Development of an Experimental Geophysical Fluid Dynamics Laboratory

实验地球物理流体动力学实验室的发展

• 批准号: 0236799
• 负责人: Jonathan Aurnou
• 金额: $ 17.88万
• 依托单位: University of California-Los Angeles
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2003
• 资助国家: 美国
• 起止时间: 2003-05-15 至 2006-04-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0236799&HistoricalAwards=false
• 关键词: Development; Experimental; Geophysical; Fluid; Dynamics

EAR-0236799AurnouThis proposal requests funds to develop essential instrumentation for a new experimental fluid dynamics laboratory in the Department of Earth and Space Sciences at UCLA. Using state-of-the-art techniques, experiments will provide detailed characterizations of flow dynamics at nearly planetary parameter values and will provide quantitative measurements of the flow fields that are believed to be critical components of the geodynamo. The quantitative results will test several long-held, but unproven, tenets regarding the dynamics of convection occurring in the deep Earth. The proposed instrumentation will utilize the recently developed technique of acoustic Doppler velocimetry to study convection in liquid metals that have material properties similar to that of the Earth's iron-rich outer core. The Doppler system will quantify convective velocities in a thermally-driven, large volume, plane layer rotating magnetoconvection tank. This set-up has the advantage of attaining an Elsasser number, the ratio of magnetic and rotational forces, that is close to one, as is estimated for the geodynamo. Quantitative measurements, including thermometry and Hall probe magnetometry in addition to velocimetry, will test accepted theories about how the Elsasser number may control convection in the core. This new instrumentation will provide a powerful, new platform for generating quantitative data relevant to the deep Earth and the geodynamo.***

EAR-0236799AURNOUTHIS提案要求资金为UCLA地球和太空科学系的新实验流体动力学实验室开发必不可少的仪器。使用最先进的技术，实验将在几乎行星参数值下提供流动动力学的详细特征，并将提供对流场的定量测量，这些测量被认为是Geodynamo的关键成分。定量结果将测试有关深地球中发生的对流动力学的多个长期以来但未经证实的宗旨。所提出的仪器将利用最近开发的声学多普勒速度法的技术来研究具有与地球富含铁的外部芯相似的材料特性的液体金属中的对流。多普勒系统将量化热驱动的大体积，平面旋转磁反射箱中的对流速度。 该设置的优点是达到Elsasser数，即磁力和旋转力的比率接近一个，如Geodynamo所估计。 定量测量值，包括测量法和霍尔探针磁力测定法，除了速度法之外，还将测试有关ELSASSER数量如何控制核心对流的公认理论。 这种新的仪器将为生成与深层和geodynamo相关的定量数据提供一个强大的新平台。***