in the Earth's core. In the experiments, we found spontaneous reversals of the flow patterns of thermal convections within a certain range of the intensity of the magnetic fields and the Rayleigh numbers, which might be important to understand the origin of the geomagnetic field reversals.

开展了不同强度环境磁场下液态金属湍流热对流的室内实验。参考观测到的地磁场变化和地发电机模拟结果，我们试图推断地核的湍流状态和能量耗散。在实验中，我们发现在磁场强度和瑞利数一定范围内，热对流流动模式会自发反转，这对于理解地磁场反转的起源可能很重要。

项目成果

Organized flow structures of turbulent thermal convection in a liquid metal : oscillations and random reversals of flow pattern

液态金属中湍流热对流的组织流动结构：流动模式的振荡和随机反转

• 发表时间: 2011
• 作者: T. Yanagisawa;T. Miyagoshi;Y. Yamagishi;Y. Hamano;A. Sakuraba;Y. Tasaka;& Y. Takeda
• 通讯作者: & Y. Takeda

Experimental study of cell pattern formation induced by internal heat sources in a horizontal fluid layer

水平流体层内热源诱导细胞图案形成的实验研究

• 发表时间: 2010
• 期刊: Intl.J.Heat & Mass Trans. 53
• 作者: J.Takahashi

Dynamics of cell pattern formation in internally heated convection viewed from local to global particle image thermometry

从局部到全局粒子图像测温观察内部加热对流中细胞图案形成的动力学

• 发表时间: 2011
• 期刊: Proc.ASME-JSME-KSME Joint Fluids Eng.Conf.
• 作者: R.Abe;al
• 通讯作者: al

Large-scale flow and magnetic field structures in a low-viscosity geodynamo model : Effect of thermal boundary condition

低粘度地球发电机模型中的大尺度流动和磁场结构：热边界条件的影响

• 发表时间: 2009
• 作者: A.Tomiya;E.Takahashi N.Furukawa;T.Suzuki;A. Sakuraba
• 通讯作者: A. Sakuraba

MHD geodynamo model including effect of length-of-day variation

MHD 地球发电机模型，包括日长变化的影响

• 发表时间: 2011
• 作者: T.Miyagoshi;et al
• 通讯作者: et al