A Study of the Transition to Turbulence in a Bed of 67 Spherical Pebbles

IF 2 3区 工程技术 Q3 MECHANICS
David Reger, Elia Merzari, Tri Nguyen, Yu-Hsiang Lan, Paul Fischer, Yassin Hassan
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Abstract

Packed beds are commonly found in many engineering systems and have been widely studied for decades. A relatively new packed bed system is the Pebble Bed Reactor, a type of generation-IV nuclear reactor. Unlike many of the packed beds encountered in chemical and process engineering applications, Pebble Bed Reactors are larger and operate at significantly higher Reynolds numbers. As a result of these differences, there is a very limited amount of information on the detailed flow physics that exist in these complex geometries. This work seeks to contribute to a growing database of flow data for Pebble Bed Reactor systems by performing Direct Numerical Simulations of the flow in an experimental bed of 67 pebbles for a range of conditions. Simulations are performed at a Prandtl number of 0.66 and Reynolds numbers from 300–600. These Reynolds numbers are chosen to gain additional knowledge on the spatial development of turbulence in these systems. Analysis of the Turbulent Kinetic Energy, turbulence anisotropy, and Turbulent Heat Flux is performed. Results demonstrate significant development of the TKE across the tested range of Reynolds numbers. Examination of both the TKE and THF reveal that development first occurs near the center of the bed and propagates radially as the flow moves further into the bed. Notable regions of negative production of turbulent kinetic energy are observed in regions where flow accelerates around pebble contact points. These regions are found to coincide with regions of 1-component turbulence.Kindly check and confirm, all authors email id is correctly identified.These are correct

67个球形卵石床向湍流过渡的研究
填充床在许多工程系统中都很常见,并且已经被广泛研究了几十年。一个相对较新的填充床系统是卵石床反应堆,这是第四代核反应堆的一种。与化学和工艺工程应用中遇到的许多填充床不同,球床反应器更大,并且在更高的雷诺数下运行。由于这些差异,在这些复杂几何结构中存在的详细流动物理信息非常有限。这项工作旨在通过在一系列条件下对67个卵石的实验床上的流动进行直接数值模拟,为卵石床反应器系统的流动数据数据库做出贡献。模拟在普朗特数为0.66,雷诺数为300-600的条件下进行。选择这些雷诺数是为了获得关于这些系统中湍流空间发展的额外知识。对紊流动能、紊流各向异性和紊流热通量进行了分析。结果表明,在测试的雷诺数范围内,TKE有了显著的发展。对TKE和THF的检查表明,发展首先发生在床层中心附近,并随着流动进一步进入床层而呈径向传播。在卵石接触点附近流动加速的区域,观察到显著的紊流动能负产生区域。发现这些区域与单分量湍流区域重合。请检查并确认,所有作者的邮箱id都是正确识别的。这些都是正确的
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来源期刊
Flow, Turbulence and Combustion
Flow, Turbulence and Combustion 工程技术-力学
CiteScore
5.70
自引率
8.30%
发文量
72
审稿时长
2 months
期刊介绍: Flow, Turbulence and Combustion provides a global forum for the publication of original and innovative research results that contribute to the solution of fundamental and applied problems encountered in single-phase, multi-phase and reacting flows, in both idealized and real systems. The scope of coverage encompasses topics in fluid dynamics, scalar transport, multi-physics interactions and flow control. From time to time the journal publishes Special or Theme Issues featuring invited articles. Contributions may report research that falls within the broad spectrum of analytical, computational and experimental methods. This includes research conducted in academia, industry and a variety of environmental and geophysical sectors. Turbulence, transition and associated phenomena are expected to play a significant role in the majority of studies reported, although non-turbulent flows, typical of those in micro-devices, would be regarded as falling within the scope covered. The emphasis is on originality, timeliness, quality and thematic fit, as exemplified by the title of the journal and the qualifications described above. Relevance to real-world problems and industrial applications are regarded as strengths.
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