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Extreme Magnetoconvection

极端磁对流

基本信息

批准号：
1803730
负责人：
Oleg Zikanov
金额：
$ 29.98万
依托单位：
Regents of the University of Michigan - Ann Arbor
依托单位国家：
美国
项目类别：
Standard Grant
财政年份：
2018
资助国家：
美国
起止时间：
2018-08-01 至 2022-07-31
项目状态：
已结题

来源：
https://www.nsf.gov/awardsearch/showAward?AWD_ID=1803730&HistoricalAwards=false
关键词：
Extreme Magnetoconvection

项目摘要

Thermal convection, i.e., a fluid flow in which hot fluid raises against gravity, is ubiquitous in nature and technology. Sometimes, the fluid is electrically conducting and moves in the presence of a magnetic field. For example, this happens in the outer core of the Earth, in processing of steel and aluminum, or growth of semiconductor crystals for electronics. Most closely related to the project are the examples from the two emerging energy technologies: nuclear fusion and energy storage in liquid metal batteries. The interaction with the magnetic field entirely changes the thermal convection. Unexpected patterns appear in the flow, such as strong internal jets, fluctuations of temperature with very high amplitude, spots of anomalously high or low temperature, and so on. The ability of the fluid to transport heat also changes dramatically. The project considers these effects in the case when both the convection and the magnetic field are very strong. Computer simulations are performed in cooperation with experiments conducted by project partners in the USA and Europe. The goals of the project are to understand the change of convection flow and to determine consequences for technology and nature.Thermal convection in an electrically conducting fluid (e.g., a liquid metal) in the presence of a magnetic field is analyzed computationally. The case of very large Grashof and Hartmann numbers is considered. It has been found recently that, as conventional turbulence is suppressed by the magnetic field, such flows acquire counter-intuitive extreme features, such as high-amplitude temperature fluctuations, anomalously strong convective heat transfer carried by quasi-two-dimensional jets, etc. The project applies high-resolution simulation approach in cooperation with experiments by research partners to understand the mechanisms of the flow modification and analyze the implications for emerging energy technologies, materials processing, and astro- and geophysical systems.This award reflects NSF's statutory mission and has been deemed worthy of support through evaluation using the Foundation's intellectual merit and broader impacts review criteria.

热对流，即，热流体克服重力上升的流体流动在自然界和技术中普遍存在。有时，流体是导电的，并且在磁场的存在下移动。例如，这发生在地球的外核，在钢和铝的加工过程中，或用于电子产品的半导体晶体的生长中。与该项目最密切相关的是两种新兴能源技术的例子：核聚变和液态金属电池储能。与磁场的相互作用完全改变了热对流。流动中会出现意想不到的模式，如强烈的内部射流、幅度很大的温度波动、温度过高或过低的斑点等，流体的传热能力也会发生显著变化。该项目在对流和磁场都很强的情况下考虑了这些影响。计算机模拟与美国和欧洲的项目合作伙伴进行的实验合作进行。该项目的目标是了解对流的变化，并确定对技术和自然的影响。导电流体中的热对流（例如，液态金属）在存在磁场的情况下进行计算分析。非常大的Grashof和Hartmann数的情况下被认为是。最近发现，由于磁场抑制了常规湍流，这种流动获得了与直觉相反的极端特征，例如高振幅温度波动，准二维射流携带的强烈对流换热，该项目适用于高-分辨率模拟方法与研究伙伴的实验合作，以了解流动修改的机制，并分析该奖项反映了NSF的法定使命，并通过使用基金会的知识价值和更广泛的影响审查标准进行评估，被认为值得支持。

项目成果

期刊论文数量（12）

专著数量（0）

科研奖励数量（0）

会议论文数量（0）

专利数量（0）

Mixed Convection in Pipe and Duct Flows With Strong Magnetic Fields

DOI：
10.1115/1.4049833
发表时间：
2021
期刊：
Applied Mechanics Reviews
影响因子：
14.3
作者：
O. Zikanov;I. Belyaev;Y. Listratov;P. Frick;N. Razuvanov;V. Sviridov
通讯作者：
O. Zikanov;I. Belyaev;Y. Listratov;P. Frick;N. Razuvanov;V. Sviridov

Transformation of a submerged flat jet under strong transverse magnetic field

强横向磁场下水下水平射流的变形

DOI：
10.1209/0295-5075/134/24003
发表时间：
2021
期刊：
EPL (Europhysics Letters
影响因子：
0
作者：
Krasnov, D.;Listratov, Ya.;Kolesnikov, Yu.;Belyaev, I.;Pyatnitskaya, N.;Sviridov, E.;Zikanov, O.
通讯作者：
Zikanov, O.

Rayleigh--Bénard convection in strong vertical magnetic field: flow structure and verification of numerical method

瑞利--强垂直磁场中的贝纳德对流：流动结构及数值方法验证