J054022 多孔質体内のナノスケール気体流れに関する数値的研究([J05402]マイクロ・ナノスケールの熱流体現象(2))

Abstract

In porous media with holes as small as a molecular mean free path, Knudsen number of gas flow in the narrow channel is in the order of unity. Therefore, the direct simulation Monte Carlo (DSMC) method is suitable to solve the transport phenomena in porous media. However, even if the inside structures of porous media are measured transparently by microscopy technique such as 3D transmission electron microscopy (3D TEM), geometries obtained will be discrete. Moreover, performing DSMC simulation for nanoscale gas flow in porous media is difficult because of its complicated structure. Therefore, we need to estimate and simplify the real shapes of complicated channels inside porous media. In this work, we propose two schemes for estimation and simplification of solid bodies in porous media. In the first scheme, we simplify them as aggregations of cubes. In the second scheme, we simplify them as aggregations of polyhedra. We put cubes or polyhedra based on the discrete information of solid bodies in porous media. We examine merits and demerits of these schemes by performing numerical simulations of example problems.