Investigation on Self-Diffusion of Fluid under Nanoconfinement Effect
When the distance between solid walls is only a few nanometers,the self-diffusion co-efficient of fluid is reduced by 1～2 orders of magnitude due to the nanoconfinement effect,and the effects of pore size,temperature and pressure are significant and complex.It is of great significance to analyze the diffusion mechanism and law of nanoconfined fluid and establish a concise correla-tion formula.In this study,a wide range of fluid self-diffusion coefficient data in nanopores were obtained through careful calculation and analysis based on molecular dynamics simulation.The mechanism and law of the adsorption effect on fluid diffusion were analyzed,and a novel dimen-sionless diffusion coefficient,which can simply describe the fluid diffusion behavior,was proposed,and the corresponding correlation formula was established with Knudsen number,which has strong applicability.
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