Knudsen diffusivities and properties of structures of unidirectional fibers

摘要: Effective Knudsen diffusion coefficients are presented for fibrous structures consisting of parallel, nonoverlapping or partially overlapping fibers. They computed by means a Monte Carlo simulation scheme which is employed to determine the mean square displacement molecules travelling in interior porous medium large travel times. The results show that paralle, non-overlapping fibers have smaller effective parallel than randomly same porosity and fiber radius, but larger directions perpendicular Partially found exhibit behavior intermediate those two extreme cases. Molecular trajectory computations also used obtain structural properties (e.g., internal surface area, accessible percolation threshold), compared with some literature equivalent problem disks on plane.