Analytical diffusion mechanism (ADiM) model combining specular, Knudsen and surface diffusion

Aaron William Thornton, Afsana Ahmed, Sridhar Kumar Kannam, Billy D Todd, Mainak Majumder, Anita J Hill

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Abstract

We present a unified transport model that combines specular, Knudsen and surface
diffusion mechanisms, termed the Analytical Diffusion Mechanism (ADiM) model. The ADiM model uniquely describes the transport behaviour of the bulk gas and adsorbed phase taking place in rough and smooth nanopores. Experiments and molecular simulations of nitrogen flow through aligned nanotube-based membranes are used to verify the model. In addition, we explore entrance effects using a suction energy mechanism that is compatible with ADiM and can accelerate gas permeance by an order of magnitude. Finally, ADiM is used to assess the effect of tube size on postcombustion carbon dioxide separation from fossil fuel plants.
Original languageEnglish
Pages (from-to)1 - 9
Number of pages9
JournalJournal of Membrane Science
Volume485
DOIs
Publication statusPublished - 2015

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