A Modeling of Pore Structure in Isotropic Graphite for Evaluation of Outgassing Phenomena
A Modeling of Pore Structure in Isotropic Graphite for Evaluation of Outgassing Phenomena
复制标题
用于评估除气现象的各向同性石墨孔结构建模
DOI：
10.3131/jvsj.31.796
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发表时间：
1988
期刊：
影响因子：
--
通讯作者：
K. Akaishi
中科院分区：
文献类型：
--
作者：
K. Akaishi
通过假设多个开口毛细管在三维方向上等效分布，建立了石墨块体中孔结构的简单模型，以解析地描述多孔各向同性石墨样品的表面粗糙度因子和气体渗透率。在石墨孔隙结构模型中，定义了平均管径、平均管长和单位面积分布管的平均数密度。用导出的毛细管模型几何参数建立了描述表面粗糙度因子和气体渗透率的公式，然后用其他工作者对许多石墨样品的粗糙度因子和气体渗透率的实验数据数值地确定了这些参数。讨论了该模型在石墨材料放气性能评价中的有效性。
A simple modeling on Pore structure in graphite bulk is made by assuming that many number of open-ended capillary tubes are distributed equivalently for three dimensional directions, in order to describe analytically surface roughness factor and gas permeability of a porous isotropic graphite sample. In the model for the pore structure of the graphite, avarage tube diameter, avarage tube length and avarage number density of distributed tubes in unit area are defined. The formulation describing the surface roughness factor and the gas permeability is made with derived geometrical parameters for the capillary tube model, and then these parameters are determined numerically by using experimental data produced by other workers on roughness factors and gas permeabilities for many graphite samples. The validity of the model is discussed for evaluation of outgassing properties of graphite materials.