.png){kind=icon}
返回
Time-dependent neutron diffusion coefficient for the effective diffusion equation
.png){kind=icon}
PRE
AI
DOI：10.1016/j.pnucene.2018.12.003.png)
.png){kind=icon}
原文求助.png){kind=icon}
分享.png){kind=icon}
收藏
摘要
En 中文
The time-dependency of neutron diffusion coefficient as well as neutronic interfacial coefficients in nuclear reactors at short time-scale is investigated via the volume averaging method. The boundary-value problems of governing differential equation for spatial deviations around averages of local variables are developed in this work. The general solution of spatial deviations-boundary-value problem allows closing the up-scaled neutron diffusion equation, which incorporates new terms with respect to classic equation. Meanwhile, the particular solutions of spatial deviations enable the numerical estimation of effective diffusion and neutronic interfacial coefficients. The geometrical domains where effective coefficients were numerically computed include 2D and 3D unit cells, which are representative geometries for two types of nuclear reactors: conventional arrangements with fuel rods and pebble bed. The numerical estimations were fitted to an analytical expression as function of time. The numerical solution of up-scaled model and comparison with results of direct numerical simulations are presented and discussed in this work.
Keyword:
Neutron diffusion
Neutron diffusion coefficient
Scaling method
Volume-average neutron diffusion equation
Transient closure relationships
Direct numerical simulation
AI总结
对已上传原文的论文进行重点信息的提取，主要内容包括：简要概述、研究摘要、背景介绍、关键亮点、图文解析、展望与总结。
期刊
IF:
3.2
论文数:
5.6K
被引数:
10.0K
机构
引用论文
A comparative review of upscaling methods for solute transport in heterogeneous porous media.png)
JOURNAL OF HYDROLOGY
JOURNAL OF HYDROLOGYIF6.3
PREAI
分享收藏The longitudinal dispersion coefficient of soils as related to the variability of local permeability
PREAI
分享收藏分享收藏
查看更多内容