Laboratory Experiments on Thermo-Chemical Convection at High Rayleigh and Prandtl Numbers

高瑞利和普朗特数热化学对流的实验室实验

• 批准号: 9804904
• 负责人: Mark Richards
• 金额: $ 20.33万
• 依托单位: University of California-Berkeley
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 1998
• 资助国家: 美国
• 起止时间: 1998-07-01 至 2001-12-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9804904&HistoricalAwards=false
• 关键词: Laboratory; Experiments; Thermo; Chemical; Convection

9804904RichardsConvection in the mantles of terrestrial planets is extremely vigorous (high Rayleigh number), and it occurs with negligible influence from inertial forces (zero Reynolds number or infinite Prandtl number). Although modern computer models now approach this fluid dynamic regime, almost no relevant laboratory experiments have been performed. The P.I.'s propose to construct a very large tank to study convection at high Rayleigh and Prandtl numbers, using fluids with strong temperature-dependence of viscosity and differing densities to simulate a variety of processes considered important in the Earth's internal dynamics. These processes include mixing of various geochemical components by mantle convection, and the influence of convection on continental dynamics. They will employ new digital video imaging techniques to measure the flow and temperature fields in the tank, simultaneously producing a series of films illustrating the various fluid dynamic processes involved in mantle convection. They also propose to carry out direct comparisons of laboratory and numerical models of convection in order to provide much better experimental verification of results from large-scale computation.

9804904 Richards类地行星地幔中的对流是非常剧烈的（高瑞利数），它的发生与惯性力的影响可以忽略不计（零雷诺数或无限普朗特数）。 虽然现代计算机模型现在接近这种流体动力学制度，几乎没有相关的实验室实验已经进行。 私家侦探的建议，建立一个非常大的坦克研究对流在高瑞利和普朗特数，使用流体具有很强的温度依赖性的粘度和不同的密度，以模拟各种过程中被认为是重要的地球内部动力学。 这些过程包括地幔对流引起的各种地球化学成分的混合，以及地幔对流对大陆动力学的影响。他们将采用新的数字视频成像技术来测量罐中的流场和温度场，同时制作一系列电影，说明地幔对流中涉及的各种流体动力学过程。 他们还建议进行直接比较的实验室和数值模型的对流，以提供更好的实验验证结果从大规模计算。