期刊
JOURNAL OF AEROSOL SCIENCE
卷 155, 期 -, 页码 -出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.jaerosci.2021.105774
关键词
High-temperature gas-cooled reactor; Graphite dust; Terminal settling velocity; Drag coefficient; Stokes law
类别
资金
- National Natural Science Foundation of China [51776109]
- LingChuang Research Project of China National Nuclear Corporation
- National ST Major Project [ZX06901]
- Tsinghua University Scientific Research Fund [20151080381]
The experimental investigation on the free settling of micrometer-sized graphite particles showed that the drag coefficient of the particles still follows the form of Stokes law and scales inversely proportional to the particle Reynolds number. A new correlation for the drag coefficient was proposed and the Bagheri and Bonadonna's correlation was found to well represent the drag coefficient of graphite particles in a wide range of particle Reynolds number.
Micrometer-sized graphite particles are widely found in nature and industry. Particularly, the graphite dust is an important problem for the pebble-bed high temperature gas-cooled reactor (HTGR), regarding the coupling with the fission products (FPs). Due to the highly irregular disklike shape, a great gap still exists for understanding the transport-related behaviors of real graphite particles, including the settling velocity and drag coefficient. To address this issue, we present an experimental investigation on the free settling of micrometer-sized natural, IG-110, NG-CT-10 and A3-3 graphite particles. The steady settling process is filmed using a high-speed camera together with a microscope. Both the terminal settling velocity and the drag coefficient are measured. In the Stokes region, although the shape is highly irregular and diverse, the statistical results show that the drag coefficient still follows the form of Stokes law and scales inversely proportional to the particle Reynolds number. Adopting the Stokes form and modifying the coefficient, a new correlation is proposed for the drag coefficient. The fitted value is 30.7 +/- 10.2 for natural graphite, 26.2 +/- 7.5 for IG-110, 28.1 +/- 8.4 for NG-CT-10 and 32.7 +/- 8.3 for A3-3 particles, which are larger than 24 of the classical spherical Stokes solution. In a wide range of particle Reynolds number from 10-4 to 3, the Bagheri and Bonadonna's correlation well represents the drag coefficient of graphite particles. The results of this work can be easily incorporated into Eulerian-Lagrangian simulations and aerosol models in system analysis codes, and helps to improve the understanding and modelling of irregular disk-like graphite particles.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据