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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.

A modeling of pore structure in isotropic graphite for evaluation of outgassing phenomena.