A method for the determination of local packing factor distribution of a packed pebble bed by the improved line-based averaging method

IF 1.9 3区工程技术 Q1 NUCLEAR SCIENCE & TECHNOLOGY

Fusion Engineering and Design Pub Date : 2024-09-10 DOI:10.1016/j.fusengdes.2024.114658

Baoping Gong, Hao Cheng, Juemin Yan, Long Zhang

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Abstract

The packing factor is an important parameter for describing the internal structural features in pebble beds, which have a significant influence on the heat and mass transfer behavior and the thermo-mechanical properties of the pebble bed. A comprehensive understanding of the packing structure is essential for the design and optimization of the pebble bed and can promote the application of the pebble bed. In this work, an improved line-based averaging method was proposed to calculate the local packing factor or local porosity distribution and validated by comparing the results with those obtained from experimental and numerical studies of cylindrical packed pebble bed. Furthermore, the local packing factor distributions in the angular-radial plane of the cylindrical pebble bed were revealed for the first time. In addition, the line-based averaging method has been applied to reveal the local packing factor distributions in the annular pebble beds, U-shaped pebble beds and hexagonal pebble beds. The main feature of this method is the ability to calculate and plot contour maps of local packing factor or porosity distributions for columnar pebble beds of arbitrary shapes, especially the local packing factor distributions in the cross-sectional plane and the angular-radial plane.

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一种利用改进的线性平均法确定堆积卵石床局部堆积因子分布的方法

填料系数是描述鹅卵石床内部结构特征的重要参数，对鹅卵石床的传热传质行为和热机械性能具有重要影响。全面了解填料结构对于卵石床的设计和优化至关重要，并能促进卵石床的应用。在这项工作中，提出了一种改进的基于线的平均方法来计算局部填料系数或局部孔隙率分布，并将计算结果与圆柱形填料卵石床的实验和数值研究结果进行了对比验证。此外，还首次揭示了圆柱形卵石床角径向平面上的局部堆积因子分布。此外，还应用线性平均法揭示了环形卵石床、U 形卵石床和六角形卵石床的局部堆积因子分布。该方法的主要特点是能够计算和绘制任意形状柱状卵石床的局部堆积因子或孔隙度分布等值线图，特别是横截面和角径向面上的局部堆积因子分布。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Fusion Engineering and Design 工程技术-核科学技术

CiteScore

3.50

自引率

23.50%

发文量

275

审稿时长

3.8 months

期刊介绍： The journal accepts papers about experiments (both plasma and technology), theory, models, methods, and designs in areas relating to technology, engineering, and applied science aspects of magnetic and inertial fusion energy. Specific areas of interest include: MFE and IFE design studies for experiments and reactors; fusion nuclear technologies and materials, including blankets and shields; analysis of reactor plasmas; plasma heating, fuelling, and vacuum systems; drivers, targets, and special technologies for IFE, controls and diagnostics; fuel cycle analysis and tritium reprocessing and handling; operations and remote maintenance of reactors; safety, decommissioning, and waste management; economic and environmental analysis of components and systems.